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Create implementation endpoint getTopHeadlineNews 
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‎lib/feature/data/repository/news/news_repository_impl.dart

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import 'package:dartz/dartz.dart';
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import 'package:dio/dio.dart';
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import 'package:flutter_news_app/core/error/failure.dart';
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import 'package:flutter_news_app/core/network/network_info.dart';
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import 'package:flutter_news_app/core/util/enum/top_headline_news_category.dart';
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import 'package:flutter_news_app/feature/data/datasource/news/news_remote_data_source.dart';
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import 'package:flutter_news_app/feature/data/model/news/news_response.dart';
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import 'package:flutter_news_app/feature/___domain/repository/news/news_repository.dart';
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class NewsRepositoryImpl implements NewsRepository {
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final NewsRemoteDataSource newsRemoteDataSource;
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final NetworkInfo networkInfo;
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NewsRepositoryImpl({
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required this.newsRemoteDataSource,
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required this.networkInfo,
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});
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@override
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Future<Either<Failure, NewsResponse>> getTopHeadlineNews(
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TopHeadlineNewsCategory topHeadlineNewsCategory,
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) async {
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final isConnected = await networkInfo.isConnected;
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if (isConnected) {
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try {
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final response = await newsRemoteDataSource.getTopHeadlineNews(topHeadlineNewsCategory);
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return Right(response);
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} on DioError catch (error) {
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return Left(ServerFailure(error.message));
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} on TypeError catch (error) {
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return Left(ParsingFailure(error.toString()));
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}
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} else {
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return Left(ConnectionFailure());
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}
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}
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}

‎lib/feature/___domain/repository/news/news_repository.dart

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import 'package:dartz/dartz.dart';
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import 'package:flutter_news_app/core/error/failure.dart';
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import 'package:flutter_news_app/core/util/enum/top_headline_news_category.dart';
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import 'package:flutter_news_app/feature/data/model/news/news_response.dart';
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abstract class NewsRepository {
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Future<Either<Failure, NewsResponse>> getTopHeadlineNews(TopHeadlineNewsCategory topHeadlineNewsCategory);
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}

‎test/feature/data/repository/news/news_repository_impl_test.dart

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import 'dart:convert';
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import 'package:dartz/dartz.dart';
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import 'package:dio/dio.dart';
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import 'package:flutter_news_app/core/error/failure.dart';
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import 'package:flutter_news_app/core/util/enum/top_headline_news_category.dart';
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import 'package:flutter_news_app/feature/data/model/news/news_response.dart';
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import 'package:flutter_news_app/feature/data/repository/news/news_repository_impl.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:mockito/mockito.dart';
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import '../../../../fixture/fixture_reader.dart';
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import '../../../../helper/mock_helper.mocks.dart';
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void main() {
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late NewsRepositoryImpl newsRepositoryImpl;
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late MockNewsRemoteDataSource mockNewsRemoteDataSource;
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late MockNetworkInfo mockNetworkInfo;
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setUp(() {
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mockNewsRemoteDataSource = MockNewsRemoteDataSource();
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mockNetworkInfo = MockNetworkInfo();
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newsRepositoryImpl = NewsRepositoryImpl(
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newsRemoteDataSource: mockNewsRemoteDataSource,
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networkInfo: mockNetworkInfo,
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);
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});
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final tRequestOptions = RequestOptions(path: '');
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void setUpMockNetworkConnected() {
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when(mockNetworkInfo.isConnected).thenAnswer((_) async => true);
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}
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void setUpMockNetworkDisconnected() {
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when(mockNetworkInfo.isConnected).thenAnswer((_) async => false);
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}
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void testDisconnected(Function endpointInvoke) {
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test(
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'Should return ConnectionFailure while device is not connected to the internet',
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() async {
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// arrange
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setUpMockNetworkDisconnected();
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// act
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final result = await endpointInvoke.call();
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// assert
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verify(mockNetworkInfo.isConnected);
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expect(result, Left(ConnectionFailure()));
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},
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);
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}
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void testParsingFailure(Function whenInvoke, Function actInvoke, Function verifyInvoke) {
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test(
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'Should return ParsingFailure while NewsRemoteDataSource failure parsing response JSON from the endpoint',
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() async {
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// arrange
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setUpMockNetworkConnected();
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when(whenInvoke.call()).thenThrow(TypeError());
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// act
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final result = await actInvoke.call();
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// assert
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verify(verifyInvoke.call());
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expect(result, Left(ParsingFailure(TypeError().toString())));
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},
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);
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}
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group('getTopHeadlineNews', () {
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const tTopHeadlineNewsCategory = TopHeadlineNewsCategory.general;
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final tResponse = NewsResponse.fromJson(
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json.decode(
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fixture('news_response.json'),
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),
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);
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test(
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'Should return NewsResponse while NewsRemoteDataSoure retrieve response success from the endpoint',
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() async {
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// arrange
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setUpMockNetworkConnected();
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when(mockNewsRemoteDataSource.getTopHeadlineNews(any)).thenAnswer((_) async => tResponse);
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// act
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final result = await newsRepositoryImpl.getTopHeadlineNews(tTopHeadlineNewsCategory);
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// assert
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verify(mockNewsRemoteDataSource.getTopHeadlineNews(tTopHeadlineNewsCategory));
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expect(result, Right(tResponse));
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},
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);
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test(
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'Should return ServerFailure while NewsRemoteDataSource retrieve timeout response from the endpoint',
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() async {
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// arrange
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setUpMockNetworkConnected();
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when(mockNewsRemoteDataSource.getTopHeadlineNews(any)).thenThrow(
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DioError(
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requestOptions: tRequestOptions,
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error: 'testError',
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),
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);
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// act
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final result = await newsRepositoryImpl.getTopHeadlineNews(tTopHeadlineNewsCategory);
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// assert
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verify(mockNewsRemoteDataSource.getTopHeadlineNews(tTopHeadlineNewsCategory));
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expect(result, Left(ServerFailure('testError')));
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},
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);
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test(
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'Should return ServerFailure while NewsRemoteDataSource retrieve failure response from the endpoint',
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() async {
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// arrange
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setUpMockNetworkConnected();
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when(mockNewsRemoteDataSource.getTopHeadlineNews(any)).thenThrow(
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DioError(
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requestOptions: tRequestOptions,
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error: 'testError',
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response: Response(
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requestOptions: tRequestOptions,
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statusCode: 400,
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),
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),
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);
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// act
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final result = await newsRepositoryImpl.getTopHeadlineNews(tTopHeadlineNewsCategory);
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// assert
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verify(mockNewsRemoteDataSource.getTopHeadlineNews(tTopHeadlineNewsCategory));
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expect(result, Left(ServerFailure('testError')));
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},
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);
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testParsingFailure(
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() => mockNewsRemoteDataSource.getTopHeadlineNews(any),
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() => newsRepositoryImpl.getTopHeadlineNews(tTopHeadlineNewsCategory),
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() => mockNewsRemoteDataSource.getTopHeadlineNews(tTopHeadlineNewsCategory),
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);
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testDisconnected(() => newsRepositoryImpl.getTopHeadlineNews(tTopHeadlineNewsCategory));
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});
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}

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