Add: ListBloc integration tests with ViewStateBuilder.

Author: klisiewicz

test/src/details/details_repository_mock.dart

@@ -1,6 +1,6 @@
 import 'package:flutter_bloc_patterns/src/details/details_repository.dart';
 
-const _delay = Duration(milliseconds: 1);
+const _delay = Duration.zero;
 
 class InMemoryDetailsRepository<T, I> extends DetailsRepository<T, I> {
   final Map<I, T> elements;

test/src/list/base/list_bloc_view_state_test.dart

@@ -0,0 +1,92 @@
+import 'package:flutter_bloc_patterns/base_list.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../../util/widget_tester_ext.dart';
+import '../../view/view_state_builder_util.dart';
+import '../../view/view_state_matchers.dart';
+import '../filter/filter_list_repository_mock.dart';
+
+void main() {
+  ListBloc<int> bloc;
+
+  setUp(() {
+    bloc = ListBloc(InMemoryFilterRepository());
+  });
+
+  Future<void> pumpViewStateBuilder(WidgetTester tester) {
+    return tester.pumpWidget(makeTestableViewStateBuilder(bloc));
+  }
+
+  testWidgets(
+      'should display onReady widget when no action has been performed by the bloc',
+      (WidgetTester tester) async {
+    await pumpViewStateBuilder(tester);
+    expectReadyWidgetIsDisplayed();
+  });
+
+  group(
+    'when loading list succeeds',
+    () {
+      setUp(() {
+        bloc = ListBloc(InMemoryFilterRepository([1, 2, 3]));
+      });
+
+      testWidgets('then should display ready, loading and success widgets',
+          (WidgetTester tester) async {
+        await pumpViewStateBuilder(tester);
+        expectReadyWidgetIsDisplayed();
+        bloc.loadElements();
+        await tester.asyncPump();
+        expectLoadingWidgetIsDisplayed();
+        await tester.asyncPump();
+        expectSuccessWidgetIsDisplayed();
+      });
+    },
+  );
+
+  group(
+    'when list is empty',
+    () {
+      setUp(() {
+        bloc = ListBloc(InMemoryFilterRepository());
+      });
+
+      testWidgets('then should display ready, loading and empty widgets',
+          (WidgetTester tester) async {
+        await pumpViewStateBuilder(tester);
+        expectReadyWidgetIsDisplayed();
+        bloc.loadElements();
+        await tester.asyncPump();
+        expectLoadingWidgetIsDisplayed();
+        await tester.asyncPump();
+        expectEmptyWidgetIsDisplayed();
+      });
+    },
+  );
+
+  group(
+    'when loading list fails',
+    () {
+      final someError = Exception();
+
+      setUp(() {
+        bloc = ListBloc(FailingFilterRepository(someError));
+      });
+
+      testWidgets('then should display ready, loading and error widgets',
+          (WidgetTester tester) async {
+        await pumpViewStateBuilder(tester);
+        expectReadyWidgetIsDisplayed();
+        bloc.loadElements();
+        await tester.asyncPump();
+        expectLoadingWidgetIsDisplayed();
+        await tester.asyncPump();
+        expectErrorWidgetIsDisplayed();
+      });
+    },
+  );
+
+  tearDown(() {
+    bloc.close();
+  });
+}

test/src/list/filter/filter_list_repository_mock.dart

@@ -1,6 +1,6 @@
 import 'package:flutter_bloc_patterns/src/list/filter/filter_list_repository.dart';
 
-const _delay = Duration(milliseconds: 1);
+const _delay = Duration.zero;
 
 class InMemoryFilterRepository<T, F> extends FilterListRepository<T, F> {
   final List<T> elements;