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 // Copyright 2005, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // The Google C++ Testing and Mocking Framework (Google Test)
 //
 // This header file defines the public API for Google Test.  It should be
 // included by any test program that uses Google Test.
 //
 // IMPORTANT NOTE: Due to limitation of the C++ language, we have to
 // leave some internal implementation details in this header file.
 // They are clearly marked by comments like this:
 //
 //   // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 //
 // Such code is NOT meant to be used by a user directly, and is subject
 // to CHANGE WITHOUT NOTICE.  Therefore DO NOT DEPEND ON IT in a user
 // program!
 //
 // Acknowledgment: Google Test borrowed the idea of automatic test
 // registration from Barthelemy Dagenais' (barthelemy@prologique.com)
 // easyUnit framework.
 
 #ifndef GOOGLETEST_INCLUDE_GTEST_GTEST_H_
 #define GOOGLETEST_INCLUDE_GTEST_GTEST_H_
 
 #include <cstddef>
 #include <limits>
 #include <memory>
 #include <ostream>
 #include <type_traits>
 #include <vector>
 
 #include "gtest/gtest-assertion-result.h"
 #include "gtest/gtest-death-test.h"
 #include "gtest/gtest-matchers.h"
 #include "gtest/gtest-message.h"
 #include "gtest/gtest-param-test.h"
 #include "gtest/gtest-printers.h"
 #include "gtest/gtest-test-part.h"
 #include "gtest/gtest-typed-test.h"
 #include "gtest/gtest_pred_impl.h"
 #include "gtest/gtest_prod.h"
 #include "gtest/internal/gtest-internal.h"
 #include "gtest/internal/gtest-string.h"
 
 GTEST_DISABLE_MSC_WARNINGS_PUSH_(4251 \
 /* class A needs to have dll-interface to be used by clients of class B */)
 
 // Declares the flags.
 
 // This flag temporary enables the disabled tests.
 GTEST_DECLARE_bool_(also_run_disabled_tests);
 
 // This flag brings the debugger on an assertion failure.
 GTEST_DECLARE_bool_(break_on_failure);
 
 // This flag controls whether Google Test catches all test-thrown exceptions
 // and logs them as failures.
 GTEST_DECLARE_bool_(catch_exceptions);
 
 // This flag enables using colors in terminal output. Available values are
 // "yes" to enable colors, "no" (disable colors), or "auto" (the default)
 // to let Google Test decide.
 GTEST_DECLARE_string_(color);
 
 // This flag controls whether the test runner should continue execution past
 // first failure.
 GTEST_DECLARE_bool_(fail_fast);
 
 // This flag sets up the filter to select by name using a glob pattern
 // the tests to run. If the filter is not given all tests are executed.
 GTEST_DECLARE_string_(filter);
 
 // This flag controls whether Google Test installs a signal handler that dumps
 // debugging information when fatal signals are raised.
 GTEST_DECLARE_bool_(install_failure_signal_handler);
 
 // This flag causes the Google Test to list tests. None of the tests listed
 // are actually run if the flag is provided.
 GTEST_DECLARE_bool_(list_tests);
 
 // This flag controls whether Google Test emits a detailed XML report to a file
 // in addition to its normal textual output.
 GTEST_DECLARE_string_(output);
 
 // This flags control whether Google Test prints only test failures.
 GTEST_DECLARE_bool_(brief);
 
 // This flags control whether Google Test prints the elapsed time for each
 // test.
 GTEST_DECLARE_bool_(print_time);
 
 // This flags control whether Google Test prints UTF8 characters as text.
 GTEST_DECLARE_bool_(print_utf8);
 
 // This flag specifies the random number seed.
 GTEST_DECLARE_int32_(random_seed);
 
 // This flag sets how many times the tests are repeated. The default value
 // is 1. If the value is -1 the tests are repeating forever.
 GTEST_DECLARE_int32_(repeat);
 
 // This flag controls whether Google Test Environments are recreated for each
 // repeat of the tests. The default value is true. If set to false the global
 // test Environment objects are only set up once, for the first iteration, and
 // only torn down once, for the last.
 GTEST_DECLARE_bool_(recreate_environments_when_repeating);
 
 // This flag controls whether Google Test includes Google Test internal
 // stack frames in failure stack traces.
 GTEST_DECLARE_bool_(show_internal_stack_frames);
 
 // When this flag is specified, tests' order is randomized on every iteration.
 GTEST_DECLARE_bool_(shuffle);
 
 // This flag specifies the maximum number of stack frames to be
 // printed in a failure message.
 GTEST_DECLARE_int32_(stack_trace_depth);
 
 // When this flag is specified, a failed assertion will throw an
 // exception if exceptions are enabled, or exit the program with a
 // non-zero code otherwise. For use with an external test framework.
 GTEST_DECLARE_bool_(throw_on_failure);
 
 // When this flag is set with a "host:port" string, on supported
 // platforms test results are streamed to the specified port on
 // the specified host machine.
 GTEST_DECLARE_string_(stream_result_to);
 
 #if GTEST_USE_OWN_FLAGFILE_FLAG_
 GTEST_DECLARE_string_(flagfile);
 #endif  // GTEST_USE_OWN_FLAGFILE_FLAG_
 
 namespace testing {
 
 // Silence C4100 (unreferenced formal parameter) and 4805
 // unsafe mix of type 'const int' and type 'const bool'
 #ifdef _MSC_VER
 #pragma warning(push)
 #pragma warning(disable : 4805)
 #pragma warning(disable : 4100)
 #endif
 
 // The upper limit for valid stack trace depths.
 const int kMaxStackTraceDepth = 100;
 
 namespace internal {
 
 class AssertHelper;
 class DefaultGlobalTestPartResultReporter;
 class ExecDeathTest;
 class NoExecDeathTest;
 class FinalSuccessChecker;
 class GTestFlagSaver;
 class StreamingListenerTest;
 class TestResultAccessor;
 class TestEventListenersAccessor;
 class TestEventRepeater;
 class UnitTestRecordPropertyTestHelper;
 class WindowsDeathTest;
 class FuchsiaDeathTest;
 class UnitTestImpl* GetUnitTestImpl();
 void ReportFailureInUnknownLocation(TestPartResult::Type result_type,
                                     const std::string& message);
 std::set<std::string>* GetIgnoredParameterizedTestSuites();
 
 }  // namespace internal
 
 // The friend relationship of some of these classes is cyclic.
 // If we don't forward declare them the compiler might confuse the classes
 // in friendship clauses with same named classes on the scope.
 class Test;
 class TestSuite;
 
 // Old API is still available but deprecated
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 using TestCase = TestSuite;
 #endif
 class TestInfo;
 class UnitTest;
 
 // The abstract class that all tests inherit from.
 //
 // In Google Test, a unit test program contains one or many TestSuites, and
 // each TestSuite contains one or many Tests.
 //
 // When you define a test using the TEST macro, you don't need to
 // explicitly derive from Test - the TEST macro automatically does
 // this for you.
 //
 // The only time you derive from Test is when defining a test fixture
 // to be used in a TEST_F.  For example:
 //
 //   class FooTest : public testing::Test {
 //    protected:
 //     void SetUp() override { ... }
 //     void TearDown() override { ... }
 //     ...
 //   };
 //
 //   TEST_F(FooTest, Bar) { ... }
 //   TEST_F(FooTest, Baz) { ... }
 //
 // Test is not copyable.
 class GTEST_API_ Test {
  public:
   friend class TestInfo;
 
   // The d'tor is virtual as we intend to inherit from Test.
   virtual ~Test();
 
   // Sets up the stuff shared by all tests in this test suite.
   //
   // Google Test will call Foo::SetUpTestSuite() before running the first
   // test in test suite Foo.  Hence a sub-class can define its own
   // SetUpTestSuite() method to shadow the one defined in the super
   // class.
   static void SetUpTestSuite() {}
 
   // Tears down the stuff shared by all tests in this test suite.
   //
   // Google Test will call Foo::TearDownTestSuite() after running the last
   // test in test suite Foo.  Hence a sub-class can define its own
   // TearDownTestSuite() method to shadow the one defined in the super
   // class.
   static void TearDownTestSuite() {}
 
   // Legacy API is deprecated but still available. Use SetUpTestSuite and
   // TearDownTestSuite instead.
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   static void TearDownTestCase() {}
   static void SetUpTestCase() {}
 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   // Returns true if and only if the current test has a fatal failure.
   static bool HasFatalFailure();
 
   // Returns true if and only if the current test has a non-fatal failure.
   static bool HasNonfatalFailure();
 
   // Returns true if and only if the current test was skipped.
   static bool IsSkipped();
 
   // Returns true if and only if the current test has a (either fatal or
   // non-fatal) failure.
   static bool HasFailure() { return HasFatalFailure() || HasNonfatalFailure(); }
 
   // Logs a property for the current test, test suite, or for the entire
   // invocation of the test program when used outside of the context of a
   // test suite.  Only the last value for a given key is remembered.  These
   // are public static so they can be called from utility functions that are
   // not members of the test fixture.  Calls to RecordProperty made during
   // lifespan of the test (from the moment its constructor starts to the
   // moment its destructor finishes) will be output in XML as attributes of
   // the <testcase> element.  Properties recorded from fixture's
   // SetUpTestSuite or TearDownTestSuite are logged as attributes of the
   // corresponding <testsuite> element.  Calls to RecordProperty made in the
   // global context (before or after invocation of RUN_ALL_TESTS and from
   // SetUp/TearDown method of Environment objects registered with Google
   // Test) will be output as attributes of the <testsuites> element.
   static void RecordProperty(const std::string& key, const std::string& value);
   static void RecordProperty(const std::string& key, int value);
 
  protected:
   // Creates a Test object.
   Test();
 
   // Sets up the test fixture.
   virtual void SetUp();
 
   // Tears down the test fixture.
   virtual void TearDown();
 
  private:
   // Returns true if and only if the current test has the same fixture class
   // as the first test in the current test suite.
   static bool HasSameFixtureClass();
 
   // Runs the test after the test fixture has been set up.
   //
   // A sub-class must implement this to define the test logic.
   //
   // DO NOT OVERRIDE THIS FUNCTION DIRECTLY IN A USER PROGRAM.
   // Instead, use the TEST or TEST_F macro.
   virtual void TestBody() = 0;
 
   // Sets up, executes, and tears down the test.
   void Run();
 
   // Deletes self.  We deliberately pick an unusual name for this
   // internal method to avoid clashing with names used in user TESTs.
   void DeleteSelf_() { delete this; }
 
   const std::unique_ptr<GTEST_FLAG_SAVER_> gtest_flag_saver_;
 
