/** Test if the Alien creates a new Bullet which goes downwards. */
@Test
public final void shootBulletTest() {
float x = 1;
float y = 1;
Alien alien = new NormalAlien(x, y);
ArrayList<Bullet> list = alien.shootBullet(1);
Bullet bullet = list.get(0);
assertEquals(alien.getXCoor(), bullet.getXCoor(), 0.05);
assertEquals(alien.getYCoor(), bullet.getYCoor(), 0.05);
bullet.move(1.0);
assertEquals(alien.getXCoor(), bullet.getXCoor(), 0.05);
assertEquals(alien.getYCoor() + 1, bullet.getYCoor(), 0.05);
}