fix: increased test coverage

packages/pinball_components/test/src/components/flipper_test.dart

@@ -12,19 +12,15 @@ void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
   final flameTester = FlameTester(TestGame.new);
 
-  group(
+  group('Flipper', () {
-    'Flipper',
-    () {
     // TODO(alestiago): Add golden tests.
+    // TODO(alestiago): Consider testing always both left and right Flipper.
+
     flameTester.test(
       'loads correctly',
       (game) async {
-          final leftFlipper = Flipper(
+        final leftFlipper = Flipper(side: BoardSide.left);
-            side: BoardSide.left,
+        final rightFlipper = Flipper(side: BoardSide.right);
-          );
-          final rightFlipper = Flipper(
-            side: BoardSide.right,
-          );
         await game.ready();
         await game.ensureAddAll([leftFlipper, rightFlipper]);
 
@@ -35,15 +31,10 @@ void main() {
 
     group('constructor', () {
       test('sets BoardSide', () {
-          final leftFlipper = Flipper(
+        final leftFlipper = Flipper(side: BoardSide.left);
-            side: BoardSide.left,
-          );
-
         expect(leftFlipper.side, equals(leftFlipper.side));
 
-          final rightFlipper = Flipper(
+        final rightFlipper = Flipper(side: BoardSide.right);
-            side: BoardSide.right,
-          );
         expect(rightFlipper.side, equals(rightFlipper.side));
       });
     });
@@ -52,11 +43,8 @@ void main() {
       flameTester.test(
         'is dynamic',
         (game) async {
-            final flipper = Flipper(
+          final flipper = Flipper(side: BoardSide.left);
-              side: BoardSide.left,
-            );
           await game.ensureAdd(flipper);
-
           expect(flipper.body.bodyType, equals(BodyType.dynamic));
         },
       );
@@ -64,9 +52,7 @@ void main() {
       flameTester.test(
         'ignores gravity',
         (game) async {
-            final flipper = Flipper(
+          final flipper = Flipper(side: BoardSide.left);
-              side: BoardSide.left,
-            );
           await game.ensureAdd(flipper);
 
           expect(flipper.body.gravityScale, isZero);
@@ -76,9 +62,7 @@ void main() {
       flameTester.test(
         'has greater mass than Ball',
         (game) async {
-            final flipper = Flipper(
+          final flipper = Flipper(side: BoardSide.left);
-              side: BoardSide.left,
-            );
           final ball = Ball(baseColor: Colors.white);
 
           await game.ready();
@@ -96,9 +80,7 @@ void main() {
       flameTester.test(
         'has three',
         (game) async {
-            final flipper = Flipper(
+          final flipper = Flipper(side: BoardSide.left);
-              side: BoardSide.left,
-            );
           await game.ensureAdd(flipper);
 
           expect(flipper.body.fixtures.length, equals(3));
@@ -108,9 +90,7 @@ void main() {
       flameTester.test(
         'has density',
         (game) async {
-            final flipper = Flipper(
+          final flipper = Flipper(side: BoardSide.left);
-              side: BoardSide.left,
-            );
           await game.ensureAdd(flipper);
 
           final fixtures = flipper.body.fixtures;
@@ -123,6 +103,31 @@ void main() {
         },
       );
     });
+
+    flameTester.test(
+      'moveDown applies downward velocity',
+      (game) async {
+        final flipper = Flipper(side: BoardSide.left);
+        await game.ensureAdd(flipper);
+
+        expect(flipper.body.linearVelocity, equals(Vector2.zero()));
+        flipper.moveDown();
+
+        expect(flipper.body.linearVelocity.y, lessThan(0));
       },
     );
+
+    flameTester.test(
+      'moveUp applies upward velocity',
+      (game) async {
+        final flipper = Flipper(side: BoardSide.left);
+        await game.ensureAdd(flipper);
+
+        expect(flipper.body.linearVelocity, equals(Vector2.zero()));
+        flipper.moveUp();
+
+        expect(flipper.body.linearVelocity.y, greaterThan(0));
+      },
+    );
+  });
 }