test(CustomRatingField): Initial commit

test/CustomRatingField_test.dart

@@ -0,0 +1,90 @@
+import 'package:biersommelier/components/CustomRatingField.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('Custom Rating tests', () {
+      testWidgets('Test Default Values', (WidgetTester tester) async{
+        await tester.pumpWidget(
+          MaterialApp(
+            home: CustomRatingField(
+              onRatingSelected: (rating) {},
+            ),
+          ),
+        );
+
+        expect(find.byType(CustomRatingField), findsOneWidget);
+        expect(find.byWidgetPredicate(
+            (widget) => 
+              widget is Image &&
+              (widget.image as AssetImage).assetName == 'assets/icons/review_empty.png',
+          ),
+          findsNWidgets(5),
+        );
+      });
+
+      testWidgets('Test with initial Rating of 3', (WidgetTester tester) async{
+        await tester.pumpWidget(
+          MaterialApp(
+            home: CustomRatingField(
+              initialRating: 3,
+              onRatingSelected: (rating) {},
+            ),
+          ),
+        );
+
+        expect(find.byType(CustomRatingField), findsOneWidget);
+        expect(find.byWidgetPredicate(
+          (widget) => 
+            widget is Image &&
+            (widget.image as AssetImage).assetName == 'assets/icons/review_empty.png',
+        ),
+        findsNWidgets(2),
+        );
+        expect(find.byWidgetPredicate(
+          (widget) => 
+            widget is Image &&
+            (widget.image as AssetImage).assetName == 'assets/icons/review_full.png',
+        ),
+        findsNWidgets(3),
+        );
+      });
+
+      testWidgets('Test if the User makes an input', (WidgetTester tester) async{
+        int selectedRating = 0;
+
+        await tester.pumpWidget(
+          MaterialApp(
+            home: CustomRatingField(
+              onRatingSelected: (rating) {
+                selectedRating = rating;
+              },
+            ),
+          ),
+        );
+
+        expect(selectedRating, 0);
+
+        await tester.tap(find.byType(GestureDetector).at(1));
+
+        await tester.pumpAndSettle();
+
+        expect(selectedRating, 2);
+
+        expect(find.byWidgetPredicate(
+          (widget) => 
+            widget is Image &&
+            (widget.image as AssetImage).assetName == 'assets/icons/review_empty.png',
+        ),
+        findsNWidgets(3),
+        );
+        expect(find.byWidgetPredicate(
+          (widget) => 
+            widget is Image &&
+            (widget.image as AssetImage).assetName == 'assets/icons/review_full.png',
+        ),
+        findsNWidgets(2),
+        );
+      });
+  });
+}