   // Often a user misspells SetUp() as Setup() and spends a long time
   // wondering why it is never called by Google Test.  The declaration of
   // the following method is solely for catching such an error at
   // compile time:
   //
   //   - The return type is deliberately chosen to be not void, so it
   //   will be a conflict if void Setup() is declared in the user's
   //   test fixture.
   //
   //   - This method is private, so it will be another compiler error
   //   if the method is called from the user's test fixture.
   //
   // DO NOT OVERRIDE THIS FUNCTION.
   //
   // If you see an error about overriding the following function or
   // about it being private, you have mis-spelled SetUp() as Setup().
   struct Setup_should_be_spelled_SetUp {};
   virtual Setup_should_be_spelled_SetUp* Setup() { return nullptr; }
 
   // We disallow copying Tests.
   Test(const Test&) = delete;
   Test& operator=(const Test&) = delete;
 };
 
 typedef internal::TimeInMillis TimeInMillis;
 
 // A copyable object representing a user specified test property which can be
 // output as a key/value string pair.
 //
 // Don't inherit from TestProperty as its destructor is not virtual.
 class TestProperty {
  public:
   // C'tor.  TestProperty does NOT have a default constructor.
   // Always use this constructor (with parameters) to create a
   // TestProperty object.
   TestProperty(const std::string& a_key, const std::string& a_value)
       : key_(a_key), value_(a_value) {}
 
   // Gets the user supplied key.
   const char* key() const { return key_.c_str(); }
 
   // Gets the user supplied value.
   const char* value() const { return value_.c_str(); }
 
   // Sets a new value, overriding the one supplied in the constructor.
   void SetValue(const std::string& new_value) { value_ = new_value; }
 
  private:
   // The key supplied by the user.
   std::string key_;
   // The value supplied by the user.
   std::string value_;
 };
 
 // The result of a single Test.  This includes a list of
 // TestPartResults, a list of TestProperties, a count of how many
 // death tests there are in the Test, and how much time it took to run
 // the Test.
 //
 // TestResult is not copyable.
 class GTEST_API_ TestResult {
  public:
   // Creates an empty TestResult.
   TestResult();
 
   // D'tor.  Do not inherit from TestResult.
   ~TestResult();
 
   // Gets the number of all test parts.  This is the sum of the number
   // of successful test parts and the number of failed test parts.
   int total_part_count() const;
 
   // Returns the number of the test properties.
   int test_property_count() const;
 
   // Returns true if and only if the test passed (i.e. no test part failed).
   bool Passed() const { return !Skipped() && !Failed(); }
 
   // Returns true if and only if the test was skipped.
   bool Skipped() const;
 
   // Returns true if and only if the test failed.
   bool Failed() const;
 
   // Returns true if and only if the test fatally failed.
   bool HasFatalFailure() const;
 
   // Returns true if and only if the test has a non-fatal failure.
   bool HasNonfatalFailure() const;
 
   // Returns the elapsed time, in milliseconds.
   TimeInMillis elapsed_time() const { return elapsed_time_; }
 
   // Gets the time of the test case start, in ms from the start of the
   // UNIX epoch.
   TimeInMillis start_timestamp() const { return start_timestamp_; }
 
   // Returns the i-th test part result among all the results. i can range from 0
   // to total_part_count() - 1. If i is not in that range, aborts the program.
   const TestPartResult& GetTestPartResult(int i) const;
 
   // Returns the i-th test property. i can range from 0 to
   // test_property_count() - 1. If i is not in that range, aborts the
   // program.
   const TestProperty& GetTestProperty(int i) const;
 
  private:
   friend class TestInfo;
   friend class TestSuite;
   friend class UnitTest;
   friend class internal::DefaultGlobalTestPartResultReporter;
   friend class internal::ExecDeathTest;
   friend class internal::TestResultAccessor;
   friend class internal::UnitTestImpl;
   friend class internal::WindowsDeathTest;
   friend class internal::FuchsiaDeathTest;
 
   // Gets the vector of TestPartResults.
   const std::vector<TestPartResult>& test_part_results() const {
     return test_part_results_;
   }
 
   // Gets the vector of TestProperties.
   const std::vector<TestProperty>& test_properties() const {
     return test_properties_;
   }
 
   // Sets the start time.
   void set_start_timestamp(TimeInMillis start) { start_timestamp_ = start; }
 
   // Sets the elapsed time.
   void set_elapsed_time(TimeInMillis elapsed) { elapsed_time_ = elapsed; }
 
   // Adds a test property to the list. The property is validated and may add
   // a non-fatal failure if invalid (e.g., if it conflicts with reserved
   // key names). If a property is already recorded for the same key, the
   // value will be updated, rather than storing multiple values for the same
   // key.  xml_element specifies the element for which the property is being
   // recorded and is used for validation.
   void RecordProperty(const std::string& xml_element,
                       const TestProperty& test_property);
 
   // Adds a failure if the key is a reserved attribute of Google Test
   // testsuite tags.  Returns true if the property is valid.
   // FIXME: Validate attribute names are legal and human readable.
   static bool ValidateTestProperty(const std::string& xml_element,
                                    const TestProperty& test_property);
 
   // Adds a test part result to the list.
   void AddTestPartResult(const TestPartResult& test_part_result);
 
   // Returns the death test count.
   int death_test_count() const { return death_test_count_; }
 
   // Increments the death test count, returning the new count.
   int increment_death_test_count() { return ++death_test_count_; }
 
   // Clears the test part results.
   void ClearTestPartResults();
 
   // Clears the object.
   void Clear();
 
   // Protects mutable state of the property vector and of owned
   // properties, whose values may be updated.
   internal::Mutex test_properties_mutex_;
 
   // The vector of TestPartResults
   std::vector<TestPartResult> test_part_results_;
   // The vector of TestProperties
   std::vector<TestProperty> test_properties_;
   // Running count of death tests.
   int death_test_count_;
   // The start time, in milliseconds since UNIX Epoch.
   TimeInMillis start_timestamp_;
   // The elapsed time, in milliseconds.
   TimeInMillis elapsed_time_;
 
   // We disallow copying TestResult.
   TestResult(const TestResult&) = delete;
   TestResult& operator=(const TestResult&) = delete;
 };  // class TestResult
 
 // A TestInfo object stores the following information about a test:
 //
 //   Test suite name
 //   Test name
 //   Whether the test should be run
 //   A function pointer that creates the test object when invoked
 //   Test result
 //
 // The constructor of TestInfo registers itself with the UnitTest
 // singleton such that the RUN_ALL_TESTS() macro knows which tests to
 // run.
 class GTEST_API_ TestInfo {
  public:
   // Destructs a TestInfo object.  This function is not virtual, so
   // don't inherit from TestInfo.
   ~TestInfo();
 
   // Returns the test suite name.
   const char* test_suite_name() const { return test_suite_name_.c_str(); }
 
 // Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   const char* test_case_name() const { return test_suite_name(); }
 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   // Returns the test name.
   const char* name() const { return name_.c_str(); }
 
   // Returns the name of the parameter type, or NULL if this is not a typed
   // or a type-parameterized test.
   const char* type_param() const {
     if (type_param_.get() != nullptr) return type_param_->c_str();
     return nullptr;
   }
 
   // Returns the text representation of the value parameter, or NULL if this
   // is not a value-parameterized test.
   const char* value_param() const {
     if (value_param_.get() != nullptr) return value_param_->c_str();
     return nullptr;
   }
 
   // Returns the file name where this test is defined.
   const char* file() const { return location_.file.c_str(); }
 
   // Returns the line where this test is defined.
   int line() const { return location_.line; }
 
   // Return true if this test should not be run because it's in another shard.
   bool is_in_another_shard() const { return is_in_another_shard_; }
 
   // Returns true if this test should run, that is if the test is not
   // disabled (or it is disabled but the also_run_disabled_tests flag has
   // been specified) and its full name matches the user-specified filter.
   //
   // Google Test allows the user to filter the tests by their full names.
   // The full name of a test Bar in test suite Foo is defined as
   // "Foo.Bar".  Only the tests that match the filter will run.
   //
   // A filter is a colon-separated list of glob (not regex) patterns,
   // optionally followed by a '-' and a colon-separated list of
   // negative patterns (tests to exclude).  A test is run if it
   // matches one of the positive patterns and does not match any of
   // the negative patterns.
   //
   // For example, *A*:Foo.* is a filter that matches any string that
   // contains the character 'A' or starts with "Foo.".
   bool should_run() const { return should_run_; }
 
   // Returns true if and only if this test will appear in the XML report.
   bool is_reportable() const {
     // The XML report includes tests matching the filter, excluding those
     // run in other shards.
     return matches_filter_ && !is_in_another_shard_;
   }
 
   // Returns the result of the test.
   const TestResult* result() const { return &result_; }
 
  private:
 #if GTEST_HAS_DEATH_TEST
   friend class internal::DefaultDeathTestFactory;
 #endif  // GTEST_HAS_DEATH_TEST
   friend class Test;
   friend class TestSuite;
   friend class internal::UnitTestImpl;
   friend class internal::StreamingListenerTest;
   friend TestInfo* internal::MakeAndRegisterTestInfo(
       const char* test_suite_name, const char* name, const char* type_param,
       const char* value_param, internal::CodeLocation code_location,
       internal::TypeId fixture_class_id, internal::SetUpTestSuiteFunc set_up_tc,
       internal::TearDownTestSuiteFunc tear_down_tc,
       internal::TestFactoryBase* factory);
 
   // Constructs a TestInfo object. The newly constructed instance assumes
   // ownership of the factory object.
   TestInfo(const std::string& test_suite_name, const std::string& name,
            const char* a_type_param,   // NULL if not a type-parameterized test
            const char* a_value_param,  // NULL if not a value-parameterized test
            internal::CodeLocation a_code_location,
            internal::TypeId fixture_class_id,
            internal::TestFactoryBase* factory);
 
   // Increments the number of death tests encountered in this test so
   // far.
   int increment_death_test_count() {
     return result_.increment_death_test_count();
   }
 
   // Creates the test object, runs it, records its result, and then
   // deletes it.
   void Run();
 
   // Skip and records the test result for this object.
   void Skip();
 
   static void ClearTestResult(TestInfo* test_info) {
     test_info->result_.Clear();
   }
 
   // These fields are immutable properties of the test.
   const std::string test_suite_name_;  // test suite name
   const std::string name_;             // Test name
   // Name of the parameter type, or NULL if this is not a typed or a
   // type-parameterized test.
   const std::unique_ptr<const ::std::string> type_param_;
   // Text representation of the value parameter, or NULL if this is not a
   // value-parameterized test.
   const std::unique_ptr<const ::std::string> value_param_;
   internal::CodeLocation location_;
   const internal::TypeId fixture_class_id_;  // ID of the test fixture class
   bool should_run_;           // True if and only if this test should run
   bool is_disabled_;          // True if and only if this test is disabled
   bool matches_filter_;       // True if this test matches the
                               // user-specified filter.
   bool is_in_another_shard_;  // Will be run in another shard.
   internal::TestFactoryBase* const factory_;  // The factory that creates
                                               // the test object
 
