Create news remote data source

Author: CoderJava

lib/config/base_url_config.dart

@@ -1,4 +1,4 @@
 class BaseUrlConfig {
-  final String baseUrlDevelopment = 'https://bengkelrobot.net:8003/v2';
-  final String baseUrlProduction = 'https://newsapi.org/v2';
+  final String baseUrlDevelopment = 'https://bengkelrobot.net:8003';
+  final String baseUrlProduction = 'https://newsapi.org';
 }

lib/config/constant_config.dart

@@ -0,0 +1,3 @@
+class ConstantConfig {
+  final String apiKeyNewsApi = '3f1bdb0927c94f8da5708f7a36f7d06f';
+}

lib/feature/data/datasource/news/news_remote_data_source.dart

@@ -0,0 +1,37 @@
+import 'package:dio/dio.dart';
+import 'package:flutter_news_app/config/constant_config.dart';
+import 'package:flutter_news_app/feature/data/model/topheadlinesnews/top_headlines_news_response_model.dart';
+import 'package:meta/meta.dart';
+
+abstract class NewsRemoteDataSource {
+  /// Calls the baseUrl:/v2/top-headlines?country=:country&apiKey=:apiKey endpoint
+  ///
+  /// Throws a [DioError] for all error codes.
+  Future<TopHeadlinesNewsResponseModel> getTopHeadlinesNews();
+}
+
+class NewsRemoteDataSourceImpl implements NewsRemoteDataSource {
+  final Dio dio;
+  final ConstantConfig constantConfig;
+
+  NewsRemoteDataSourceImpl({
+    @required this.dio,
+    @required this.constantConfig,
+  });
+
+  @override
+  Future<TopHeadlinesNewsResponseModel> getTopHeadlinesNews() async {
+    var response = await dio.get(
+      '/v2/top-headlines',
+      queryParameters: {
+        'country': 'id',
+        'apiKey': constantConfig.apiKeyNewsApi,
+      },
+    );
+    if (response.statusCode == 200) {
+      return TopHeadlinesNewsResponseModel.fromJson(response.data);
+    } else {
+      throw DioError();
+    }
+  }
+}

test/feature/data/datasource/news/news_remote_data_source_test.dart

@@ -0,0 +1,117 @@
+import 'dart:convert';
+
+import 'package:dio/dio.dart';
+import 'package:flutter_news_app/config/base_url_config.dart';
+import 'package:flutter_news_app/config/constant_config.dart';
+import 'package:flutter_news_app/feature/data/datasource/news/news_remote_data_source.dart';
+import 'package:flutter_news_app/feature/data/model/topheadlinesnews/top_headlines_news_response_model.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:matcher/matcher.dart';
+import 'package:mockito/mockito.dart';
+
+import '../../../../fixture/fixture_reader.dart';
+
+class MockDioAdapter extends Mock implements HttpClientAdapter {}
+
+class MockDio extends Mock implements Dio {}
+
+void main() {
+  NewsRemoteDataSourceImpl newsRemoteDataSource;
+  ConstantConfig constantConfig;
+  MockDio mockDio;
+  MockDioAdapter mockDioAdapter;
+
+  setUp(() {
+    mockDio = MockDio();
+    constantConfig = ConstantConfig();
+    mockDioAdapter = MockDioAdapter();
+    mockDio.httpClientAdapter = mockDioAdapter;
+    mockDio.options = BaseOptions(
+      baseUrl: BaseUrlConfig().baseUrlDevelopment,
+    );
+    newsRemoteDataSource = NewsRemoteDataSourceImpl(
+      dio: mockDio,
+      constantConfig: constantConfig,
+    );
+  });
+
+  group('getTopHeadlinesNews', () {
+    final tTopHeadlinesNewsResponseModel = TopHeadlinesNewsResponseModel.fromJson(
+      json.decode(
+        fixture('top_headlines_news_response_model.json'),
+      ),
+    );
+
+    void setUpMockDioSuccess() {
+      final responsePayload = json.decode(fixture('top_headlines_news_response_model.json'));
+      final response = Response(
+        data: responsePayload,
+        statusCode: 200,
+        headers: Headers.fromMap({
+          Headers.contentTypeHeader: [Headers.jsonContentType],
+        }),
+      );
+      when(
+        mockDio.get(
+          any,
+          queryParameters: anyNamed('queryParameters'),
+        ),
+      ).thenAnswer((_) async => response);
+    }
+
+    test(
+      'make sure there is a GET request to endpoint /v2/top-headlines?country=:country&apiKey=:apiKey',
+      () async {
+        // arrange
+        setUpMockDioSuccess();
+
+        // act
+        await newsRemoteDataSource.getTopHeadlinesNews();
+
+        // assert
+        verify(
+          mockDio.get(
+            '/v2/top-headlines',
+            queryParameters: {
+              'country': 'id',
+              'apiKey': constantConfig.apiKeyNewsApi,
+            },
+          ),
+        );
+      },
+    );
+
+    test(
+      'make sure to return the TopHeadlinesNewsResponseModel object when the '
+      'response code is successful from the endpoint',
+      () async {
+        // arrange
+        setUpMockDioSuccess();
+
+        // act
+        final result = await newsRemoteDataSource.getTopHeadlinesNews();
+
+        // assert
+        expect(result, tTopHeadlinesNewsResponseModel);
+      },
+    );
+
+    test(
+      'make sure to receive DioError when the response code fails from the endpoint',
+      () async {
+        // arrange
+        final response = Response(
+          data: 'Bad Request',
+          statusCode: 400,
+        );
+        when(mockDio.get(any, queryParameters: anyNamed('queryParameters'))).thenAnswer((_) async => response);
+
+        // act
+        final call = newsRemoteDataSource.getTopHeadlinesNews();
+
+        // assert
+        expect(() => call, throwsA(TypeMatcher<DioError>()));
+      },
+    );
+  });
+}

test/fixture/fixture_reader.dart

@@ -1,7 +1,5 @@
 import 'dart:io';
 
-final baseUrlTest = 'https://bengkelrobot.net:8003/v2';
-
 String fixture(String name) {
   var currentDirectory = Directory.current.toString().replaceAll('\'', '');
   var lastDirectory = currentDirectory.split('/')[currentDirectory.split('/').length - 1];