How to write tests for Either<> from dartz package in flutter-CodePudding

I am trying to write unit tests for a flutter app and Can't get this one test case appropriate

checkout the function returning : Future<Either<WeatherData, DataError>>

  @override Future<Either<WeatherData, DataError>> fetchWeatherByCity({required String city}) async {
try {
  var response = await apiService.fetchWeatherByCity(city: city);
  if (response.statusCode == 200) {
    return Left(WeatherData.fromJson(jsonDecode(response.body)));
  } else {
    return Right(DataError(title: "Error", description: "Desc", code: 0, url: "NoUrl"));
  }
} catch (error) {
  AppException exception = error as AppException;
  return Right(DataError(
      title: exception.title, description: exception.description, code: exception.code, url: exception.url));
}}

Here is the code where I am trying to write unit test for same,

sut = WeatherRepositoryImpl(apiService: mockWeatherApiService);
test(
  "get weather by city DataError 1 - Error 404 ",
  () async {
    when(mockWeatherApiService.fetchWeatherByCity(city: "city"))
        .thenAnswer((_) async => Future.value(weatherRepoMockData.badResponse));
    final result = await sut.fetchWeatherByCity(city: "city");
    verify(mockWeatherApiService.fetchWeatherByCity(city: "city")).called(1);
    expect(result, isInstanceOf<DataError>);
    verifyNoMoreInteractions(mockWeatherApiService);
  },
);

and when I run this specific test, I receive this error

Expected: <Instance of 'DataError'>
Actual: Right<WeatherData, DataError>:<Right(Instance of 'DataError')>
Which: is not an instance of 'DataError'

What I am not getting here?? What should I be expecting from the function for the test to pass successfully?

CodePudding user response：

You need to either make the expected value a Right(), or extract the right side of the actual value. Doing either of those will match, but as it is, you're comparing a wrapped value with an unwrapped value.

CodePudding user response：

You are directly using the result which is actually a wrapper and has a type of Either<WeatherData, DataError>.

You need to unwrap the value using the fold method on the result and then expect accordingly, So in your code you can do something like this to make it work:

final result = await sut.fetchWeatherByCity(city: "city");

result.fold(
(left) => fail('test failed'), 
(right) {
  expect(result, isInstanceOf<DataError>);
});
verifyNoMoreInteractions(mockWeatherApiService);

Hope this helps.