example_of_test_factory.cs

[Test, TestCaseSource(typeof(OneNineTwoTestFactory), nameof(OneNineTwoTestFactory.CustomersThatCanBeVerified))]
public void given_an_idverification_request_that_should_return_positive(OneNineTwoRequest oneNineTwoRequest)
{
  given_a_one_nine_two_request(oneNineTwoRequest);

  when_an_id_verification_via_oneNineTwo_is_made();
  
  then_it_should_successfully_verify_id();
}

public static IEnumerable CustomersThatCanBeVerified
{
  get
  {
    foreach (var customer in Customers)
    {
      var country = GetCountry(customer.AddressAlpha2IsoCountryCode); //what is happening here?
      var oneNineTwoRequest = new OneNineTwoRequest(customer, country, OneNineTwoServiceConfiguration); //and here?
      yield return new TestCaseData(oneNineTwoRequest).
      SetName("It_should_return_positive_for_"+ country.Alpha3IsoCountryCode + "_customer");
    }
  }
}