C++ Google Type-Parameterized and Value-Parameterized Tests combined?

Question

I would like to be able to parameterize my tests for various types through the following code snippet:

template <typename T>
class MyTestSuite : public testing::TestWithParam<tuple<T, vector<vector<T>>, T, T>>
{
public:
    MyTestSuite()
    {
        _var = get<0>(GetParam());
        // and the rest of the test params
    }
protected:
    T _var;
};
TYPED_TEST_SUITE_P(MyTestSuite);
TYPED_TEST_P(MyTestSuite, MyTests)
{
    ASSERT_EQ(this->_expected, this->DoSomething(this->_var));
}
REGISTER_TYPED_TEST_SUITE_P(MyTestSuite,
                            MyTests);
using MyTypes = ::testing::Types<size_t>;
INSTANTIATE_TYPED_TEST_SUITE_P(
    MyGroup,
    MyTestSuite,
    ::testing::Combine(
        ::testing::Values(4, vector<vector<size_t>>{{1, 2}, {1, 3}, {3, 4}}, 1, 1),
        ::testing::Values(10, vector<vector<size_t>>{{1, 2}, {1, 3}, {3, 4}}, 1, 2),
        ::testing::Values(20, vector<vector<size_t>>{{1, 2}, {1, 3}, {3, 4}}, 1, 4)));

and bump into the following compilation error:

error: there are no arguments to ‘GetParam’ that depend on a template parameter, so a declaration of ‘GetParam’ must be available [-fpermissive]
[build]   284 |                 _var = get<0>(GetParam());

This post has been quite some time: Google Test: Is there a way to combine a test which is both type parameterized and value parameterized? Is it still not possible to kill these 2 birds with one stone, judging from the compilation error above?

Boaster

Please post a minimal reproducible example. Why do we have to edit your code to get it compiled? The first error is error: use of undeclared identifier 'testing'. Plus other 20 errors. – Moye

Answer 1

Decided to use a template base test fixture class with parameterized tests:

template <typename T>
class MyTestFixture
{
protected:
   void SetUp(...) {}
   T _var;
};
class MyTestSuite1 : public MyTestFixture<size_t>, public testing::TestWithParam<tuple<size_t, vector<vector<size_t>>, size_t, size_t>>
{
public:
    void SetUp() override
    {
        MyTestFixture::SetUp(get<0>(GetParam()));
        // and the rest of the test params
    }
};
class MyTestSuite2 : public MyTestFixture<long>, public testing::TestWithParam<tuple<size_t, vector<vector<long>>, size_t, long>>
{
public:
    void SetUp() override
    {
        MyTestFixture::SetUp(get<0>(GetParam()));
        // and the rest of the test params
    }
};

TEST_P(MyTestSuite1, MyTests1)
{
    ASSERT_EQ(this->_expected, this->DoSomething(this->_var));
}
TEST_P(MyTestSuite2, MyTests2)
{
    ASSERT_EQ(this->_expected, this->DoSomething(this->_var));
}
INSTANTIATE_TEST_SUITE_P(
    MyGroup,
    MyTestSuite1,
    ::testing::Values(make_tuple<size_t, ...>(4, vector<vector<size_t>>{{1, 2}, {1, 3}, {3, 4}}, 1, 1),
        make_tuple<size_t, ...>(10, vector<vector<size_t>>{{1, 2}, {1, 3}, {3, 4}}, 1, 2),
        make_tuple<size_t, ...>(20, vector<vector<size_t>>{{1, 2}, {1, 3}, {3, 4}}, 1, 4)));

Boaster