Add tests with golden files

Let's see if this doesn't make too much work later on, when changing some detail
in a widget causes the test to fail

test/gym_mode_screen_test.dart

@@ -80,6 +80,8 @@ void main() {
     expect(find.byIcon(Icons.chevron_left), findsNothing);
     expect(find.byIcon(Icons.exit_to_app), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsOneWidget);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_1.png'));
+
     await tester.tap(find.byIcon(Icons.chevron_right));
     await tester.pumpAndSettle();
 
@@ -89,6 +91,7 @@ void main() {
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
     expect(find.byIcon(Icons.exit_to_app), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsOneWidget);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_2.png'));
     await tester.drag(find.byType(ExerciseOverview), Offset(-500.0, 0.0));
     await tester.pumpAndSettle();
 
@@ -102,6 +105,7 @@ void main() {
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
     expect(find.byIcon(Icons.exit_to_app), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsOneWidget);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_3.png'));
     await tester.drag(find.byType(LogPage), Offset(-500.0, 0.0));
     await tester.pumpAndSettle();
 
@@ -111,6 +115,7 @@ void main() {
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
     expect(find.byIcon(Icons.exit_to_app), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsOneWidget);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_4.png'));
     await tester.tap(find.byIcon(Icons.chevron_right));
     await tester.pumpAndSettle();
 
@@ -118,6 +123,7 @@ void main() {
     expect(find.text('test exercise 1'), findsOneWidget);
     expect(find.byType(LogPage), findsOneWidget);
     expect(find.byType(Form), findsOneWidget);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_5.png'));
     await tester.drag(find.byType(LogPage), Offset(-500.0, 0.0));
     await tester.pumpAndSettle();
 
@@ -127,6 +133,7 @@ void main() {
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
     expect(find.byIcon(Icons.exit_to_app), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsOneWidget);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_6.png'));
     await tester.tap(find.byIcon(Icons.chevron_right));
     await tester.pumpAndSettle();
 
@@ -137,6 +144,7 @@ void main() {
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
     expect(find.byIcon(Icons.exit_to_app), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsNothing);
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('gym_mode_7.png'));
 
     //
   });

test/nutritional_meal_form_test.dart

@@ -114,4 +114,9 @@ void main() {
     // Detail page
     // ...
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen(meal1));
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('nutritional_meal_form.png'));
+  });
 }

test/nutritional_plan_form_test.dart

@@ -118,4 +118,9 @@ void main() {
     await tester.pumpAndSettle();
     expect(find.text(('New cool plan')), findsOneWidget, reason: 'Nutritional plan detail page');
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen(plan1));
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('nutritional_plan_form.png'));
+  });
 }

test/nutritional_plan_screen_test.dart

@@ -87,4 +87,9 @@ void main() {
 
     expect(find.text('17:00'), findsOneWidget);
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createNutritionalPlan());
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('nutritional_plan_screen.png'));
+  });
 }

test/nutritional_plans_screen_test.dart

@@ -106,4 +106,9 @@ void main() {
     expect(find.text('1.1.2021'), findsOneWidget);
     expect(find.text('10.1.2021'), findsOneWidget);
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen());
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('nutritional_plans_screen.png'));
+  });
 }

test/weight_screen_test.dart

@@ -107,4 +107,9 @@ void main() {
     expect(find.text('1.1.2021'), findsOneWidget);
     expect(find.text('10.1.2021'), findsOneWidget);
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen());
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('weight_screen.png'));
+  });
 }

test/workout_day_form_test.dart

@@ -98,4 +98,9 @@ void main() {
     expect(find.text('Dienstag'), findsOneWidget);
     expect(find.text('Donnerstag'), findsOneWidget);
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen());
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('workout_day_form.png'));
+  });
 }

test/workout_form_test.dart

@@ -106,4 +106,10 @@ void main() {
     await tester.pumpAndSettle();
     expect(find.text(('New cool workout')), findsOneWidget, reason: 'Workout plan detail page');
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen(plan2));
+    await tester.pumpAndSettle();
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('workout_form.png'));
+  });
 }

test/workout_plan_screen_test.dart

@@ -83,4 +83,12 @@ void main() {
     expect(find.text('Montag, Dienstag'), findsOneWidget);
     expect(find.text('Donnerstag'), findsOneWidget);
   });
+
+  // flutter test --update-goldens
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen());
+    await tester.tap(find.byType(TextButton));
+    await tester.pumpAndSettle();
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('workout_plan_screen.png'));
+  });
 }

test/workout_plans_screen_test.dart

@@ -108,4 +108,9 @@ void main() {
     expect(find.text('1.1.2021'), findsOneWidget);
     expect(find.text('12.2.2021'), findsOneWidget);
   });
+
+  testWidgets('Golden test', (WidgetTester tester) async {
+    await tester.pumpWidget(createHomeScreen());
+    await expectLater(find.byType(MaterialApp), matchesGoldenFile('workout_plan_screens.png'));
+  });
 }