Add tests

test/cart_increment_test.dart

@@ -0,0 +1,13 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:thesis_shop/redux/actions/actions.dart';
+import 'package:thesis_shop/redux/store.dart';
+
+import 'product_service_mock.dart';
+
+void main() {
+  test('cart increment test', () {
+    final store = createStore(productService: MockedProductService());
+    store.dispatch(IncrementProductAction(product: demoProducts.first));
+    expect(store.state.productQuantities[demoProducts.first.title], 1);
+  });
+}

test/product_service_mock.dart

@@ -1,15 +1,17 @@
 import 'package:thesis_shop/models/product.dart';
 import 'package:thesis_shop/service/product_service.dart';
 
+const demoProducts = [
+  Product(title: 'Bananen', price: 3),
+  Product(title: 'Äpfel', price: 2),
+  Product(title: 'Birnen', price: 2.5),
+  Product(title: 'Kirschen', price: 1.2),
+];
+
 class MockedProductService implements ProductService {
   @override
   Future<List<Product>> fetchProducts() async {
-    return const [
-      Product(title: 'Bananen', price: 3),
-      Product(title: 'Äpfel', price: 2),
-      Product(title: 'Birnen', price: 2.5),
-      Product(title: 'Kirschen', price: 1.2),
-    ];
+    return demoProducts;
   }
 
   @override

test/total_price_text_test.dart

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_redux/flutter_redux.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:redux/redux.dart';
+import 'package:thesis_shop/models/remote_resource.dart';
+import 'package:thesis_shop/redux/state.dart';
+import 'package:thesis_shop/screens/cart/total_price_text.dart';
+
+class AppStateMock extends AppState {
+  AppStateMock()
+      : super(
+            isSignedIn: false,
+            remoteProducts: const RemoteResource.loading(),
+            productQuantities: {});
+  @override
+  double get totalPrice => 10.0;
+}
+
+void main() {
+  testWidgets('test total price text', (tester) async {
+    final store = Store<AppState>((s, _) => s, initialState: AppStateMock());
+    await tester.pumpWidget(
+      MaterialApp(
+        home: StoreProvider<AppState>(
+          store: store,
+          child: const TotalPriceText(),
+        ),
+      ),
+    );
+    expect(find.text('Gesamtpreis: 10.00€'), findsOneWidget);
+  });
+}