How to check if the test failed in Google Test TearDown()? - googletest

Question

At the end of every "file based integration" test, I want to clear a temp folder of associated files.
If the test fails, I want to leave the files there, so I can review the unexpected output.
Is there a way in the Google Test TearDown to check if the test has failed?

Answer 1

Is there a way in the Google Test TearDown to check if the test has failed?
Yes, you can do that be querying ::testing::Test::HasFailure() in
the test cases of your fixture and using the result to tally failures in a counter member of
the fixture that can be queried in its TearDown(). An elementary example:
#include <gtest/gtest.h>
#include <iostream>
struct Fixture : public ::testing::Test {
virtual void SetUp() {
fails = 0;
}
virtual void TearDown() {
if (fails > 0) {
std::cerr << "Fixture::TearDown sees failures" << std::endl;
}
}
unsigned fails;
};
TEST_F(Fixture, foo) {
EXPECT_EQ(1,0);
fails += ::testing::Test::HasFailure();
}
TEST_F(Fixture, bar) {
EXPECT_EQ(1,1);
fails += ::testing::Test::HasFailure();
}
int main(int argc, char **argv) {
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
And output:
[==========] Running 2 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 2 tests from Fixture
[ RUN ] Fixture.foo
/home/imk/dev/so/gtest/main.cpp:19: Failure
Expected: 1
To be equal to: 0
Fixture::TearDown sees failures
[ FAILED ] Fixture.foo (0 sec)
[ RUN ] Fixture.bar
[ OK ] Fixture.bar (0 sec)
[----------] 2 tests from Fixture (0.001 sec total)
[----------] Global test environment tear-down
[==========] 2 tests from 1 test case ran. (1 ms total)
[ PASSED ] 1 test.
[ FAILED ] 1 test, listed below:
[ FAILED ] Fixture.foo
1 FAILED TEST

Answer 2

Simplified and updated version of #mike-kinghan's answer.
Still using the ::testing::Test::HasFailure() but without the counter (it will always evaluate to 1 since the HasFailure() retuens a boolean)
#include <gtest/gtest.h>
#include <iostream>
struct Fixture : public ::testing::Test {
virtual void SetUp() {}
virtual void TearDown() {
if (::testing::Test::HasFailure()) {
std::cerr << "Fixture::TearDown sees failures" << std::endl;
} else {
std::cout << "Fixture::TearDown sees NO failures" << std::endl;
}
}
};
TEST_F(Fixture, foo) { EXPECT_EQ(0, 0); }
TEST_F(Fixture, bar) { EXPECT_EQ(1, 0); }
TEST_F(Fixture, car) { EXPECT_EQ(2, 2); }
TEST_F(Fixture, tar) { EXPECT_EQ(3, 0); }
Output: