feat: included tests

test/game/components/sling_shot_test.dart

@@ -0,0 +1,105 @@
+// ignore_for_file: cascade_invocations
+
+import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:flame_test/flame_test.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pinball/game/game.dart';
+
+class EmptyGame extends Forge2DGame {}
+
+void main() {
+  group('SlingShot', () {
+    final flameTester = FlameTester(EmptyGame.new);
+
+    flameTester.test(
+      'loads correctly',
+      (game) async {
+        final slingShot = SlingShot(position: Vector2.zero());
+        await game.ensureAdd(slingShot);
+
+        expect(game.contains(slingShot), isTrue);
+      },
+    );
+
+    group('body', () {
+      flameTester.test(
+        'positions correctly',
+        (game) async {
+          final position = Vector2.all(10);
+          final slingShot = SlingShot(position: position);
+          await game.ensureAdd(slingShot);
+
+          expect(slingShot.body.position, equals(position));
+        },
+      );
+
+      flameTester.test(
+        'is static',
+        (game) async {
+          final slingShot = SlingShot(position: Vector2.zero());
+          await game.ensureAdd(slingShot);
+
+          expect(slingShot.body.bodyType, equals(BodyType.static));
+        },
+      );
+    });
+
+    group('first fixture', () {
+      flameTester.test(
+        'exists',
+        (game) async {
+          final slingShot = SlingShot(position: Vector2.zero());
+          await game.ensureAdd(slingShot);
+
+          expect(slingShot.body.fixtures[0], isA<Fixture>());
+        },
+      );
+
+      flameTester.test(
+        'shape is triangular',
+        (game) async {
+          final slingShot = SlingShot(position: Vector2.zero());
+          await game.ensureAdd(slingShot);
+
+          final fixture = slingShot.body.fixtures[0];
+          expect(fixture.shape.shapeType, equals(ShapeType.polygon));
+          expect((fixture.shape as PolygonShape).vertices.length, equals(3));
+        },
+      );
+    });
+
+    group('second fixture', () {
+      flameTester.test(
+        'exists',
+        (game) async {
+          final slingShot = SlingShot(position: Vector2.zero());
+          await game.ensureAdd(slingShot);
+
+          expect(slingShot.body.fixtures[1], isA<Fixture>());
+        },
+      );
+
+      flameTester.test(
+        'shape is edge',
+        (game) async {
+          final slingShot = SlingShot(position: Vector2.zero());
+          await game.ensureAdd(slingShot);
+
+          final fixture = slingShot.body.fixtures[1];
+          expect(fixture.shape.shapeType, equals(ShapeType.edge));
+        },
+      );
+
+      flameTester.test(
+        'has restitution',
+        (game) async {
+          final slingShot = SlingShot(position: Vector2.zero());
+          await game.ensureAdd(slingShot);
+
+          final fixture = slingShot.body.fixtures[1];
+          expect(fixture.restitution, greaterThan(0));
+        },
+      );
+    });
+  });
+}