chore: write tests for survey detail screen

# Conflicts:
#	lib/modules/survey_detail/components/content.dart

lib/modules/survey_detail/components/content.dart

@@ -21,6 +21,7 @@ class Content extends StatelessWidget {
             StreamsSelector0<SurveyInfo>.value(
               stream: state._survey,
               builder: (_, survey, __) => Image(
+                key: SurveyDetailView.backgroundImageKey,
                 image: NetworkImage(survey.coverImageUrl!),
                 fit: BoxFit.fill,
               ),
@@ -74,6 +75,7 @@ class Content extends StatelessWidget {
                     minWidth: 140,
                   ),
                   child: Button(
+                    key: SurveyDetailView.startSurveyButtonKey,
                     onPressed: () =>
                         state.delegate?.startSurveyButtonDidTap.add(null),
                     title: AppLocalizations.of(context)!

lib/modules/survey_detail/survey_detail_view.dart

@@ -8,6 +8,9 @@ abstract class SurveyDetailViewDelegate implements AlertViewMixinDelegate {
 
 abstract class SurveyDetailView extends View<SurveyDetailViewDelegate>
     with ProgressHUDViewMixin, AlertViewMixin {
+  static const backgroundImageKey = Key("background_image_");
+  static const startSurveyButtonKey = Key("start_survey_button");
+
   void setSurvey(SurveyInfo survey);
 }
 

test/modules/survey_detail/survey_detail_interactor_test.dart

@@ -0,0 +1,77 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:quick_test/quick_test.dart';
+import 'package:survey/models/detailed_survey_info.dart';
+import 'package:survey/models/survey_info.dart';
+import 'package:survey/modules/survey_detail/survey_detail_module.dart';
+import 'package:survey/repositories/survey_repository.dart';
+import 'package:survey/services/locator/locator_service.dart';
+import '../../helpers/behavior_subject_generator.dart';
+import 'survey_detail_interactor_test.mocks.dart';
+
+@GenerateMocks([SurveyDetailInteractorDelegate, SurveyRepository])
+void main() {
+  describe("a SurveyDetail interactor", () {
+    late SurveyDetailInteractor interactor;
+    late MockSurveyDetailInteractorDelegate delegate;
+    late BehaviorSubjectGenerator generator;
+    late MockSurveyRepository surveyRepository;
+
+    final survey = SurveyInfo();
+    survey.id = "id";
+
+    beforeEach(() {
+      generator = BehaviorSubjectGenerator();
+
+      surveyRepository = MockSurveyRepository();
+      locator.registerSingleton<SurveyRepository>(surveyRepository);
+
+      delegate = MockSurveyDetailInteractorDelegate();
+      when(delegate.detailedSurveyDidFetch)
+          .thenAnswer((realInvocation) => generator.make(0));
+      when(delegate.detailedSurveyDidFailToFetch)
+          .thenAnswer((realInvocation) => generator.make(1));
+
+      interactor = SurveyDetailInteractorImpl();
+      interactor.delegate = delegate;
+      interactor.arguments = SurveyDetailArguments(survey: survey);
+    });
+
+    describe("its survey is got", () {
+      it("returns correct survey", () {
+        expect(interactor.survey, survey);
+      });
+    });
+
+    describe("its fetchDetailedSurvey() is called", () {
+      context("when survey repository's fetchDetailedSurvey() return success",
+          () {
+        final detailedSurvey = DetailedSurveyInfo();
+        beforeEach(() {
+          when(surveyRepository.fetchDetailedSurvey(any))
+              .thenAnswer((realInvocation) => Future.value(detailedSurvey));
+          interactor.fetchDetailedSurvey();
+        });
+
+        it("triggers delegate's detailedSurveyDidFetch to emit", () {
+          expect(delegate.detailedSurveyDidFetch, emits(detailedSurvey));
+        });
+      });
+
+      context("when survey repository's fetchDetailedSurvey() return failure",
+          () {
+        final exception = Exception();
+        beforeEach(() {
+          when(surveyRepository.fetchDetailedSurvey(any))
+              .thenAnswer((realInvocation) => Future.error(exception));
+          interactor.fetchDetailedSurvey();
+        });
+
+        it("triggers delegate's detailedSurveyDidFailToFetch to emit", () {
+          expect(delegate.detailedSurveyDidFailToFetch, emits(exception));
+        });
+      });
+    });
+  });
+}

