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public class PhysicsEngine {
private Ball ball = new Ball( /* ... initial args ... */ );
private int paddleDirection = 0;
// other fields...

public void setPaddleDirection(int dir) {
this.paddleDirection = dir;
}

public void update() {
// 1) Move paddle, ball, etc.
ball.updatePosition();
checkWallCollision();
// 2) Check other collisions that might happend...
}

private void checkWallCollision() {
double x = ball.getPosition().getX();
// suppose WALL_LEFT and WALL_RIGHT are constants
if (x - BALL_RADIUS = WALL_RIGHT) {
ball.bounceHorizontal();
}
double y = ball.getPosition().getY();
if (y - BALL_RADIUS 
Ich möchte einen Unit-Test für nur die Wandkollisionslogik schreiben, z. B.:
@Test
void testBallBouncesOffRightWall() {
PhysicsEngine engine = new PhysicsEngine();

// somehow position the internal ball so it is just past the right wall
// engine.ball.position = new Point2D(WALL_RIGHT - BALL_RADIUS + 1, 100);

engine.update();

// verify that bounceHorizontal() was called exactly once on the ball
// verify(...);
}
< /code>
Das Problem ist: < /p>

PhysicsEngine