Create use case get_top_headline_news.dart

Author: CoderJava

lib/feature/___domain/use_case/get_top_headline_news/get_top_headline_news.dart

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+import 'package:dartz/dartz.dart';
+import 'package:equatable/equatable.dart';
+import 'package:flutter_news_app/core/error/failure.dart';
+import 'package:flutter_news_app/core/use_case/use_case.dart';
+import 'package:flutter_news_app/core/util/enum/top_headline_news_category.dart';
+import 'package:flutter_news_app/feature/data/model/news/news_response.dart';
+import 'package:flutter_news_app/feature/___domain/repository/news/news_repository.dart';
+
+class GetTopHeadlineNews implements UseCase<NewsResponse, ParamsGetTopHeadlineNews> {
+  final NewsRepository newsRepository;
+
+  GetTopHeadlineNews(this.newsRepository);
+
+  @override
+  Future<Either<Failure, NewsResponse>> call(params) {
+    return newsRepository.getTopHeadlineNews(params.topHeadlineNewsCategory);
+  }
+}
+
+class ParamsGetTopHeadlineNews extends Equatable {
+  final TopHeadlineNewsCategory topHeadlineNewsCategory;
+
+  const ParamsGetTopHeadlineNews({required this.topHeadlineNewsCategory});
+
+  @override
+  List<Object?> get props => [
+    topHeadlineNewsCategory,
+  ];
+
+  @override
+  String toString() {
+    return 'ParamsGetTopHeadlineNews{topHeadlineNewsCategory: $topHeadlineNewsCategory}';
+  }
+}

test/feature/___domain/use_case/get_top_headline_news/get_top_headline_news_test.dart

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+import 'dart:convert';
+
+import 'package:dartz/dartz.dart';
+import 'package:flutter_news_app/core/util/enum/top_headline_news_category.dart';
+import 'package:flutter_news_app/feature/data/model/news/news_response.dart';
+import 'package:flutter_news_app/feature/___domain/use_case/get_top_headline_news/get_top_headline_news.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/mockito.dart';
+
+import '../../../../fixture/fixture_reader.dart';
+import '../../../../helper/mock_helper.mocks.dart';
+
+void main() {
+  late GetTopHeadlineNews useCase;
+  late MockNewsRepository mockNewsRepository;
+
+  setUp(() {
+    mockNewsRepository = MockNewsRepository();
+    useCase = GetTopHeadlineNews(mockNewsRepository);
+  });
+
+  const tTopHeadlineNewsCategory = TopHeadlineNewsCategory.general;
+  const tParams = ParamsGetTopHeadlineNews(topHeadlineNewsCategory: tTopHeadlineNewsCategory);
+
+  test(
+    'Make sure repository receive success and failure response from the endpoint getTopHeadlineNews',
+    () async {
+      // arrange
+      final tResponse = NewsResponse.fromJson(
+        json.decode(
+          fixture('news_response.json'),
+        ),
+      );
+      when(mockNewsRepository.getTopHeadlineNews(any)).thenAnswer((_) async => Right(tResponse));
+
+      // act
+      final result = await useCase(tParams);
+
+      // assert
+      expect(result, Right(tResponse));
+      verify(mockNewsRepository.getTopHeadlineNews(tTopHeadlineNewsCategory));
+      verifyNoMoreInteractions(mockNewsRepository);
+    },
+  );
+
+  test(
+    'Make sure the output from props function class params',
+    () async {
+      // assert
+      expect(
+        tParams.props,
+        [
+          tParams.topHeadlineNewsCategory,
+        ],
+      );
+    },
+  );
+
+  test(
+    'Make sure the output from toString function class params',
+    () async {
+      // assert
+      expect(
+        tParams.toString(),
+        'ParamsGetTopHeadlineNews{topHeadlineNewsCategory: ${tParams.topHeadlineNewsCategory}}',
+      );
+    },
+  );
+}