   // This field is mutable and needs to be reset before running the
   // test for the second time.
   TestResult result_;
 
   TestInfo(const TestInfo&) = delete;
   TestInfo& operator=(const TestInfo&) = delete;
 };
 
 // A test suite, which consists of a vector of TestInfos.
 //
 // TestSuite is not copyable.
 class GTEST_API_ TestSuite {
  public:
   // Creates a TestSuite with the given name.
   //
   // TestSuite does NOT have a default constructor.  Always use this
   // constructor to create a TestSuite object.
   //
   // Arguments:
   //
   //   name:         name of the test suite
   //   a_type_param: the name of the test's type parameter, or NULL if
   //                 this is not a type-parameterized test.
   //   set_up_tc:    pointer to the function that sets up the test suite
   //   tear_down_tc: pointer to the function that tears down the test suite
   TestSuite(const char* name, const char* a_type_param,
             internal::SetUpTestSuiteFunc set_up_tc,
             internal::TearDownTestSuiteFunc tear_down_tc);
 
   // Destructor of TestSuite.
   virtual ~TestSuite();
 
   // Gets the name of the TestSuite.
   const char* name() const { return name_.c_str(); }
 
   // Returns the name of the parameter type, or NULL if this is not a
   // type-parameterized test suite.
   const char* type_param() const {
     if (type_param_.get() != nullptr) return type_param_->c_str();
     return nullptr;
   }
 
   // Returns true if any test in this test suite should run.
   bool should_run() const { return should_run_; }
 
   // Gets the number of successful tests in this test suite.
   int successful_test_count() const;
 
   // Gets the number of skipped tests in this test suite.
   int skipped_test_count() const;
 
   // Gets the number of failed tests in this test suite.
   int failed_test_count() const;
 
   // Gets the number of disabled tests that will be reported in the XML report.
   int reportable_disabled_test_count() const;
 
   // Gets the number of disabled tests in this test suite.
   int disabled_test_count() const;
 
   // Gets the number of tests to be printed in the XML report.
   int reportable_test_count() const;
 
   // Get the number of tests in this test suite that should run.
   int test_to_run_count() const;
 
   // Gets the number of all tests in this test suite.
   int total_test_count() const;
 
   // Returns true if and only if the test suite passed.
   bool Passed() const { return !Failed(); }
 
   // Returns true if and only if the test suite failed.
   bool Failed() const {
     return failed_test_count() > 0 || ad_hoc_test_result().Failed();
   }
 
   // Returns the elapsed time, in milliseconds.
   TimeInMillis elapsed_time() const { return elapsed_time_; }
 
   // Gets the time of the test suite start, in ms from the start of the
   // UNIX epoch.
   TimeInMillis start_timestamp() const { return start_timestamp_; }
 
   // Returns the i-th test among all the tests. i can range from 0 to
   // total_test_count() - 1. If i is not in that range, returns NULL.
   const TestInfo* GetTestInfo(int i) const;
 
   // Returns the TestResult that holds test properties recorded during
   // execution of SetUpTestSuite and TearDownTestSuite.
   const TestResult& ad_hoc_test_result() const { return ad_hoc_test_result_; }
 
  private:
   friend class Test;
   friend class internal::UnitTestImpl;
 
   // Gets the (mutable) vector of TestInfos in this TestSuite.
   std::vector<TestInfo*>& test_info_list() { return test_info_list_; }
 
   // Gets the (immutable) vector of TestInfos in this TestSuite.
   const std::vector<TestInfo*>& test_info_list() const {
     return test_info_list_;
   }
 
   // Returns the i-th test among all the tests. i can range from 0 to
   // total_test_count() - 1. If i is not in that range, returns NULL.
   TestInfo* GetMutableTestInfo(int i);
 
   // Sets the should_run member.
   void set_should_run(bool should) { should_run_ = should; }
 
   // Adds a TestInfo to this test suite.  Will delete the TestInfo upon
   // destruction of the TestSuite object.
   void AddTestInfo(TestInfo* test_info);
 
   // Clears the results of all tests in this test suite.
   void ClearResult();
 
   // Clears the results of all tests in the given test suite.
   static void ClearTestSuiteResult(TestSuite* test_suite) {
     test_suite->ClearResult();
   }
 
   // Runs every test in this TestSuite.
   void Run();
 
   // Skips the execution of tests under this TestSuite
   void Skip();
 
   // Runs SetUpTestSuite() for this TestSuite.  This wrapper is needed
   // for catching exceptions thrown from SetUpTestSuite().
   void RunSetUpTestSuite() {
     if (set_up_tc_ != nullptr) {
       (*set_up_tc_)();
     }
   }
 
   // Runs TearDownTestSuite() for this TestSuite.  This wrapper is
   // needed for catching exceptions thrown from TearDownTestSuite().
   void RunTearDownTestSuite() {
     if (tear_down_tc_ != nullptr) {
       (*tear_down_tc_)();
     }
   }
 
   // Returns true if and only if test passed.
   static bool TestPassed(const TestInfo* test_info) {
     return test_info->should_run() && test_info->result()->Passed();
   }
 
   // Returns true if and only if test skipped.
   static bool TestSkipped(const TestInfo* test_info) {
     return test_info->should_run() && test_info->result()->Skipped();
   }
 
   // Returns true if and only if test failed.
   static bool TestFailed(const TestInfo* test_info) {
     return test_info->should_run() && test_info->result()->Failed();
   }
 
   // Returns true if and only if the test is disabled and will be reported in
   // the XML report.
   static bool TestReportableDisabled(const TestInfo* test_info) {
     return test_info->is_reportable() && test_info->is_disabled_;
   }
 
   // Returns true if and only if test is disabled.
   static bool TestDisabled(const TestInfo* test_info) {
     return test_info->is_disabled_;
   }
 
   // Returns true if and only if this test will appear in the XML report.
   static bool TestReportable(const TestInfo* test_info) {
     return test_info->is_reportable();
   }
 
   // Returns true if the given test should run.
   static bool ShouldRunTest(const TestInfo* test_info) {
     return test_info->should_run();
   }
 
   // Shuffles the tests in this test suite.
   void ShuffleTests(internal::Random* random);
 
   // Restores the test order to before the first shuffle.
   void UnshuffleTests();
 
   // Name of the test suite.
   std::string name_;
   // Name of the parameter type, or NULL if this is not a typed or a
   // type-parameterized test.
   const std::unique_ptr<const ::std::string> type_param_;
   // The vector of TestInfos in their original order.  It owns the
   // elements in the vector.
   std::vector<TestInfo*> test_info_list_;
   // Provides a level of indirection for the test list to allow easy
   // shuffling and restoring the test order.  The i-th element in this
   // vector is the index of the i-th test in the shuffled test list.
   std::vector<int> test_indices_;
   // Pointer to the function that sets up the test suite.
   internal::SetUpTestSuiteFunc set_up_tc_;
   // Pointer to the function that tears down the test suite.
   internal::TearDownTestSuiteFunc tear_down_tc_;
   // True if and only if any test in this test suite should run.
   bool should_run_;
   // The start time, in milliseconds since UNIX Epoch.
   TimeInMillis start_timestamp_;
   // Elapsed time, in milliseconds.
   TimeInMillis elapsed_time_;
   // Holds test properties recorded during execution of SetUpTestSuite and
   // TearDownTestSuite.
   TestResult ad_hoc_test_result_;
 
   // We disallow copying TestSuites.
   TestSuite(const TestSuite&) = delete;
   TestSuite& operator=(const TestSuite&) = delete;
 };
 
 // An Environment object is capable of setting up and tearing down an
 // environment.  You should subclass this to define your own
 // environment(s).
 //
 // An Environment object does the set-up and tear-down in virtual
 // methods SetUp() and TearDown() instead of the constructor and the
 // destructor, as:
 //
 //   1. You cannot safely throw from a destructor.  This is a problem
 //      as in some cases Google Test is used where exceptions are enabled, and
 //      we may want to implement ASSERT_* using exceptions where they are
 //      available.
 //   2. You cannot use ASSERT_* directly in a constructor or
 //      destructor.
 class Environment {
  public:
   // The d'tor is virtual as we need to subclass Environment.
   virtual ~Environment() {}
 
   // Override this to define how to set up the environment.
   virtual void SetUp() {}
 
   // Override this to define how to tear down the environment.
   virtual void TearDown() {}
 
  private:
   // If you see an error about overriding the following function or
   // about it being private, you have mis-spelled SetUp() as Setup().
   struct Setup_should_be_spelled_SetUp {};
   virtual Setup_should_be_spelled_SetUp* Setup() { return nullptr; }
 };
 
 #if GTEST_HAS_EXCEPTIONS
 
 // Exception which can be thrown from TestEventListener::OnTestPartResult.
 class GTEST_API_ AssertionException
     : public internal::GoogleTestFailureException {
  public:
   explicit AssertionException(const TestPartResult& result)
       : GoogleTestFailureException(result) {}
 };
 
 #endif  // GTEST_HAS_EXCEPTIONS
 
 // The interface for tracing execution of tests. The methods are organized in
 // the order the corresponding events are fired.
 class TestEventListener {
  public:
   virtual ~TestEventListener() {}
 
   // Fired before any test activity starts.
   virtual void OnTestProgramStart(const UnitTest& unit_test) = 0;
 
   // Fired before each iteration of tests starts.  There may be more than
   // one iteration if GTEST_FLAG(repeat) is set. iteration is the iteration
   // index, starting from 0.
   virtual void OnTestIterationStart(const UnitTest& unit_test,
                                     int iteration) = 0;
 
   // Fired before environment set-up for each iteration of tests starts.
   virtual void OnEnvironmentsSetUpStart(const UnitTest& unit_test) = 0;
 
   // Fired after environment set-up for each iteration of tests ends.
   virtual void OnEnvironmentsSetUpEnd(const UnitTest& unit_test) = 0;
 
   // Fired before the test suite starts.
   virtual void OnTestSuiteStart(const TestSuite& /*test_suite*/) {}
 
   //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   virtual void OnTestCaseStart(const TestCase& /*test_case*/) {}
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   // Fired before the test starts.
   virtual void OnTestStart(const TestInfo& test_info) = 0;
 
   // Fired when a test is disabled
   virtual void OnTestDisabled(const TestInfo& /*test_info*/) {}
 
   // Fired after a failed assertion or a SUCCEED() invocation.
   // If you want to throw an exception from this function to skip to the next
   // TEST, it must be AssertionException defined above, or inherited from it.
   virtual void OnTestPartResult(const TestPartResult& test_part_result) = 0;
 
   // Fired after the test ends.
   virtual void OnTestEnd(const TestInfo& test_info) = 0;
 
