How to use parameterized test cases?

Question

I'm trying to use parameterized tests with a class that takes a POD as parameter. I've sort of reached this stage:

struct TestParameters : public ::testing::TestWithParam<parameters> {
  parameters params;

  virtual void SetUp() {
    params.username = "username";
    params.host = "192.168.0.254";
  }
};

TEST_P(TestParameters, connect) {
  std::error_code ec;
  std::unique_ptr<connection> connection = make_connection(GetParam(), ec);
  ASSERT_FALSE(ec);
  ec = connection->connect();
  ASSERT_FALSE(ec);
}

INSTANTIATE_TEST_CASE_P(postgresql_tcp, connection, ::testing::Values());

My question is, how to pass the values I need in parameters via INSTANTIATE_TEST_CASE_P and how to I pass a valid instance of parameters to make_connection() ?

Answer 1

It looks like you should be doing something along the lines of

INSTANTIATE_TEST_CASE_P(postgresql_tcp, connect,
                        ::testing::Values(parameters{"username", "192.168.0.254"}
                                      //, parameters{ other params here }
                                          ));

Or you could declare a std::vector<parameters> as a global somewhere that you dynamically could compute, and then pass iterators of that vector to ::testing::Values()

Also, note you wouldn't need the member params in your fixture class, since the parameter is going to be fed automatically by Google Test through GetParam()