public void RemoveWorldObjectTest()
{
Projectile projectile1 = new Projectile();
Projectile projectile2 = new Projectile();
Spaceship spaceship = new Spaceship();
Planet planet = new Planet();
Explosion explosion = new Explosion();
WorldObject[] worldObjects = { projectile1, projectile2, spaceship, planet, explosion };
World target = new World(worldObjects);
target.RemoveWorldObject(projectile1);
target.RemoveWorldObject(projectile2);
target.RemoveWorldObject(spaceship);
target.RemoveWorldObject(explosion);
Assert.IsFalse((new List<WorldObject>(target.WorldObjects)).Contains(projectile1));
Assert.IsFalse((new List<WorldObject>(target.WorldObjects)).Contains(projectile2));
Assert.IsFalse((new List<WorldObject>(target.WorldObjects)).Contains(spaceship));
Assert.IsFalse((new List<WorldObject>(target.WorldObjects)).Contains(explosion));
Assert.IsTrue((new List<WorldObject>(target.WorldObjects)).Contains(planet));
}