public void UserRolesServiceTest_FindUsersByRole_WhenWriter_AlwaysReturnsNully()
{
var svc = new UserRolesService();
var actual = svc.FindUsersByRole("writer");
Assert.Null(actual); // No writers allowed
}
public void UserRolesServiceTest_FindUsersByRole_Always_Iterable()
{
var svc = new UserRolesService();
var actual = svc.FindUsersByRole("writer");
// oops, I cant iterate over null!
Assert.IsAssignableFrom <IEnumerable <string> >(actual);
}