test/modules/survey_detail/survey_detail_interactor_test.mocks.dart

@@ -0,0 +1,72 @@
+// Mocks generated by Mockito 5.0.7 from annotations
+// in survey/test/modules/survey_detail/survey_detail_interactor_test.dart.
+// Do not manually edit this file.
+
+import 'dart:async' as _i6;
+
+import 'package:mockito/mockito.dart' as _i1;
+import 'package:rxdart/src/subjects/behavior_subject.dart' as _i2;
+import 'package:survey/models/detailed_survey_info.dart' as _i3;
+import 'package:survey/models/survey_info.dart' as _i7;
+import 'package:survey/modules/survey_detail/survey_detail_module.dart' as _i4;
+import 'package:survey/repositories/survey_repository.dart' as _i5;
+
+// ignore_for_file: comment_references
+// ignore_for_file: unnecessary_parenthesis
+
+// ignore_for_file: prefer_const_constructors
+
+// ignore_for_file: avoid_redundant_argument_values
+
+class _FakeBehaviorSubject<T> extends _i1.Fake
+    implements _i2.BehaviorSubject<T> {}
+
+class _FakeDetailedSurveyInfo extends _i1.Fake
+    implements _i3.DetailedSurveyInfo {}
+
+/// A class which mocks [SurveyDetailInteractorDelegate].
+///
+/// See the documentation for Mockito's code generation for more information.
+class MockSurveyDetailInteractorDelegate extends _i1.Mock
+    implements _i4.SurveyDetailInteractorDelegate {
+  MockSurveyDetailInteractorDelegate() {
+    _i1.throwOnMissingStub(this);
+  }
+
+  @override
+  _i2.BehaviorSubject<_i3.DetailedSurveyInfo> get detailedSurveyDidFetch =>
+      (super.noSuchMethod(Invocation.getter(#detailedSurveyDidFetch),
+              returnValue: _FakeBehaviorSubject<_i3.DetailedSurveyInfo>())
+          as _i2.BehaviorSubject<_i3.DetailedSurveyInfo>);
+  @override
+  _i2.BehaviorSubject<Exception> get detailedSurveyDidFailToFetch =>
+      (super.noSuchMethod(Invocation.getter(#detailedSurveyDidFailToFetch),
+              returnValue: _FakeBehaviorSubject<Exception>())
+          as _i2.BehaviorSubject<Exception>);
+}
+
+/// A class which mocks [SurveyRepository].
+///
+/// See the documentation for Mockito's code generation for more information.
+class MockSurveyRepository extends _i1.Mock implements _i5.SurveyRepository {
+  MockSurveyRepository() {
+    _i1.throwOnMissingStub(this);
+  }
+
+  @override
+  _i6.Future<bool> get isSurveysCached =>
+      (super.noSuchMethod(Invocation.getter(#isSurveysCached),
+          returnValue: Future<bool>.value(false)) as _i6.Future<bool>);
+  @override
+  _i6.Future<List<_i7.SurveyInfo>> fetchSurveys({bool? force}) =>
+      (super.noSuchMethod(Invocation.method(#fetchSurveys, [], {#force: force}),
+              returnValue:
+                  Future<List<_i7.SurveyInfo>>.value(<_i7.SurveyInfo>[]))
+          as _i6.Future<List<_i7.SurveyInfo>>);
+  @override
+  _i6.Future<_i3.DetailedSurveyInfo> fetchDetailedSurvey(String? id) =>
+      (super.noSuchMethod(Invocation.method(#fetchDetailedSurvey, [id]),
+              returnValue: Future<_i3.DetailedSurveyInfo>.value(
+                  _FakeDetailedSurveyInfo()))
+          as _i6.Future<_i3.DetailedSurveyInfo>);
+}

