mirror of https://github.com/flutter/pinball.git
feat: defined InitialPosition mixin (#37)
* feat: defined InitialPosition mixin * docs: included doc comments * refactor: cleaned test file * fix: solved ball_test loading * feat: included genericspull/53/head
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import 'package:flame_forge2d/flame_forge2d.dart';
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/// Forces a given [BodyComponent] to position their [body] to an
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/// [initialPosition].
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mixin InitialPosition<T extends Forge2DGame> on BodyComponent<T> {
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/// The initial position of the [body].
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late final Vector2 initialPosition;
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@override
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void onMount() {
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super.onMount();
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assert(
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body.position == initialPosition,
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'Body position is not equal to initial position.',
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);
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}
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}
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// ignore_for_file: cascade_invocations
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import 'package:flame_forge2d/flame_forge2d.dart';
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import 'package:flame_test/flame_test.dart';
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import 'package:flutter_test/flutter_test.dart';
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import 'package:pinball/game/game.dart';
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class TestBodyComponent extends BodyComponent with InitialPosition {
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@override
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Body createBody() {
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return world.createBody(BodyDef());
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}
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}
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class TestPositionedBodyComponent extends BodyComponent with InitialPosition {
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@override
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Body createBody() {
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return world.createBody(BodyDef()..position = initialPosition);
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}
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}
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void main() {
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final flameTester = FlameTester(Forge2DGame.new);
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group('InitialPosition', () {
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test('correctly sets and gets', () {
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final component = TestBodyComponent()..initialPosition = Vector2(1, 2);
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expect(component.initialPosition, Vector2(1, 2));
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});
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test('can only be set once', () {
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final component = TestBodyComponent()..initialPosition = Vector2(1, 2);
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expect(
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() => component.initialPosition = Vector2(3, 4),
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throwsA(isA<Error>()),
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);
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});
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flameTester.test(
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'returns normally '
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'when the body sets the position to initial position',
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(game) async {
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final component = TestPositionedBodyComponent()
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..initialPosition = Vector2.zero();
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await expectLater(
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() async => game.ensureAdd(component),
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returnsNormally,
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);
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},
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);
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flameTester.test(
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'throws AssertionError '
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'when not setting initialPosition to body',
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(game) async {
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final component = TestBodyComponent()..initialPosition = Vector2.zero();
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await game.ensureAdd(component);
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await expectLater(
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() async => game.ensureAdd(component),
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throwsAssertionError,
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);
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},
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);
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});
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}
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