Feat/#20 get detail feed detail use case

lib/domain/feed/repository/feed_repository.dart

@@ -1 +1,5 @@
-abstract interface class FeedRepository {}
+import 'package:weaco/domain/feed/model/feed.dart';
+
+abstract interface class FeedRepository {
+  Future<Feed?> getFeed({required String id});
+}

lib/domain/feed/use_case/get_detail_feed_detail_use_case.dart

@@ -0,0 +1,16 @@
+import 'package:weaco/domain/feed/model/feed.dart';
+import 'package:weaco/domain/feed/repository/feed_repository.dart';
+
+class GetDetailFeedDetailUseCase {
+  final FeedRepository _feedRepository;
+
+  GetDetailFeedDetailUseCase({required FeedRepository feedRepository})
+      : _feedRepository = feedRepository;
+
+  /// 레포지토리에 피드 id를 전달하여 해당 피드를 가져온다.
+  /// @param id: 피드 id
+  /// @return Feed: 피드
+  Future<Feed?> execute({required String id}) async {
+    return await _feedRepository.getFeed(id: id);
+  }
+}

test/domain/feed/use_case/get_detail_feed_detail_use_case_test.dart

@@ -0,0 +1,64 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:weaco/domain/feed/model/feed.dart';
+import 'package:weaco/domain/feed/use_case/get_detail_feed_detail_use_case.dart';
+import 'package:weaco/domain/location/model/location.dart';
+import 'package:weaco/domain/weather/model/weather.dart';
+
+import '../../../mock/data/feed/repository/mock_feed_repository_impl.dart';
+
+void main() {
+  group('GetDetailFeedDetailUseCase 클래스', () {
+    final feedRepository = MockFeedRepositoryImpl();
+    final getDetailFeedDetailUseCase =
+        GetDetailFeedDetailUseCase(feedRepository: feedRepository);
+
+    setUp(() => feedRepository.initMockData());
+
+    group('getFeed 메소드는', () {
+      test('파라미터로 받은 id를 FeedRepository.getFeed에 넘긴다.', () async {
+        // Given
+        const String expectedId = 'id';
+
+        // When
+        await getDetailFeedDetailUseCase.execute(id: expectedId);
+
+        // Then
+        expect(feedRepository.getFeedParamId, expectedId);
+      });
+
+      test('FeedRepository.getFeed를 호출하고 반환 받은 값을 그대로 반환한다.', () async {
+        // Given
+        const int expectedCallCount = 1;
+        final expectedFeed = Feed(
+          id: 'id',
+          imagePath: 'imagePath',
+          userEmail: 'userEmail',
+          description: 'description',
+          weather: Weather(
+            temperature: 1,
+            timeTemperature: DateTime.now(),
+            code: 1,
+            createdAt: DateTime.now(),
+          ),
+          seasonCode: 1,
+          location: Location(
+            lat: 1,
+            lng: 1,
+            city: 'city',
+            createdAt: DateTime.now(),
+          ),
+          createdAt: DateTime.now(),
+          deletedAt: null,
+        );
+        feedRepository.getFeedResult = expectedFeed;
+
+        // When
+        final actual = await getDetailFeedDetailUseCase.execute(id: '1');
+
+        // Then
+        expect(actual, expectedFeed);
+        expect(feedRepository.getFeedCallCount, expectedCallCount);
+      });
+    });
+  });
+}

test/mock/data/feed/repository/mock_feed_repository_impl.dart

@@ -0,0 +1,25 @@
+import 'package:weaco/domain/feed/model/feed.dart';
+import 'package:weaco/domain/feed/repository/feed_repository.dart';
+
+class MockFeedRepositoryImpl implements FeedRepository {
+  int getFeedCallCount = 0;
+  String getFeedParamId = '';
+  Feed? getFeedResult;
+
+  void initMockData() {
+    getFeedCallCount = 0;
+    getFeedParamId = '';
+    getFeedResult = null;
+  }
+
+  /// [getFeedCallCount] + 1
+  /// [getFeedParamId]에 [id] 저장
+  /// [getFeedResult] 반환
+  @override
+  Future<Feed?> getFeed({required String id}) async {
+    getFeedCallCount++;
+    getFeedParamId = id;
+
+    return getFeedResult;
+  }
+}