   // Fired after the test suite ends.
   virtual void OnTestSuiteEnd(const TestSuite& /*test_suite*/) {}
 
 //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   virtual void OnTestCaseEnd(const TestCase& /*test_case*/) {}
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   // Fired before environment tear-down for each iteration of tests starts.
   virtual void OnEnvironmentsTearDownStart(const UnitTest& unit_test) = 0;
 
   // Fired after environment tear-down for each iteration of tests ends.
   virtual void OnEnvironmentsTearDownEnd(const UnitTest& unit_test) = 0;
 
   // Fired after each iteration of tests finishes.
   virtual void OnTestIterationEnd(const UnitTest& unit_test, int iteration) = 0;
 
   // Fired after all test activities have ended.
   virtual void OnTestProgramEnd(const UnitTest& unit_test) = 0;
 };
 
 // The convenience class for users who need to override just one or two
 // methods and are not concerned that a possible change to a signature of
 // the methods they override will not be caught during the build.  For
 // comments about each method please see the definition of TestEventListener
 // above.
 class EmptyTestEventListener : public TestEventListener {
  public:
   void OnTestProgramStart(const UnitTest& /*unit_test*/) override {}
   void OnTestIterationStart(const UnitTest& /*unit_test*/,
                             int /*iteration*/) override {}
   void OnEnvironmentsSetUpStart(const UnitTest& /*unit_test*/) override {}
   void OnEnvironmentsSetUpEnd(const UnitTest& /*unit_test*/) override {}
   void OnTestSuiteStart(const TestSuite& /*test_suite*/) override {}
 //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   void OnTestCaseStart(const TestCase& /*test_case*/) override {}
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   void OnTestStart(const TestInfo& /*test_info*/) override {}
   void OnTestDisabled(const TestInfo& /*test_info*/) override {}
   void OnTestPartResult(const TestPartResult& /*test_part_result*/) override {}
   void OnTestEnd(const TestInfo& /*test_info*/) override {}
   void OnTestSuiteEnd(const TestSuite& /*test_suite*/) override {}
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   void OnTestCaseEnd(const TestCase& /*test_case*/) override {}
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   void OnEnvironmentsTearDownStart(const UnitTest& /*unit_test*/) override {}
   void OnEnvironmentsTearDownEnd(const UnitTest& /*unit_test*/) override {}
   void OnTestIterationEnd(const UnitTest& /*unit_test*/,
                           int /*iteration*/) override {}
   void OnTestProgramEnd(const UnitTest& /*unit_test*/) override {}
 };
 
 // TestEventListeners lets users add listeners to track events in Google Test.
 class GTEST_API_ TestEventListeners {
  public:
   TestEventListeners();
   ~TestEventListeners();
 
   // Appends an event listener to the end of the list. Google Test assumes
   // the ownership of the listener (i.e. it will delete the listener when
   // the test program finishes).
   void Append(TestEventListener* listener);
 
   // Removes the given event listener from the list and returns it.  It then
   // becomes the caller's responsibility to delete the listener. Returns
   // NULL if the listener is not found in the list.
   TestEventListener* Release(TestEventListener* listener);
 
   // Returns the standard listener responsible for the default console
   // output.  Can be removed from the listeners list to shut down default
   // console output.  Note that removing this object from the listener list
   // with Release transfers its ownership to the caller and makes this
   // function return NULL the next time.
   TestEventListener* default_result_printer() const {
     return default_result_printer_;
   }
 
   // Returns the standard listener responsible for the default XML output
   // controlled by the --gtest_output=xml flag.  Can be removed from the
   // listeners list by users who want to shut down the default XML output
   // controlled by this flag and substitute it with custom one.  Note that
   // removing this object from the listener list with Release transfers its
   // ownership to the caller and makes this function return NULL the next
   // time.
   TestEventListener* default_xml_generator() const {
     return default_xml_generator_;
   }
 
  private:
   friend class TestSuite;
   friend class TestInfo;
   friend class internal::DefaultGlobalTestPartResultReporter;
   friend class internal::NoExecDeathTest;
   friend class internal::TestEventListenersAccessor;
   friend class internal::UnitTestImpl;
 
   // Returns repeater that broadcasts the TestEventListener events to all
   // subscribers.
   TestEventListener* repeater();
 
   // Sets the default_result_printer attribute to the provided listener.
   // The listener is also added to the listener list and previous
   // default_result_printer is removed from it and deleted. The listener can
   // also be NULL in which case it will not be added to the list. Does
   // nothing if the previous and the current listener objects are the same.
   void SetDefaultResultPrinter(TestEventListener* listener);
 
   // Sets the default_xml_generator attribute to the provided listener.  The
   // listener is also added to the listener list and previous
   // default_xml_generator is removed from it and deleted. The listener can
   // also be NULL in which case it will not be added to the list. Does
   // nothing if the previous and the current listener objects are the same.
   void SetDefaultXmlGenerator(TestEventListener* listener);
 
   // Controls whether events will be forwarded by the repeater to the
   // listeners in the list.
   bool EventForwardingEnabled() const;
   void SuppressEventForwarding();
 
   // The actual list of listeners.
   internal::TestEventRepeater* repeater_;
   // Listener responsible for the standard result output.
   TestEventListener* default_result_printer_;
   // Listener responsible for the creation of the XML output file.
   TestEventListener* default_xml_generator_;
 
   // We disallow copying TestEventListeners.
   TestEventListeners(const TestEventListeners&) = delete;
   TestEventListeners& operator=(const TestEventListeners&) = delete;
 };
 
 // A UnitTest consists of a vector of TestSuites.
 //
 // This is a singleton class.  The only instance of UnitTest is
 // created when UnitTest::GetInstance() is first called.  This
 // instance is never deleted.
 //
 // UnitTest is not copyable.
 //
 // This class is thread-safe as long as the methods are called
 // according to their specification.
 class GTEST_API_ UnitTest {
  public:
   // Gets the singleton UnitTest object.  The first time this method
   // is called, a UnitTest object is constructed and returned.
   // Consecutive calls will return the same object.
   static UnitTest* GetInstance();
 
   // Runs all tests in this UnitTest object and prints the result.
   // Returns 0 if successful, or 1 otherwise.
   //
   // This method can only be called from the main thread.
   //
   // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
   int Run() GTEST_MUST_USE_RESULT_;
 
   // Returns the working directory when the first TEST() or TEST_F()
   // was executed.  The UnitTest object owns the string.
   const char* original_working_dir() const;
 
   // Returns the TestSuite object for the test that's currently running,
   // or NULL if no test is running.
   const TestSuite* current_test_suite() const GTEST_LOCK_EXCLUDED_(mutex_);
 
 // Legacy API is still available but deprecated
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   const TestCase* current_test_case() const GTEST_LOCK_EXCLUDED_(mutex_);
 #endif
 
   // Returns the TestInfo object for the test that's currently running,
   // or NULL if no test is running.
   const TestInfo* current_test_info() const GTEST_LOCK_EXCLUDED_(mutex_);
 
   // Returns the random seed used at the start of the current test run.
   int random_seed() const;
 
   // Returns the ParameterizedTestSuiteRegistry object used to keep track of
   // value-parameterized tests and instantiate and register them.
   //
   // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
   internal::ParameterizedTestSuiteRegistry& parameterized_test_registry()
       GTEST_LOCK_EXCLUDED_(mutex_);
 
   // Gets the number of successful test suites.
   int successful_test_suite_count() const;
 
   // Gets the number of failed test suites.
   int failed_test_suite_count() const;
 
   // Gets the number of all test suites.
   int total_test_suite_count() const;
 
   // Gets the number of all test suites that contain at least one test
   // that should run.
   int test_suite_to_run_count() const;
 
   //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   int successful_test_case_count() const;
   int failed_test_case_count() const;
   int total_test_case_count() const;
   int test_case_to_run_count() const;
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   // Gets the number of successful tests.
   int successful_test_count() const;
 
   // Gets the number of skipped tests.
   int skipped_test_count() const;
 
   // Gets the number of failed tests.
   int failed_test_count() const;
 
   // Gets the number of disabled tests that will be reported in the XML report.
   int reportable_disabled_test_count() const;
 
   // Gets the number of disabled tests.
   int disabled_test_count() const;
 
   // Gets the number of tests to be printed in the XML report.
   int reportable_test_count() const;
 
   // Gets the number of all tests.
   int total_test_count() const;
 
   // Gets the number of tests that should run.
   int test_to_run_count() const;
 
   // Gets the time of the test program start, in ms from the start of the
   // UNIX epoch.
   TimeInMillis start_timestamp() const;
 
   // Gets the elapsed time, in milliseconds.
   TimeInMillis elapsed_time() const;
 
   // Returns true if and only if the unit test passed (i.e. all test suites
   // passed).
   bool Passed() const;
 
   // Returns true if and only if the unit test failed (i.e. some test suite
   // failed or something outside of all tests failed).
   bool Failed() const;
 
   // Gets the i-th test suite among all the test suites. i can range from 0 to
   // total_test_suite_count() - 1. If i is not in that range, returns NULL.
   const TestSuite* GetTestSuite(int i) const;
 
 //  Legacy API is deprecated but still available
 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
   const TestCase* GetTestCase(int i) const;
 #endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 
   // Returns the TestResult containing information on test failures and
   // properties logged outside of individual test suites.
   const TestResult& ad_hoc_test_result() const;
 
   // Returns the list of event listeners that can be used to track events
   // inside Google Test.
   TestEventListeners& listeners();
 
  private:
   // Registers and returns a global test environment.  When a test
   // program is run, all global test environments will be set-up in
   // the order they were registered.  After all tests in the program
   // have finished, all global test environments will be torn-down in
   // the *reverse* order they were registered.
   //
   // The UnitTest object takes ownership of the given environment.
   //
   // This method can only be called from the main thread.
   Environment* AddEnvironment(Environment* env);
 
   // Adds a TestPartResult to the current TestResult object.  All
   // Google Test assertion macros (e.g. ASSERT_TRUE, EXPECT_EQ, etc)
   // eventually call this to report their results.  The user code
   // should use the assertion macros instead of calling this directly.
   void AddTestPartResult(TestPartResult::Type result_type,
                          const char* file_name, int line_number,
                          const std::string& message,
                          const std::string& os_stack_trace)
       GTEST_LOCK_EXCLUDED_(mutex_);
 
   // Adds a TestProperty to the current TestResult object when invoked from
   // inside a test, to current TestSuite's ad_hoc_test_result_ when invoked
   // from SetUpTestSuite or TearDownTestSuite, or to the global property set
   // when invoked elsewhere.  If the result already contains a property with
   // the same key, the value will be updated.
   void RecordProperty(const std::string& key, const std::string& value);
 
