public void AssertThat_ExceptWith_RemovesSpecifiedItems()
{
for (var i = 0; i < 10; i++)
{
_set.Add(i);
}
_set.ExceptWith(new int[] { 1, 2, 3 });
Assert.IsFalse(_set.Contains(1));
Assert.IsFalse(_set.Contains(2));
Assert.IsFalse(_set.Contains(3));
Assert.IsTrue(_set.Contains(4));
Assert.IsTrue(_set.Contains(5));
Assert.IsTrue(_set.Contains(6));
Assert.IsTrue(_set.Contains(7));
Assert.IsTrue(_set.Contains(8));
Assert.IsTrue(_set.Contains(9));
}