text: #ifndef TEST_ASSERT_H
  #define TEST_ASSERT_H
  
  #include "flatbuffers/base.h"
  #include "flatbuffers/util.h"
  
  // clang-format off
  
  #ifdef __ANDROID__
    #include <android/log.h>
    #define TEST_OUTPUT_LINE(...) \
        __android_log_print(ANDROID_LOG_INFO, "FlatBuffers", __VA_ARGS__)
    #define FLATBUFFERS_NO_FILE_TESTS
  #else
    #define TEST_OUTPUT_LINE(...) \
        do { printf(__VA_ARGS__); printf("\n"); } while(!IsConstTrue(true))
  #endif
  
  #define TEST_EQ(exp, val) TestEq(exp, val, "'" #exp "' != '" #val "'", __FILE__, __LINE__, "")
  #define TEST_ASSERT(val)  TestEq(true, !!(val), "'" "true" "' != '" #val "'", __FILE__, __LINE__, "")
  #define TEST_NOTNULL(val) TestEq(true, (val) != nullptr, "'" "nullptr" "' == '" #val "'", __FILE__, __LINE__, "")
  #define TEST_EQ_STR(exp, val) TestEqStr(exp, val, "'" #exp "' != '" #val "'", __FILE__, __LINE__, "")
  
  #ifdef _WIN32
    #define TEST_ASSERT_FUNC(val) TestEq(true, !!(val), "'" "true" "' != '" #val "'", __FILE__, __LINE__, __FUNCTION__)
    #define TEST_EQ_FUNC(exp, val) TestEq(exp, val, "'" #exp "' != '" #val "'", __FILE__, __LINE__, __FUNCTION__)
  #else
    #define TEST_ASSERT_FUNC(val) TestEq(true, !!(val), "'" "true" "' != '" #val "'", __FILE__, __LINE__, __PRETTY_FUNCTION__)
    #define TEST_EQ_FUNC(exp, val) TestEq(exp, val, "'" #exp "' != '" #val "'", __FILE__, __LINE__, __PRETTY_FUNCTION__)
  #endif
  
  // clang-format on
  
  extern int testing_fails;
  
  // Listener of TestFail, like 'gtest::OnTestPartResult' event handler.
  // Called in TestFail after a failed assertion.
  typedef bool (*TestFailEventListener)(const char *expval, const char *val,
                                        const char *exp, const char *file,
                                        int line, const char *func);
  
  // Prepare test engine (MSVC assertion setup, etc).
  // listener - this function will be notified on each TestFail call.
  void InitTestEngine(TestFailEventListener listener = nullptr);
  
  // Release all test-engine resources.
  // Prints or schedule a debug report if all test passed.
  // Returns 0 if all tests passed or 1 otherwise.
  // Memory leak report: FLATBUFFERS_MEMORY_LEAK_TRACKING && _MSC_VER && _DEBUG.
  int CloseTestEngine(bool force_report = false);
  
  // Write captured state to a log and terminate test run.
  void TestFail(const char *expval, const char *val, const char *exp,
                const char *file, int line, const char *func = 0);
  
  void TestEqStr(const char *expval, const char *val, const char *exp,
                 const char *file, int line, const char *func = 0);
  
  // Workaround for `enum class` printing.
  // There is an issue with the printing of enums with a fixed underlying type.
  // These enums are generated by `flatc` if `--scoped-enums` is active.
  // All modern compilers have problems with `std::stringstream&<<(T v)` if T is
  // an enum with fixed type. For details see DR1601:
  // http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1601
  // https://stackoverflow.com/questions/34336024/ambiguous-overload-when-writing-an-enum-with-an-enum-base-but-only-with-clang
  
  template<typename T, bool is_enum_type = flatbuffers::is_enum<T>::value>
  struct underlying_of_scalar {
    static_assert(flatbuffers::is_scalar<T>::value, "invalid type T");
    typedef T type;
  };
  
  template<typename T> struct underlying_of_scalar<T, true> {
  // clang-format off
    // There are old compilers without full C++11 support (see stl_emulation.h).
    #if defined(FLATBUFFERS_TEMPLATES_ALIASES) && !defined(FLATBUFFERS_CPP98_STL)
    using type = typename std::underlying_type<T>::type;
    #else
    typedef int64_t type;
    #endif
    // clang-format on
  };
  
  template<typename T>
  typename underlying_of_scalar<T>::type scalar_as_underlying(T v) {
    return static_cast<typename underlying_of_scalar<T>::type>(v);
  }
  
  template<typename T, typename U>
  void TestEq(T expval, U val, const char *exp, const char *file, int line,
              const char *func) {
    if (static_cast<U>(expval) != val) {
      TestFail(flatbuffers::NumToString(scalar_as_underlying(expval)).c_str(),
               flatbuffers::NumToString(scalar_as_underlying(val)).c_str(), exp,
               file, line, func);
    }
  }
  
  template<>
  inline void TestEq<std::string, std::string>(std::string expval,
                                               std::string val, const char *exp,
                                               const char *file, int line,
                                               const char *func) {
    if (expval != val) {
      TestFail(expval.c_str(), val.c_str(), exp, file, line, func);
    }
  }
  
  #endif  // !TEST_ASSERT_H
  