test/modules/survey_detail/survey_detail_module_test.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:quick_test/quick_test.dart';
+import 'package:survey/modules/survey_detail/survey_detail_module.dart';
+
+import '../../mocks/build_context.dart';
+
+void main() {
+  describe("a SurveyDetail module", () {
+    late SurveyDetailModule module;
+    beforeEach(() {
+      module = SurveyDetailModule();
+    });
+
+    describe("its build is called", () {
+      late Widget widget;
+
+      beforeEach(() {
+        widget = module.build(MockBuildContext());
+      });
+
+      it("returns SurveyDetailViewImpl", () {
+        expect(widget, isA<SurveyDetailViewImpl>());
+      });
+    });
+  });
+}

test/modules/survey_detail/survey_detail_presenter_test.dart

@@ -0,0 +1,88 @@
+import 'package:mockito/annotations.dart';
+import 'package:mockito/mockito.dart';
+import 'package:quick_test/quick_test.dart';
+import 'package:survey/models/detailed_survey_info.dart';
+import 'package:survey/models/survey_info.dart';
+import 'package:survey/modules/survey_detail/survey_detail_module.dart';
+
+import '../../mocks/build_context.dart';
+import 'survey_detail_presenter_test.mocks.dart';
+
+@GenerateMocks([SurveyDetailView, SurveyDetailRouter, SurveyDetailInteractor])
+void main() {
+  describe("a SurveyDetail presenter", () {
+    late SurveyDetailPresenterImpl presenter;
+    late MockSurveyDetailView view;
+    late MockSurveyDetailRouter router;
+    late MockSurveyDetailInteractor interactor;
+    late MockBuildContext buildContext;
+    final survey = SurveyInfo();
+
+    beforeEach(() {
+      buildContext = MockBuildContext();
+
+      view = MockSurveyDetailView();
+      when(view.context).thenReturn(buildContext);
+
+      router = MockSurveyDetailRouter();
+
+      interactor = MockSurveyDetailInteractor();
+      when(interactor.survey).thenReturn(survey);
+
+      presenter = SurveyDetailPresenterImpl();
+      presenter.configure(view: view, interactor: interactor, router: router);
+    });
+
+    describe("its detailedSurveyDidFailToFetch to emit", () {
+      final exception = Exception();
+      beforeEach(() {
+        presenter.detailedSurveyDidFailToFetch.add(exception);
+      });
+
+      it("triggers view to dismiss progress hud and alert error", () {
+        verify(view.dismissProgressHUD()).called(1);
+        verify(view.alert(exception)).called(1);
+      });
+    });
+
+    describe("its detailedSurveyDidFetch emits", () {
+      final survey = DetailedSurveyInfo();
+      beforeEach(() {
+        presenter.detailedSurveyDidFetch.add(survey);
+      });
+
+      it("triggers view to dismiss progress hud", () {
+        verify(view.dismissProgressHUD()).called(1);
+      });
+
+      it("triggers router to push to Survey Questions screen", () {
+        verify(
+            router.pushToSurveyQuestionsScreen(buildContext, survey: survey));
+      });
+    });
+
+    describe("its stateDidInit emits", () {
+      beforeEach(() {
+        presenter.stateDidInit.add(null);
+      });
+
+      it("triggers view to set survey", () {
+        verify(view.setSurvey(survey)).called(1);
+      });
+    });
+
+    describe("its startSurveyButtonDidTap emits", () {
+      beforeEach(() {
+        presenter.startSurveyButtonDidTap.add(null);
+      });
+
+      it("triggers view to dismiss progress hud", () {
+        verify(view.showProgressHUD()).called(1);
+      });
+
+      it("triggers interactor to fetch detailed survey", () {
+        verify(interactor.fetchDetailedSurvey()).called(1);
+      });
+    });
+  });
+}