diff --git a/tests/test_assert.h b/tests/test_assert.h
new file mode 100644
index 0000000..883586b
--- /dev/null
+++ b/tests/test_assert.h
@@ -0,0 +1,68 @@
+#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(...) \
+      { printf(__VA_ARGS__); printf("\n"); }
+#endif
+
+#define TEST_EQ(exp, val) TestEq(exp, val, #exp, __FILE__, __LINE__)
+#define TEST_ASSERT(exp) TestEq(exp, true, #exp, __FILE__, __LINE__)
+#define TEST_NOTNULL(exp) TestEq(exp == NULL, false, #exp, __FILE__, __LINE__)
+#define TEST_EQ_STR(exp, val) TestEqStr(exp, val, #exp, __FILE__, __LINE__)
+
+#ifdef _WIN32
+  #define TEST_ASSERT_FUNC(exp) TestEq(exp, true, #exp, __FILE__, __LINE__, __FUNCTION__)
+  #define TEST_EQ_FUNC(exp, val) TestEq(exp, val, #exp, __FILE__, __LINE__, __FUNCTION__)
+#else
+  #define TEST_ASSERT_FUNC(exp) TestEq(exp, true, #exp, __FILE__, __LINE__, __PRETTY_FUNCTION__)
+  #define TEST_EQ_FUNC(exp, val) TestEq(exp, val, #exp, __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);
+
+template<typename T, typename U>
+void TestEq(T expval, U val, const char *exp, const char *file, int line,
+            const char *func = 0) {
+  if (U(expval) != val) {
+    TestFail(flatbuffers::NumToString(expval).c_str(),
+             flatbuffers::NumToString(val).c_str(), exp, file, line, func);
+  }
+}
+
+#endif  // !TEST_ASSERT_H