   // Gets the i-th test suite among all the test suites. i can range from 0 to
   // total_test_suite_count() - 1. If i is not in that range, returns NULL.
   TestSuite* GetMutableTestSuite(int i);
 
   // Accessors for the implementation object.
   internal::UnitTestImpl* impl() { return impl_; }
   const internal::UnitTestImpl* impl() const { return impl_; }
 
   // These classes and functions are friends as they need to access private
   // members of UnitTest.
   friend class ScopedTrace;
   friend class Test;
   friend class internal::AssertHelper;
   friend class internal::StreamingListenerTest;
   friend class internal::UnitTestRecordPropertyTestHelper;
   friend Environment* AddGlobalTestEnvironment(Environment* env);
   friend std::set<std::string>* internal::GetIgnoredParameterizedTestSuites();
   friend internal::UnitTestImpl* internal::GetUnitTestImpl();
   friend void internal::ReportFailureInUnknownLocation(
       TestPartResult::Type result_type, const std::string& message);
 
   // Creates an empty UnitTest.
   UnitTest();
 
   // D'tor
   virtual ~UnitTest();
 
   // Pushes a trace defined by SCOPED_TRACE() on to the per-thread
   // Google Test trace stack.
   void PushGTestTrace(const internal::TraceInfo& trace)
       GTEST_LOCK_EXCLUDED_(mutex_);
 
   // Pops a trace from the per-thread Google Test trace stack.
   void PopGTestTrace() GTEST_LOCK_EXCLUDED_(mutex_);
 
   // Protects mutable state in *impl_.  This is mutable as some const
   // methods need to lock it too.
   mutable internal::Mutex mutex_;
 
   // Opaque implementation object.  This field is never changed once
   // the object is constructed.  We don't mark it as const here, as
   // doing so will cause a warning in the constructor of UnitTest.
   // Mutable state in *impl_ is protected by mutex_.
   internal::UnitTestImpl* impl_;
 
   // We disallow copying UnitTest.
   UnitTest(const UnitTest&) = delete;
   UnitTest& operator=(const UnitTest&) = delete;
 };
 
 // A convenient wrapper for adding an environment for the test
 // program.
 //
 // You should call this before RUN_ALL_TESTS() is called, probably in
 // main().  If you use gtest_main, you need to call this before main()
 // starts for it to take effect.  For example, you can define a global
 // variable like this:
 //
 //   testing::Environment* const foo_env =
 //       testing::AddGlobalTestEnvironment(new FooEnvironment);
 //
 // However, we strongly recommend you to write your own main() and
 // call AddGlobalTestEnvironment() there, as relying on initialization
 // of global variables makes the code harder to read and may cause
 // problems when you register multiple environments from different
 // translation units and the environments have dependencies among them
 // (remember that the compiler doesn't guarantee the order in which
 // global variables from different translation units are initialized).
 inline Environment* AddGlobalTestEnvironment(Environment* env) {
   return UnitTest::GetInstance()->AddEnvironment(env);
 }
 
 // Initializes Google Test.  This must be called before calling
 // RUN_ALL_TESTS().  In particular, it parses a command line for the
 // flags that Google Test recognizes.  Whenever a Google Test flag is
 // seen, it is removed from argv, and *argc is decremented.
 //
 // No value is returned.  Instead, the Google Test flag variables are
 // updated.
 //
 // Calling the function for the second time has no user-visible effect.
 GTEST_API_ void InitGoogleTest(int* argc, char** argv);
 
 // This overloaded version can be used in Windows programs compiled in
 // UNICODE mode.
 GTEST_API_ void InitGoogleTest(int* argc, wchar_t** argv);
 
 // This overloaded version can be used on Arduino/embedded platforms where
 // there is no argc/argv.
 GTEST_API_ void InitGoogleTest();
 
 namespace internal {
 
 // Separate the error generating code from the code path to reduce the stack
 // frame size of CmpHelperEQ. This helps reduce the overhead of some sanitizers
 // when calling EXPECT_* in a tight loop.
 template <typename T1, typename T2>
 AssertionResult CmpHelperEQFailure(const char* lhs_expression,
                                    const char* rhs_expression, const T1& lhs,
                                    const T2& rhs) {
   return EqFailure(lhs_expression, rhs_expression,
                    FormatForComparisonFailureMessage(lhs, rhs),
                    FormatForComparisonFailureMessage(rhs, lhs), false);
 }
 
 // This block of code defines operator==/!=
 // to block lexical scope lookup.
 // It prevents using invalid operator==/!= defined at namespace scope.
 struct faketype {};
 inline bool operator==(faketype, faketype) { return true; }
 inline bool operator!=(faketype, faketype) { return false; }
 
 // The helper function for {ASSERT|EXPECT}_EQ.
 template <typename T1, typename T2>
 AssertionResult CmpHelperEQ(const char* lhs_expression,
                             const char* rhs_expression, const T1& lhs,
                             const T2& rhs) {
   if (lhs == rhs) {
     return AssertionSuccess();
   }
 
   return CmpHelperEQFailure(lhs_expression, rhs_expression, lhs, rhs);
 }
 
 class EqHelper {
  public:
   // This templatized version is for the general case.
   template <
       typename T1, typename T2,
       // Disable this overload for cases where one argument is a pointer
       // and the other is the null pointer constant.
       typename std::enable_if<!std::is_integral<T1>::value ||
                               !std::is_pointer<T2>::value>::type* = nullptr>
   static AssertionResult Compare(const char* lhs_expression,
                                  const char* rhs_expression, const T1& lhs,
                                  const T2& rhs) {
     return CmpHelperEQ(lhs_expression, rhs_expression, lhs, rhs);
   }
 
   // With this overloaded version, we allow anonymous enums to be used
   // in {ASSERT|EXPECT}_EQ when compiled with gcc 4, as anonymous
   // enums can be implicitly cast to BiggestInt.
   //
   // Even though its body looks the same as the above version, we
   // cannot merge the two, as it will make anonymous enums unhappy.
   static AssertionResult Compare(const char* lhs_expression,
                                  const char* rhs_expression, BiggestInt lhs,
                                  BiggestInt rhs) {
     return CmpHelperEQ(lhs_expression, rhs_expression, lhs, rhs);
   }
 
   template <typename T>
   static AssertionResult Compare(
       const char* lhs_expression, const char* rhs_expression,
       // Handle cases where '0' is used as a null pointer literal.
       std::nullptr_t /* lhs */, T* rhs) {
     // We already know that 'lhs' is a null pointer.
     return CmpHelperEQ(lhs_expression, rhs_expression, static_cast<T*>(nullptr),
                        rhs);
   }
 };
 
 // Separate the error generating code from the code path to reduce the stack
 // frame size of CmpHelperOP. This helps reduce the overhead of some sanitizers
 // when calling EXPECT_OP in a tight loop.
 template <typename T1, typename T2>
 AssertionResult CmpHelperOpFailure(const char* expr1, const char* expr2,
                                    const T1& val1, const T2& val2,
                                    const char* op) {
   return AssertionFailure()
          << "Expected: (" << expr1 << ") " << op << " (" << expr2
          << "), actual: " << FormatForComparisonFailureMessage(val1, val2)
          << " vs " << FormatForComparisonFailureMessage(val2, val1);
 }
 
 // A macro for implementing the helper functions needed to implement
 // ASSERT_?? and EXPECT_??.  It is here just to avoid copy-and-paste
 // of similar code.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 
 #define GTEST_IMPL_CMP_HELPER_(op_name, op)                                \
   template <typename T1, typename T2>                                      \
   AssertionResult CmpHelper##op_name(const char* expr1, const char* expr2, \
                                      const T1& val1, const T2& val2) {     \
     if (val1 op val2) {                                                    \
       return AssertionSuccess();                                           \
     } else {                                                               \
       return CmpHelperOpFailure(expr1, expr2, val1, val2, #op);            \
     }                                                                      \
   }
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 
 // Implements the helper function for {ASSERT|EXPECT}_NE
 GTEST_IMPL_CMP_HELPER_(NE, !=)
 // Implements the helper function for {ASSERT|EXPECT}_LE
 GTEST_IMPL_CMP_HELPER_(LE, <=)
 // Implements the helper function for {ASSERT|EXPECT}_LT
 GTEST_IMPL_CMP_HELPER_(LT, <)
 // Implements the helper function for {ASSERT|EXPECT}_GE
 GTEST_IMPL_CMP_HELPER_(GE, >=)
 // Implements the helper function for {ASSERT|EXPECT}_GT
 GTEST_IMPL_CMP_HELPER_(GT, >)
 
 #undef GTEST_IMPL_CMP_HELPER_
 
 // The helper function for {ASSERT|EXPECT}_STREQ.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult CmpHelperSTREQ(const char* s1_expression,
                                           const char* s2_expression,
                                           const char* s1, const char* s2);
 
 // The helper function for {ASSERT|EXPECT}_STRCASEEQ.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult CmpHelperSTRCASEEQ(const char* s1_expression,
                                               const char* s2_expression,
                                               const char* s1, const char* s2);
 
 // The helper function for {ASSERT|EXPECT}_STRNE.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult CmpHelperSTRNE(const char* s1_expression,
                                           const char* s2_expression,
                                           const char* s1, const char* s2);
 
 // The helper function for {ASSERT|EXPECT}_STRCASENE.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult CmpHelperSTRCASENE(const char* s1_expression,
                                               const char* s2_expression,
                                               const char* s1, const char* s2);
 
 // Helper function for *_STREQ on wide strings.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult CmpHelperSTREQ(const char* s1_expression,
                                           const char* s2_expression,
                                           const wchar_t* s1, const wchar_t* s2);
 
 // Helper function for *_STRNE on wide strings.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult CmpHelperSTRNE(const char* s1_expression,
                                           const char* s2_expression,
                                           const wchar_t* s1, const wchar_t* s2);
 
 }  // namespace internal
 
 // IsSubstring() and IsNotSubstring() are intended to be used as the
 // first argument to {EXPECT,ASSERT}_PRED_FORMAT2(), not by
 // themselves.  They check whether needle is a substring of haystack
 // (NULL is considered a substring of itself only), and return an
 // appropriate error message when they fail.
 //
 // The {needle,haystack}_expr arguments are the stringified
 // expressions that generated the two real arguments.
 GTEST_API_ AssertionResult IsSubstring(const char* needle_expr,
                                        const char* haystack_expr,
                                        const char* needle,
                                        const char* haystack);
 GTEST_API_ AssertionResult IsSubstring(const char* needle_expr,
                                        const char* haystack_expr,
                                        const wchar_t* needle,
                                        const wchar_t* haystack);
 GTEST_API_ AssertionResult IsNotSubstring(const char* needle_expr,
                                           const char* haystack_expr,
                                           const char* needle,
                                           const char* haystack);
 GTEST_API_ AssertionResult IsNotSubstring(const char* needle_expr,
                                           const char* haystack_expr,
                                           const wchar_t* needle,
                                           const wchar_t* haystack);
 GTEST_API_ AssertionResult IsSubstring(const char* needle_expr,
                                        const char* haystack_expr,
                                        const ::std::string& needle,
                                        const ::std::string& haystack);
 GTEST_API_ AssertionResult IsNotSubstring(const char* needle_expr,
                                           const char* haystack_expr,
                                           const ::std::string& needle,
                                           const ::std::string& haystack);
 
