Is it possible to run each testcase in a separate process?

Question

Is it possible to run each testcase in a separate process other than a single process?

It seems that gtest itself does not intend to support this feature.

As I did a test and I found all the testcases are run in the same thread. Here is the said code snippet:

TEST(TestSuitNameA, TestCaseName)
{
  std::cout << std::this_thread::get_id() << std::endl;
}

TEST(TestSuitNameB, TestCaseName)
{
  std::cout << std::this_thread::get_id() << std::endl;
}

Answer 1

Here is a hack that you can use: force each test to die at the end.

Say you want to test a function called MyFunction, you can then wrap it in another function called MyFunctionTester which exits with code 0 if the test passes and 1 otherwise. Then in your test, use EXPECT_EXIT.

Here is a quick example:

int MyFunction(int a){
    return a+1;
}

void MyFunctionTester(int a){
    auto actual = MyFunction(a);
    std::cout << "actual: " << actual << std::endl;
    _exit(actual);
}

TEST(TestSuitNameA, TestCaseName)
{
  GTEST_FLAG_SET(death_test_style, "threadsafe");
  std::cout << "  thread id: " << std::this_thread::get_id() << std::endl;
  EXPECT_EXIT(MyFunctionTester(1), testing::ExitedWithCode(2), "");
}

TEST(TestSuitNameB, TestCaseName)
{
  GTEST_FLAG_SET(death_test_style, "threadsafe");
  std::cout << "  thread id: " << std::this_thread::get_id() << std::endl;
  EXPECT_EXIT(MyFunctionTester(2), testing::ExitedWithCode(3), "");
}

Live example here: https://godbolt.org/z/WrWz67jhG

Please notice that this is really a hack and far from ideal, but it seems to work.

See here for more info on death tests.