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@ -587,47 +587,10 @@ namespace internal {
EXPECT_TRUE(internal::Func(12345));
}}}
== I have an existing C++ Google Test test that I now would like to run twice with two values of an external variable. Is there a good way to test it without defining the test twice? ==
Yes! You can use a feature in Google Test called value-parameterized tests
which lets you repeat your tests with a number of different parameters.
First, define your fixture. Derive it from `testing::TestWithParam<T>`,
where `T` is your parameter type. In `SetUp()` or the fixture constructor, you
initialize your flag with the parameter value obtained from the
`GetParam()` method:
{{{
class FooTest : public testing::TestWithParam<int32> {
protected:
virtual void SetUp() { external_parameter = GetParam(); }
};
}}}
Now, define your tests as usual. The only difference is you'll be
using the `TEST_P` macro instead of `TEST_F` (P stands for
"parameterized".):
{{{
TEST_P(FooTest, TestBlah) {
... // Tested code that depends on external_parameter goes here.
}
}}}
And finally, instantiate tests in the `FooTest` test case with the
values you want:
{{{
INSTANTIATE_TEST_CASE_P(InstantiationName, FooTest, testing::Values(1, 2, 3));
}}}
`InstantiationName` is used to identify this particular instantiation
(you can instantiate a test case many times with different value lists).
Each test in your test case will be run with each parameter value you
have specified, and the results will be reported separately for each
test/parameter combination.
== I would like to run a test several times with different parameters. Do I need to write several similar copies of it? ==
No. You can use a feature called [GoogleTestAdvancedGuide#Value_Parameterized_Tests value-parameterized tests] which
lets you repeat your tests with a number of different parameters.
== How do I test a file that defines main()? ==
@ -661,6 +624,7 @@ test. For example:
...
}}}
However, please remember this is a hack and should only be used as the last
resort.