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Testing Exception Handling Behavior in Google Test Framework in Telegram

This test suite validates Google Test’s throw-on-failure mode functionality with exceptions enabled. It ensures proper exception handling and assertion behavior when Google Test is configured to throw exceptions on test failures.

Test Coverage Overview

The test coverage focuses on verifying the throw-on-failure mechanism in Google Test framework. Key areas tested include:

Successful assertion behavior (no exceptions thrown)
Failed assertion exception handling
Runtime error exception type verification
Exception message content validation

Implementation Analysis

The testing approach implements a standalone verification process outside of traditional Google Test patterns. It uses a custom failure reporting mechanism through the Fail() function instead of standard Google Test assertions to ensure independent validation.

The implementation specifically tests exception handling using try-catch blocks and validates both the exception type (std::runtime_error) and message content.

Technical Details

Testing tools and configuration:

Google Test framework with throw_on_failure flag enabled
Standard C++ exception handling
Custom failure reporting mechanism
Integration with std::runtime_error exception class

Best Practices Demonstrated

The test demonstrates several testing best practices:

Independent validation mechanism
Explicit exception type checking
Detailed error messaging
Isolation from Google Test’s own test execution framework
Proper cleanup and resource management

drklo/telegram

TMessagesProj/jni/boringssl/third_party/googletest/test/gtest_throw_on_failure_ex_test.cc

            
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// Tests Google Test's throw-on-failure mode with exceptions enabled.

#include "gtest/gtest.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdexcept>

// Prints the given failure message and exits the program with
// non-zero.  We use this instead of a Google Test assertion to
// indicate a failure, as the latter is been tested and cannot be
// relied on.
void Fail(const char* msg) {
  printf("FAILURE: %s\n", msg);
  fflush(stdout);
  exit(1);
}

// Tests that an assertion failure throws a subclass of
// std::runtime_error.
void TestFailureThrowsRuntimeError() {
  testing::GTEST_FLAG(throw_on_failure) = true;

  // A successful assertion shouldn't throw.
  try {
    EXPECT_EQ(3, 3);
  } catch(...) {
    Fail("A successful assertion wrongfully threw.");
  }

  // A failed assertion should throw a subclass of std::runtime_error.
  try {
    EXPECT_EQ(2, 3) << "Expected failure";
  } catch(const std::runtime_error& e) {
    if (strstr(e.what(), "Expected failure") != nullptr) return;

    printf("%s",
           "A failed assertion did throw an exception of the right type, "
           "but the message is incorrect.  Instead of containing \"Expected "
           "failure\", it is:\n");
    Fail(e.what());
  } catch(...) {
    Fail("A failed assertion threw the wrong type of exception.");
  }
  Fail("A failed assertion should've thrown but didn't.");
}

int main(int argc, char** argv) {
  testing::InitGoogleTest(&argc, argv);

  // We want to ensure that people can use Google Test assertions in
  // other testing frameworks, as long as they initialize Google Test
  // properly and set the thrown-on-failure mode.  Therefore, we don't
  // use Google Test's constructs for defining and running tests
  // (e.g. TEST and RUN_ALL_TESTS) here.

  TestFailureThrowsRuntimeError();
  return 0;
}