Google Test: Parameterized tests which use an existing test fixture class?
Solution 1
The problem is that for regular tests your fixture has to be derived from testing::Test and for parameterized tests, it has to be derived from testing::TestWithParam<>.
In order to accommodate that, you'll have to modify your fixture class in order to work with your parameter type
template <class T> class MyFixtureBase : public T {
void SetUp() { ... };
// Put the rest of your original MyFixtureTest here.
};
// This will work with your non-parameterized tests.
class MyFixtureTest : public MyFixtureBase<testing::Test> {};
// This will be the fixture for all your parameterized tests.
// Just substitute the actual type of your parameters for MyParameterType.
class MyParamFixtureTest : public MyFixtureBase<
testing::TestWithParam<MyParameterType> > {};
This way you can keep all your existing tests intact while creating parameterized tests using
TEST_P(MyParamFixtureTest, MyTestName) { ... }
Solution 2
This question is now answered in the Google Test documentation (the answer from VladLosev is technically correct, but perhaps slightly more work)
Specifically, when you want to add parameters to a pre-existing fixture class, you can do
class MyFixtureTest : public ::testing::Test {
...
};
class MyParamFixtureTest : public MyFixtureTest,
public ::testing::WithParamInterface<MyParameterType> {
...
};
TEST_P(MyParamFixtureTest, MyTestName) { ... }
des4maisons
Updated on July 14, 2022Comments
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des4maisons almost 2 years
I have a test fixture class which is currently used by many tests.
#include <gtest/gtest.h> class MyFixtureTest : public ::testing::Test { void SetUp() { ... } };
I would like to create a parameterized test which also uses all that MyFixtureTest has to offer, without needing to change all my existing tests.
How do I do that?
I have found similar discussions on the web, but have not fully understood their answers.