 #if GTEST_HAS_STD_WSTRING
 GTEST_API_ AssertionResult IsSubstring(const char* needle_expr,
                                        const char* haystack_expr,
                                        const ::std::wstring& needle,
                                        const ::std::wstring& haystack);
 GTEST_API_ AssertionResult IsNotSubstring(const char* needle_expr,
                                           const char* haystack_expr,
                                           const ::std::wstring& needle,
                                           const ::std::wstring& haystack);
 #endif  // GTEST_HAS_STD_WSTRING
 
 namespace internal {
 
 // Helper template function for comparing floating-points.
 //
 // Template parameter:
 //
 //   RawType: the raw floating-point type (either float or double)
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 template <typename RawType>
 AssertionResult CmpHelperFloatingPointEQ(const char* lhs_expression,
                                          const char* rhs_expression,
                                          RawType lhs_value, RawType rhs_value) {
   const FloatingPoint<RawType> lhs(lhs_value), rhs(rhs_value);
 
   if (lhs.AlmostEquals(rhs)) {
     return AssertionSuccess();
   }
 
   ::std::stringstream lhs_ss;
   lhs_ss << std::setprecision(std::numeric_limits<RawType>::digits10 + 2)
          << lhs_value;
 
   ::std::stringstream rhs_ss;
   rhs_ss << std::setprecision(std::numeric_limits<RawType>::digits10 + 2)
          << rhs_value;
 
   return EqFailure(lhs_expression, rhs_expression,
                    StringStreamToString(&lhs_ss), StringStreamToString(&rhs_ss),
                    false);
 }
 
 // Helper function for implementing ASSERT_NEAR.
 //
 // INTERNAL IMPLEMENTATION - DO NOT USE IN A USER PROGRAM.
 GTEST_API_ AssertionResult DoubleNearPredFormat(const char* expr1,
                                                 const char* expr2,
                                                 const char* abs_error_expr,
                                                 double val1, double val2,
                                                 double abs_error);
 
 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 // A class that enables one to stream messages to assertion macros
 class GTEST_API_ AssertHelper {
  public:
   // Constructor.
   AssertHelper(TestPartResult::Type type, const char* file, int line,
                const char* message);
   ~AssertHelper();
 
   // Message assignment is a semantic trick to enable assertion
   // streaming; see the GTEST_MESSAGE_ macro below.
   void operator=(const Message& message) const;
 
  private:
   // We put our data in a struct so that the size of the AssertHelper class can
   // be as small as possible.  This is important because gcc is incapable of
   // re-using stack space even for temporary variables, so every EXPECT_EQ
   // reserves stack space for another AssertHelper.
   struct AssertHelperData {
     AssertHelperData(TestPartResult::Type t, const char* srcfile, int line_num,
                      const char* msg)
         : type(t), file(srcfile), line(line_num), message(msg) {}
 
     TestPartResult::Type const type;
     const char* const file;
     int const line;
     std::string const message;
 
    private:
     AssertHelperData(const AssertHelperData&) = delete;
     AssertHelperData& operator=(const AssertHelperData&) = delete;
   };
 
   AssertHelperData* const data_;
 
   AssertHelper(const AssertHelper&) = delete;
   AssertHelper& operator=(const AssertHelper&) = delete;
 };
 
 }  // namespace internal
 
 // The pure interface class that all value-parameterized tests inherit from.
 // A value-parameterized class must inherit from both ::testing::Test and
 // ::testing::WithParamInterface. In most cases that just means inheriting
 // from ::testing::TestWithParam, but more complicated test hierarchies
 // may need to inherit from Test and WithParamInterface at different levels.
 //
 // This interface has support for accessing the test parameter value via
 // the GetParam() method.
 //
 // Use it with one of the parameter generator defining functions, like Range(),
 // Values(), ValuesIn(), Bool(), and Combine().
 //
 // class FooTest : public ::testing::TestWithParam<int> {
 //  protected:
 //   FooTest() {
 //     // Can use GetParam() here.
 //   }
 //   ~FooTest() override {
 //     // Can use GetParam() here.
 //   }
 //   void SetUp() override {
 //     // Can use GetParam() here.
 //   }
 //   void TearDown override {
 //     // Can use GetParam() here.
 //   }
 // };
 // TEST_P(FooTest, DoesBar) {
 //   // Can use GetParam() method here.
 //   Foo foo;
 //   ASSERT_TRUE(foo.DoesBar(GetParam()));
 // }
 // INSTANTIATE_TEST_SUITE_P(OneToTenRange, FooTest, ::testing::Range(1, 10));
 
 template <typename T>
 class WithParamInterface {
  public:
   typedef T ParamType;
   virtual ~WithParamInterface() {}
 
   // The current parameter value. Is also available in the test fixture's
   // constructor.
   static const ParamType& GetParam() {
     GTEST_CHECK_(parameter_ != nullptr)
         << "GetParam() can only be called inside a value-parameterized test "
         << "-- did you intend to write TEST_P instead of TEST_F?";
     return *parameter_;
   }
 
  private:
   // Sets parameter value. The caller is responsible for making sure the value
   // remains alive and unchanged throughout the current test.
   static void SetParam(const ParamType* parameter) { parameter_ = parameter; }
 
   // Static value used for accessing parameter during a test lifetime.
   static const ParamType* parameter_;
 
   // TestClass must be a subclass of WithParamInterface<T> and Test.
   template <class TestClass>
   friend class internal::ParameterizedTestFactory;
 };
 
 template <typename T>
 const T* WithParamInterface<T>::parameter_ = nullptr;
 
 // Most value-parameterized classes can ignore the existence of
 // WithParamInterface, and can just inherit from ::testing::TestWithParam.
 
 template <typename T>
 class TestWithParam : public Test, public WithParamInterface<T> {};
 
 // Macros for indicating success/failure in test code.
 
 // Skips test in runtime.
 // Skipping test aborts current function.
 // Skipped tests are neither successful nor failed.
 #define GTEST_SKIP() GTEST_SKIP_("")
 
 // ADD_FAILURE unconditionally adds a failure to the current test.
 // SUCCEED generates a success - it doesn't automatically make the
 // current test successful, as a test is only successful when it has
 // no failure.
 //
 // EXPECT_* verifies that a certain condition is satisfied.  If not,
 // it behaves like ADD_FAILURE.  In particular:
 //
 //   EXPECT_TRUE  verifies that a Boolean condition is true.
 //   EXPECT_FALSE verifies that a Boolean condition is false.
 //
 // FAIL and ASSERT_* are similar to ADD_FAILURE and EXPECT_*, except
 // that they will also abort the current function on failure.  People
 // usually want the fail-fast behavior of FAIL and ASSERT_*, but those
 // writing data-driven tests often find themselves using ADD_FAILURE
 // and EXPECT_* more.
 
 // Generates a nonfatal failure with a generic message.
 #define ADD_FAILURE() GTEST_NONFATAL_FAILURE_("Failed")
 
 // Generates a nonfatal failure at the given source file location with
 // a generic message.
 #define ADD_FAILURE_AT(file, line)        \
   GTEST_MESSAGE_AT_(file, line, "Failed", \
                     ::testing::TestPartResult::kNonFatalFailure)
 
 // Generates a fatal failure with a generic message.
 #define GTEST_FAIL() GTEST_FATAL_FAILURE_("Failed")
 
 // Like GTEST_FAIL(), but at the given source file location.
 #define GTEST_FAIL_AT(file, line)         \
   GTEST_MESSAGE_AT_(file, line, "Failed", \
                     ::testing::TestPartResult::kFatalFailure)
 
 // Define this macro to 1 to omit the definition of FAIL(), which is a
 // generic name and clashes with some other libraries.
 #if !GTEST_DONT_DEFINE_FAIL
 #define FAIL() GTEST_FAIL()
 #endif
 
 // Generates a success with a generic message.
 #define GTEST_SUCCEED() GTEST_SUCCESS_("Succeeded")
 
 // Define this macro to 1 to omit the definition of SUCCEED(), which
 // is a generic name and clashes with some other libraries.
 #if !GTEST_DONT_DEFINE_SUCCEED
 #define SUCCEED() GTEST_SUCCEED()
 #endif
 
 // Macros for testing exceptions.
 //
 //    * {ASSERT|EXPECT}_THROW(statement, expected_exception):
 //         Tests that the statement throws the expected exception.
 //    * {ASSERT|EXPECT}_NO_THROW(statement):
 //         Tests that the statement doesn't throw any exception.
 //    * {ASSERT|EXPECT}_ANY_THROW(statement):
 //         Tests that the statement throws an exception.
 
 #define EXPECT_THROW(statement, expected_exception) \
   GTEST_TEST_THROW_(statement, expected_exception, GTEST_NONFATAL_FAILURE_)
 #define EXPECT_NO_THROW(statement) \
   GTEST_TEST_NO_THROW_(statement, GTEST_NONFATAL_FAILURE_)
 #define EXPECT_ANY_THROW(statement) \
   GTEST_TEST_ANY_THROW_(statement, GTEST_NONFATAL_FAILURE_)
 #define ASSERT_THROW(statement, expected_exception) \
   GTEST_TEST_THROW_(statement, expected_exception, GTEST_FATAL_FAILURE_)
 #define ASSERT_NO_THROW(statement) \
   GTEST_TEST_NO_THROW_(statement, GTEST_FATAL_FAILURE_)
 #define ASSERT_ANY_THROW(statement) \
   GTEST_TEST_ANY_THROW_(statement, GTEST_FATAL_FAILURE_)
 
 // Boolean assertions. Condition can be either a Boolean expression or an
 // AssertionResult. For more information on how to use AssertionResult with
 // these macros see comments on that class.
 #define GTEST_EXPECT_TRUE(condition)                      \
   GTEST_TEST_BOOLEAN_(condition, #condition, false, true, \
                       GTEST_NONFATAL_FAILURE_)
 #define GTEST_EXPECT_FALSE(condition)                        \
   GTEST_TEST_BOOLEAN_(!(condition), #condition, true, false, \
                       GTEST_NONFATAL_FAILURE_)
 #define GTEST_ASSERT_TRUE(condition) \
   GTEST_TEST_BOOLEAN_(condition, #condition, false, true, GTEST_FATAL_FAILURE_)
 #define GTEST_ASSERT_FALSE(condition)                        \
   GTEST_TEST_BOOLEAN_(!(condition), #condition, true, false, \
                       GTEST_FATAL_FAILURE_)
 
 // Define these macros to 1 to omit the definition of the corresponding
 // EXPECT or ASSERT, which clashes with some users' own code.
 
