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)); }