@Test
  public void projectileCollisionTest() {
    Mob testMob = new Mob(testRound, 300, 300, 5, Assets.badGuyNormal, 100);
    Projectile testProjectile =
        new Projectile(
            testRound,
            testMob.getX() + 100,
            testMob.getY() + 100,
            testMob.getX() + 100,
            testMob.getY() + 100,
            10,
            10,
            testMob);
    testRound.addEntity(testMob);

    // collision detection tests
    // move the mob to some boundary of the map
    testMob.setVelocity(-1, 0);
    for (int i = 0; i < 100; i++) {
      testMob.update((float) 0.1);
    }

    // the mob should be stuck colliding against something
    testProjectile =
        new Projectile(
            testRound,
            testMob.getX(),
            testMob.getY() + 100,
            testMob.getX(),
            testMob.getY(),
            100,
            100,
            null);
    // fire projectile at mob and check it is removed
    testProjectile.update(1);
    assertEquals(true, testProjectile.isRemoved());
  }
  @Test
  public void projectileMovementTest() {

    // simple movement tests
    // x direction test
    Mob testMob = new Mob(testRound, 300, 300, 5, Assets.badGuyNormal, 100);
    Projectile testProjectile =
        new Projectile(
            testRound,
            testMob.getX() + 100,
            testMob.getY() + 100,
            testMob.getX() + 100,
            testMob.getY() + 100,
            10,
            10,
            testMob);
    int[] expectedCoord = new int[] {400, 400};
    int[] actualCoord = new int[] {(int) testProjectile.getX(), (int) testProjectile.getY()};
    assertArrayEquals(expectedCoord, actualCoord);
    testProjectile.update(1);
    expectedCoord = new int[] {410, 400};
    actualCoord = new int[] {(int) testProjectile.getX(), (int) testProjectile.getY()};
    assertArrayEquals(expectedCoord, actualCoord);

    // y direction test
    testProjectile =
        new Projectile(
            testRound,
            testMob.getX(),
            testMob.getY(),
            testMob.getX(),
            testMob.getY() + 100,
            10,
            10,
            testMob);
    testProjectile.update(1);
    expectedCoord = new int[] {300, 310};
    actualCoord = new int[] {(int) testProjectile.getX(), (int) testProjectile.getY()};
    assertArrayEquals(expectedCoord, actualCoord);
  }