Can you pass in complex types into Parameterised Tests with Google Test?

Question

When passing values into a Parameterised Test using Google Test:

INSTANTIATE_TEST_SUITE_P(InstantiationName,
                         FooTest,
                         testing::Values("meeny", "miny", "moe"));

is there anyway to construct more c, such as a vector, before passing them into testing::Values?

Answer 1

You can pass many different types to the parametrized types, e.g. vector:

struct VectorTest : public testing::TestWithParam<std::vector<int>> {};

TEST_P(VectorTest, MyTestCase) {
    auto expectedVector = std::vector<int>{42, 314, 271, 161};
    ASSERT_EQ(expectedVector, GetParam());
}

INSTANTIATE_TEST_CASE_P(VectorInstantiationName,
                         VectorTest,
                         testing::Values(std::vector<int>{42, 314, 271, 161}));

or user-defined types:

struct MyParam {
    int i;
    std::string s;
};

struct MyTest : public testing::TestWithParam<MyParam> {};

TEST_P(MyTest, MyTestCase) {
    ASSERT_EQ(42, GetParam().i);
    ASSERT_EQ("foo", GetParam().s);
}

INSTANTIATE_TEST_CASE_P(InstantiationName,
                         MyTest,
                         testing::Values(MyParam{42, "foo"}));

(using INSTANTIATE_TEST_CASE_P as I'm on 1.8 currently; INSTANTIATE_TEST_SUITE_P shall be used for newer versions of gtest).