 #if !GTEST_DONT_DEFINE_EXPECT_TRUE
 #define EXPECT_TRUE(condition) GTEST_EXPECT_TRUE(condition)
 #endif
 
 #if !GTEST_DONT_DEFINE_EXPECT_FALSE
 #define EXPECT_FALSE(condition) GTEST_EXPECT_FALSE(condition)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_TRUE
 #define ASSERT_TRUE(condition) GTEST_ASSERT_TRUE(condition)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_FALSE
 #define ASSERT_FALSE(condition) GTEST_ASSERT_FALSE(condition)
 #endif
 
 // Macros for testing equalities and inequalities.
 //
 //    * {ASSERT|EXPECT}_EQ(v1, v2): Tests that v1 == v2
 //    * {ASSERT|EXPECT}_NE(v1, v2): Tests that v1 != v2
 //    * {ASSERT|EXPECT}_LT(v1, v2): Tests that v1 < v2
 //    * {ASSERT|EXPECT}_LE(v1, v2): Tests that v1 <= v2
 //    * {ASSERT|EXPECT}_GT(v1, v2): Tests that v1 > v2
 //    * {ASSERT|EXPECT}_GE(v1, v2): Tests that v1 >= v2
 //
 // When they are not, Google Test prints both the tested expressions and
 // their actual values.  The values must be compatible built-in types,
 // or you will get a compiler error.  By "compatible" we mean that the
 // values can be compared by the respective operator.
 //
 // Note:
 //
 //   1. It is possible to make a user-defined type work with
 //   {ASSERT|EXPECT}_??(), but that requires overloading the
 //   comparison operators and is thus discouraged by the Google C++
 //   Usage Guide.  Therefore, you are advised to use the
 //   {ASSERT|EXPECT}_TRUE() macro to assert that two objects are
 //   equal.
 //
 //   2. The {ASSERT|EXPECT}_??() macros do pointer comparisons on
 //   pointers (in particular, C strings).  Therefore, if you use it
 //   with two C strings, you are testing how their locations in memory
 //   are related, not how their content is related.  To compare two C
 //   strings by content, use {ASSERT|EXPECT}_STR*().
 //
 //   3. {ASSERT|EXPECT}_EQ(v1, v2) is preferred to
 //   {ASSERT|EXPECT}_TRUE(v1 == v2), as the former tells you
 //   what the actual value is when it fails, and similarly for the
 //   other comparisons.
 //
 //   4. Do not depend on the order in which {ASSERT|EXPECT}_??()
 //   evaluate their arguments, which is undefined.
 //
 //   5. These macros evaluate their arguments exactly once.
 //
 // Examples:
 //
 //   EXPECT_NE(Foo(), 5);
 //   EXPECT_EQ(a_pointer, NULL);
 //   ASSERT_LT(i, array_size);
 //   ASSERT_GT(records.size(), 0) << "There is no record left.";
 
 #define EXPECT_EQ(val1, val2) \
   EXPECT_PRED_FORMAT2(::testing::internal::EqHelper::Compare, val1, val2)
 #define EXPECT_NE(val1, val2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperNE, val1, val2)
 #define EXPECT_LE(val1, val2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperLE, val1, val2)
 #define EXPECT_LT(val1, val2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperLT, val1, val2)
 #define EXPECT_GE(val1, val2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperGE, val1, val2)
 #define EXPECT_GT(val1, val2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperGT, val1, val2)
 
 #define GTEST_ASSERT_EQ(val1, val2) \
   ASSERT_PRED_FORMAT2(::testing::internal::EqHelper::Compare, val1, val2)
 #define GTEST_ASSERT_NE(val1, val2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperNE, val1, val2)
 #define GTEST_ASSERT_LE(val1, val2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperLE, val1, val2)
 #define GTEST_ASSERT_LT(val1, val2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperLT, val1, val2)
 #define GTEST_ASSERT_GE(val1, val2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperGE, val1, val2)
 #define GTEST_ASSERT_GT(val1, val2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperGT, val1, val2)
 
 // Define macro GTEST_DONT_DEFINE_ASSERT_XY to 1 to omit the definition of
 // ASSERT_XY(), which clashes with some users' own code.
 
 #if !GTEST_DONT_DEFINE_ASSERT_EQ
 #define ASSERT_EQ(val1, val2) GTEST_ASSERT_EQ(val1, val2)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_NE
 #define ASSERT_NE(val1, val2) GTEST_ASSERT_NE(val1, val2)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_LE
 #define ASSERT_LE(val1, val2) GTEST_ASSERT_LE(val1, val2)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_LT
 #define ASSERT_LT(val1, val2) GTEST_ASSERT_LT(val1, val2)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_GE
 #define ASSERT_GE(val1, val2) GTEST_ASSERT_GE(val1, val2)
 #endif
 
 #if !GTEST_DONT_DEFINE_ASSERT_GT
 #define ASSERT_GT(val1, val2) GTEST_ASSERT_GT(val1, val2)
 #endif
 
 // C-string Comparisons.  All tests treat NULL and any non-NULL string
 // as different.  Two NULLs are equal.
 //
 //    * {ASSERT|EXPECT}_STREQ(s1, s2):     Tests that s1 == s2
 //    * {ASSERT|EXPECT}_STRNE(s1, s2):     Tests that s1 != s2
 //    * {ASSERT|EXPECT}_STRCASEEQ(s1, s2): Tests that s1 == s2, ignoring case
 //    * {ASSERT|EXPECT}_STRCASENE(s1, s2): Tests that s1 != s2, ignoring case
 //
 // For wide or narrow string objects, you can use the
 // {ASSERT|EXPECT}_??() macros.
 //
 // Don't depend on the order in which the arguments are evaluated,
 // which is undefined.
 //
 // These macros evaluate their arguments exactly once.
 
 #define EXPECT_STREQ(s1, s2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperSTREQ, s1, s2)
 #define EXPECT_STRNE(s1, s2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperSTRNE, s1, s2)
 #define EXPECT_STRCASEEQ(s1, s2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperSTRCASEEQ, s1, s2)
 #define EXPECT_STRCASENE(s1, s2) \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperSTRCASENE, s1, s2)
 
 #define ASSERT_STREQ(s1, s2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperSTREQ, s1, s2)
 #define ASSERT_STRNE(s1, s2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperSTRNE, s1, s2)
 #define ASSERT_STRCASEEQ(s1, s2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperSTRCASEEQ, s1, s2)
 #define ASSERT_STRCASENE(s1, s2) \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperSTRCASENE, s1, s2)
 
 // Macros for comparing floating-point numbers.
 //
 //    * {ASSERT|EXPECT}_FLOAT_EQ(val1, val2):
 //         Tests that two float values are almost equal.
 //    * {ASSERT|EXPECT}_DOUBLE_EQ(val1, val2):
 //         Tests that two double values are almost equal.
 //    * {ASSERT|EXPECT}_NEAR(v1, v2, abs_error):
 //         Tests that v1 and v2 are within the given distance to each other.
 //
 // Google Test uses ULP-based comparison to automatically pick a default
 // error bound that is appropriate for the operands.  See the
 // FloatingPoint template class in gtest-internal.h if you are
 // interested in the implementation details.
 
 #define EXPECT_FLOAT_EQ(val1, val2)                                         \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperFloatingPointEQ<float>, \
                       val1, val2)
 
 #define EXPECT_DOUBLE_EQ(val1, val2)                                         \
   EXPECT_PRED_FORMAT2(::testing::internal::CmpHelperFloatingPointEQ<double>, \
                       val1, val2)
 
 #define ASSERT_FLOAT_EQ(val1, val2)                                         \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperFloatingPointEQ<float>, \
                       val1, val2)
 
 #define ASSERT_DOUBLE_EQ(val1, val2)                                         \
   ASSERT_PRED_FORMAT2(::testing::internal::CmpHelperFloatingPointEQ<double>, \
                       val1, val2)
 
 #define EXPECT_NEAR(val1, val2, abs_error)                                   \
   EXPECT_PRED_FORMAT3(::testing::internal::DoubleNearPredFormat, val1, val2, \
                       abs_error)
 
 #define ASSERT_NEAR(val1, val2, abs_error)                                   \
   ASSERT_PRED_FORMAT3(::testing::internal::DoubleNearPredFormat, val1, val2, \
                       abs_error)
 
 // These predicate format functions work on floating-point values, and
 // can be used in {ASSERT|EXPECT}_PRED_FORMAT2*(), e.g.
 //
 //   EXPECT_PRED_FORMAT2(testing::DoubleLE, Foo(), 5.0);
 
 // Asserts that val1 is less than, or almost equal to, val2.  Fails
 // otherwise.  In particular, it fails if either val1 or val2 is NaN.
 GTEST_API_ AssertionResult FloatLE(const char* expr1, const char* expr2,
                                    float val1, float val2);
 GTEST_API_ AssertionResult DoubleLE(const char* expr1, const char* expr2,
                                     double val1, double val2);
 
 #if GTEST_OS_WINDOWS
 
 // Macros that test for HRESULT failure and success, these are only useful
 // on Windows, and rely on Windows SDK macros and APIs to compile.
 //
 //    * {ASSERT|EXPECT}_HRESULT_{SUCCEEDED|FAILED}(expr)
 //
 // When expr unexpectedly fails or succeeds, Google Test prints the
 // expected result and the actual result with both a human-readable
 // string representation of the error, if available, as well as the
 // hex result code.
 #define EXPECT_HRESULT_SUCCEEDED(expr) \
   EXPECT_PRED_FORMAT1(::testing::internal::IsHRESULTSuccess, (expr))
 
 #define ASSERT_HRESULT_SUCCEEDED(expr) \
   ASSERT_PRED_FORMAT1(::testing::internal::IsHRESULTSuccess, (expr))
 
 #define EXPECT_HRESULT_FAILED(expr) \
   EXPECT_PRED_FORMAT1(::testing::internal::IsHRESULTFailure, (expr))
 
 #define ASSERT_HRESULT_FAILED(expr) \
   ASSERT_PRED_FORMAT1(::testing::internal::IsHRESULTFailure, (expr))
 
 #endif  // GTEST_OS_WINDOWS
 
 // Macros that execute statement and check that it doesn't generate new fatal
 // failures in the current thread.
 //
 //   * {ASSERT|EXPECT}_NO_FATAL_FAILURE(statement);
 //
 // Examples:
 //
 //   EXPECT_NO_FATAL_FAILURE(Process());
 //   ASSERT_NO_FATAL_FAILURE(Process()) << "Process() failed";
 //
 #define ASSERT_NO_FATAL_FAILURE(statement) \
   GTEST_TEST_NO_FATAL_FAILURE_(statement, GTEST_FATAL_FAILURE_)
 #define EXPECT_NO_FATAL_FAILURE(statement) \
   GTEST_TEST_NO_FATAL_FAILURE_(statement, GTEST_NONFATAL_FAILURE_)
 
 // Causes a trace (including the given source file path and line number,
 // and the given message) to be included in every test failure message generated
 // by code in the scope of the lifetime of an instance of this class. The effect
 // is undone with the destruction of the instance.
 //
 // The message argument can be anything streamable to std::ostream.
 //
 // Example:
 //   testing::ScopedTrace trace("file.cc", 123, "message");
 //
 class GTEST_API_ ScopedTrace {
  public:
   // The c'tor pushes the given source file location and message onto
   // a trace stack maintained by Google Test.
 
