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()?

Doesn't the documentation explain this?

Kerrek SB
– Kerrek SB

2018-01-14 16:49:03 +00:00
Commented Jan 14, 2018 at 16:49 — Kerrek SB
– Kerrek SB, Commented Jan 14, 2018 at 16:49

AliaumeM · Accepted Answer · 2018-01-14 17:36:32Z

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()

answered Jan 14, 2018 at 17:36

AliaumeM

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6 Comments

ruipacheco Over a year ago

I don't want to create a constructor for my POD. Is it possible to create the object in place?

AliaumeM Over a year ago

This is what the aggregate construction does in my example. Assuming your type is defined as this: struct parameters { std::string username; std::string host; }; You can simply construct an instance by writing parameters{"username", "192.168.0.254"}

AliaumeM Over a year ago

cf this cppreference page

ruipacheco Over a year ago

I can get aggregate initialisers to work in general, just not on Google test.

AliaumeM Over a year ago

I just tried it on a simple example, and it works for me. What compiler are you using? Have you passed any flag to it to enable at least C++11 in your test project? What is the actual error message?

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