fix: 🐛 unit test for Forge2dGame

  - Working on unit test

packages/flame_forge2d/test/body_component_test.dart

@@ -1,11 +1,12 @@
-import 'dart:ui';
-
+import 'package:flame/extensions.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flame_test/flame_test.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mocktail/mocktail.dart';
 
+import 'helpers/mocks.dart';
+
 class _TestBodyComponent extends BodyComponent {
  @override
  Body createBody() => body;
@@ -52,6 +53,9 @@ void main() {
  await game.add(component);
 
  game.camera.followVector2(Vector2.zero());
+
+ // a CircleShape contains point
+ expect(component.containsPoint(Vector2.all(1.5)), isTrue);
  },
  verify: (game, tester) async {
  await expectLater(
@@ -107,6 +111,9 @@ void main() {
  await game.add(component);
 
  game.camera.followVector2(Vector2.zero());
+
+ // a PolygonShape contains point
+ expect(component.containsPoint(Vector2.all(10)), isTrue);
  },
  verify: (game, tester) async {
  await expectLater(
@@ -258,5 +265,63 @@ void main() {
  });
  });
  });
+
+ group('Add component to parent', () {
+ final flameTester = FlameTester(Forge2DGame.new);
+ final testPaint = Paint()..color = const Color(0xffff0000);
+
+ flameTester.testGameWidget(
+ 'add and remove child to BodyComponent',
+ setUp: (game, tester) async {
+ final worldCenter =
+ game.screenToWorld(game.size * game.camera.zoom / 2);
+
+ final bodyDef = BodyDef(position: worldCenter.clone());
+ final body = game.world.createBody(bodyDef);
+ final shape = PolygonShape()
+ ..set(
+ [
+ Vector2.zero(),
+ Vector2.all(10),
+ Vector2(0, 10),
+ ],
+ );
+ body.createFixture(FixtureDef(shape));
+
+ final component = _TestBodyComponent()
+ ..body = body
+ ..paint = testPaint;
+
+ component.addToParent(game);
+ await game.ready();
+
+ expect(game.contains(component), true);
+ expect(component.isMounted, true);
+ expect(game.children.length, 1);
+ component.removeFromParent();
+ await game.ready();
+
+ expect(component.isMounted, false);
+ expect(component.isLoaded, true);
+ expect(game.children.length, 0);
+ },
+ );
+ });
+
+ group('BodyComponent contact events', () {
+ test('beginContact called', () {
+ final contactCallback = MockContactCallback();
+ final contact = MockContact();
+ final bodyA = MockBody()..angularDamping = 1.0;
+ final fixtureA = MockFixture();
+ when(() => bodyA.userData).thenReturn(contactCallback);
+ when(() => fixtureA.userData).thenReturn(Object());
+ contactCallback.beginContact(fixtureA.userData!, contact);
+
+ verify(
+ () => contactCallback.beginContact(fixtureA.userData!, contact),
+ ).called(1);
+ });
+ });
  });
 }

packages/flame_forge2d/test/forge2d_game_test.dart

@@ -0,0 +1,38 @@
+import 'package:flame_forge2d/flame_forge2d.dart';
+import 'package:test/test.dart';
+
+class _TestForge2dGame extends Forge2DGame {
+ _TestForge2dGame() : super(zoom: 4.0, gravity: Vector2(0, -10.0));
+}
+
+void main() {
+ group(
+ 'Test corresponding position on screen and in the Forge2D world',
+ () {
+ test('Zero positioned camera should be zero in world', () {
+ expect(
+ _TestForge2dGame().screenToWorld(Vector2.zero()),
+ Vector2.zero(),
+ );
+ });
+
+ test('Zero positioned camera should be zero in FlameWorld', () {
+ expect(
+ _TestForge2dGame().screenToFlameWorld(Vector2.zero()),
+ Vector2.zero(),
+ );
+ });
+ },
+ );
+
+ group(
+ 'Test input vector does not get modified while function call',
+ () {
+ test('Camera should not modify the input vector while projecting it', () {
+ final vec = Vector2(5, 6);
+ _TestForge2dGame().camera.projectVector(vec);
+ expect(vec, Vector2(5, 6));
+ });
+ },
+ );
+}

packages/flame_forge2d/test/helpers/mocks.dart

@@ -1,3 +1,5 @@
+import 'dart:ui';
+
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:mocktail/mocktail.dart';
 
@@ -12,3 +14,5 @@ class MockFixture extends Mock implements Fixture {}
 class MockManifold extends Mock implements Manifold {}
 
 class MockContactImpulse extends Mock implements ContactImpulse {}
+
+class MockCanvas extends Mock implements Canvas {}