   // Template version. Uses Message() to convert the values into strings.
   // Slow, but flexible.
   template <typename T>
   ScopedTrace(const char* file, int line, const T& message) {
     PushTrace(file, line, (Message() << message).GetString());
   }
 
   // Optimize for some known types.
   ScopedTrace(const char* file, int line, const char* message) {
     PushTrace(file, line, message ? message : "(null)");
   }
 
   ScopedTrace(const char* file, int line, const std::string& message) {
     PushTrace(file, line, message);
   }
 
   // The d'tor pops the info pushed by the c'tor.
   //
   // Note that the d'tor is not virtual in order to be efficient.
   // Don't inherit from ScopedTrace!
   ~ScopedTrace();
 
  private:
   void PushTrace(const char* file, int line, std::string message);
 
   ScopedTrace(const ScopedTrace&) = delete;
   ScopedTrace& operator=(const ScopedTrace&) = delete;
 } GTEST_ATTRIBUTE_UNUSED_;  // A ScopedTrace object does its job in its
                             // c'tor and d'tor.  Therefore it doesn't
                             // need to be used otherwise.
 
 // Causes a trace (including the source file path, the current line
 // number, and the given message) to be included in every test failure
 // message generated by code in the current scope.  The effect is
 // undone when the control leaves the current scope.
 //
 // The message argument can be anything streamable to std::ostream.
 //
 // In the implementation, we include the current line number as part
 // of the dummy variable name, thus allowing multiple SCOPED_TRACE()s
 // to appear in the same block - as long as they are on different
 // lines.
 //
 // Assuming that each thread maintains its own stack of traces.
 // Therefore, a SCOPED_TRACE() would (correctly) only affect the
 // assertions in its own thread.
 #define SCOPED_TRACE(message)                                         \
   ::testing::ScopedTrace GTEST_CONCAT_TOKEN_(gtest_trace_, __LINE__)( \
       __FILE__, __LINE__, (message))
 
 // Compile-time assertion for type equality.
 // StaticAssertTypeEq<type1, type2>() compiles if and only if type1 and type2
 // are the same type.  The value it returns is not interesting.
 //
 // Instead of making StaticAssertTypeEq a class template, we make it a
 // function template that invokes a helper class template.  This
 // prevents a user from misusing StaticAssertTypeEq<T1, T2> by
 // defining objects of that type.
 //
 // CAVEAT:
 //
 // When used inside a method of a class template,
 // StaticAssertTypeEq<T1, T2>() is effective ONLY IF the method is
 // instantiated.  For example, given:
 //
 //   template <typename T> class Foo {
 //    public:
 //     void Bar() { testing::StaticAssertTypeEq<int, T>(); }
 //   };
 //
 // the code:
 //
 //   void Test1() { Foo<bool> foo; }
 //
 // will NOT generate a compiler error, as Foo<bool>::Bar() is never
 // actually instantiated.  Instead, you need:
 //
 //   void Test2() { Foo<bool> foo; foo.Bar(); }
 //
 // to cause a compiler error.
 template <typename T1, typename T2>
 constexpr bool StaticAssertTypeEq() noexcept {
   static_assert(std::is_same<T1, T2>::value, "T1 and T2 are not the same type");
   return true;
 }
 
 // Defines a test.
 //
 // The first parameter is the name of the test suite, and the second
 // parameter is the name of the test within the test suite.
 //
 // The convention is to end the test suite name with "Test".  For
 // example, a test suite for the Foo class can be named FooTest.
 //
 // Test code should appear between braces after an invocation of
 // this macro.  Example:
 //
 //   TEST(FooTest, InitializesCorrectly) {
 //     Foo foo;
 //     EXPECT_TRUE(foo.StatusIsOK());
 //   }
 
 // Note that we call GetTestTypeId() instead of GetTypeId<
 // ::testing::Test>() here to get the type ID of testing::Test.  This
 // is to work around a suspected linker bug when using Google Test as
 // a framework on Mac OS X.  The bug causes GetTypeId<
 // ::testing::Test>() to return different values depending on whether
 // the call is from the Google Test framework itself or from user test
 // code.  GetTestTypeId() is guaranteed to always return the same
 // value, as it always calls GetTypeId<>() from the Google Test
 // framework.
 #define GTEST_TEST(test_suite_name, test_name)             \
   GTEST_TEST_(test_suite_name, test_name, ::testing::Test, \
               ::testing::internal::GetTestTypeId())
 
 // Define this macro to 1 to omit the definition of TEST(), which
 // is a generic name and clashes with some other libraries.
 #if !GTEST_DONT_DEFINE_TEST
 #define TEST(test_suite_name, test_name) GTEST_TEST(test_suite_name, test_name)
 #endif
 
 // Defines a test that uses a test fixture.
 //
 // The first parameter is the name of the test fixture class, which
 // also doubles as the test suite name.  The second parameter is the
 // name of the test within the test suite.
 //
 // A test fixture class must be declared earlier.  The user should put
 // the test code between braces after using this macro.  Example:
 //
 //   class FooTest : public testing::Test {
 //    protected:
 //     void SetUp() override { b_.AddElement(3); }
 //
 //     Foo a_;
 //     Foo b_;
 //   };
 //
 //   TEST_F(FooTest, InitializesCorrectly) {
 //     EXPECT_TRUE(a_.StatusIsOK());
 //   }
 //
 //   TEST_F(FooTest, ReturnsElementCountCorrectly) {
 //     EXPECT_EQ(a_.size(), 0);
 //     EXPECT_EQ(b_.size(), 1);
 //   }
 #define GTEST_TEST_F(test_fixture, test_name)        \
   GTEST_TEST_(test_fixture, test_name, test_fixture, \
               ::testing::internal::GetTypeId<test_fixture>())
 #if !GTEST_DONT_DEFINE_TEST_F
 #define TEST_F(test_fixture, test_name) GTEST_TEST_F(test_fixture, test_name)
 #endif
 
 // Returns a path to temporary directory.
 // Tries to determine an appropriate directory for the platform.
 GTEST_API_ std::string TempDir();
 
 #ifdef _MSC_VER
 #pragma warning(pop)
 #endif
 
 // Dynamically registers a test with the framework.
 //
 // This is an advanced API only to be used when the `TEST` macros are
 // insufficient. The macros should be preferred when possible, as they avoid
 // most of the complexity of calling this function.
 //
 // The `factory` argument is a factory callable (move-constructible) object or
 // function pointer that creates a new instance of the Test object. It
 // handles ownership to the caller. The signature of the callable is
 // `Fixture*()`, where `Fixture` is the test fixture class for the test. All
 // tests registered with the same `test_suite_name` must return the same
 // fixture type. This is checked at runtime.
 //
 // The framework will infer the fixture class from the factory and will call
 // the `SetUpTestSuite` and `TearDownTestSuite` for it.
 //
 // Must be called before `RUN_ALL_TESTS()` is invoked, otherwise behavior is
 // undefined.
 //
 // Use case example:
 //
 // class MyFixture : public ::testing::Test {
 //  public:
 //   // All of these optional, just like in regular macro usage.
 //   static void SetUpTestSuite() { ... }
 //   static void TearDownTestSuite() { ... }
 //   void SetUp() override { ... }
 //   void TearDown() override { ... }
 // };
 //
 // class MyTest : public MyFixture {
 //  public:
 //   explicit MyTest(int data) : data_(data) {}
 //   void TestBody() override { ... }
 //
 //  private:
 //   int data_;
 // };
 //
 // void RegisterMyTests(const std::vector<int>& values) {
 //   for (int v : values) {
 //     ::testing::RegisterTest(
 //         "MyFixture", ("Test" + std::to_string(v)).c_str(), nullptr,
 //         std::to_string(v).c_str(),
 //         __FILE__, __LINE__,
 //         // Important to use the fixture type as the return type here.
 //         [=]() -> MyFixture* { return new MyTest(v); });
 //   }
 // }
 // ...
 // int main(int argc, char** argv) {
 //   ::testing::InitGoogleTest(&argc, argv);
 //   std::vector<int> values_to_test = LoadValuesFromConfig();
 //   RegisterMyTests(values_to_test);
 //   ...
 //   return RUN_ALL_TESTS();
 // }
 //
 template <int&... ExplicitParameterBarrier, typename Factory>
 TestInfo* RegisterTest(const char* test_suite_name, const char* test_name,
                        const char* type_param, const char* value_param,
                        const char* file, int line, Factory factory) {
   using TestT = typename std::remove_pointer<decltype(factory())>::type;
 
   class FactoryImpl : public internal::TestFactoryBase {
    public:
     explicit FactoryImpl(Factory f) : factory_(std::move(f)) {}
     Test* CreateTest() override { return factory_(); }
 
    private:
     Factory factory_;
   };
 
   return internal::MakeAndRegisterTestInfo(
       test_suite_name, test_name, type_param, value_param,
       internal::CodeLocation(file, line), internal::GetTypeId<TestT>(),
       internal::SuiteApiResolver<TestT>::GetSetUpCaseOrSuite(file, line),
       internal::SuiteApiResolver<TestT>::GetTearDownCaseOrSuite(file, line),
       new FactoryImpl{std::move(factory)});
 }
 
 }  // namespace testing
 
 // Use this function in main() to run all tests.  It returns 0 if all
 // tests are successful, or 1 otherwise.
 //
 // RUN_ALL_TESTS() should be invoked after the command line has been
 // parsed by InitGoogleTest().
 //
 // This function was formerly a macro; thus, it is in the global
 // namespace and has an all-caps name.
 int RUN_ALL_TESTS() GTEST_MUST_USE_RESULT_;
 
 inline int RUN_ALL_TESTS() { return ::testing::UnitTest::GetInstance()->Run(); }
 
 GTEST_DISABLE_MSC_WARNINGS_POP_()  //  4251
 
 #endif  // GOOGLETEST_INCLUDE_GTEST_GTEST_H_

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