Flutter: testing

Question

I was trying to test this function

  UserApi createUserApi(String url, String username, String password) {
    UserApi userApi = new UserApi(base: route(url), serializers: repo);
    userApi.base.basicAuth('$username', '$password');
    return userApi;
  }

basically, the test was to compare the result of this function with a "manually composition" of it, expecting to have the same result. But It doesn't:

  String username = "asd";
  String password = "asd";
  UserApi userApiTest = new UserApi(base: route("asd"), serializers: repo);
  userApiTest.base.basicAuth('$username', '$password');
  test("UserApi creation", () {
    UserApi userApi = _presenter.createUserApi("asd", "asd", "asd");
    expect(userApi, userApiTest);
  });

The result is always :

Expected: <Instance of 'UserApi'>
  Actual: <Instance of 'UserApi'>

Why are they different? In the debug every property is the same.

Günter Zöchbauer · Accepted Answer · 2018-10-02 06:21:07Z

8

You have two different instances of UserApi. Them having the same property values does not make them equal.

You would need to implement hashCode and operator==. By default only comparing the references to the same instance of an object are considered equal (because they are identical)

7 Comments

Little Monkey Over a year ago

Sorry, if I ask a stupid question, but so I should override the == method in the class that I want to test?

Günter Zöchbauer Over a year ago

If you want meaningful results for == with instances of your custom classes, then yes, you need to override operator == and hashCode.

Günter Zöchbauer Over a year ago

expect(userApi, userApiTest); is executed as expect(userApi, equals(userApiTest)); which uses == to check equality. So your test is fine besides the missing operator == and get hashCode => ...

Little Monkey Over a year ago

yes, I've just tried. I had also some other problems, but now it works. Thank you a lot!

Rodrigo Manguinho Over a year ago

Thats really sad that a new language has to do all this ugly code manually to simple compare 2 objects. Any modern language allows to compare objects.

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