public void RemovingAllElementsOfKeyWillAlsoRemoveKey()
{
Fixture.Add(0, "hello");
Fixture.Add(0, "cat");
Fixture.Add(0, "dog");
Fixture.Remove(0, "dog");
Fixture.Remove(0, "cat");
Fixture.Remove(0, "hello");
Fixture.Contains(0).Should().Be(false);
}