@Test
public void removesAnElementFromTheMiddle() {
fillVector();
Circle s = new Circle(2.0);
vector.remove(s);
assertFalse(vector.contains(s));
}
@Test
public void removesAnElementFromTheFront() {
Circle s = new Circle(2.0);
vector.add(s);
assertTrue(vector.contains(s));
vector.remove(s);
assertFalse(vector.contains(s));
}