如何在Google Test中断言执行时间？

Question

I am using Google's C++ testing framework Gtest. I would like to test a function against its execution time, eg function foo() fails if its execution is longer than 3ms. I could not find an ASSERT statement to achieve this. Does gtest not include such a feature ?

Answer 1

Why not to use such simple solution?

//pseudo code
clock_t t = clock();
foo();
const double work_time = (clock() - t) / double(CLOCKS_PER_SEC);
ASSERT_TRUE(work_time <= 0.003);

Answer 2

由于错误仍然存​​在，可能不存在： http ： //code.google.com/p/googletest/issues/detail？id = 348

Answer 3

I found a way to use the stats that GoogleTest prints out for this. This is at the program level, but you could probably do the same in TearDownTestCase() to sanity check speed in a subset. This is because there is a TestCase-level elapsed_time member function.

int main(int argc, char* argv[])
{
    ::testing::InitGoogleTest(&argc, argv);
    auto result(RUN_ALL_TESTS());
    ::testing::internal::TimeInMillis elapsed(
        ::testing::UnitTest::GetInstance()->elapsed_time());
    ASSERT_LT(elapsed, measurePerf ? 180 * 1000 : 215 * 1000);
    return result;
}

Representative results:

[==========] 338 tests from 18 test cases ran. (207723 ms total) [ PASSED ] 338 tests.

YOU HAVE 13 DISABLED TESTS

FrameworkTest.cpp(39): error: Expected: (elapsed) < (measurePerf ? 190 * 1000 : 170 * 1000), actual: 207723 vs 170000