//JAVA TO C# CONVERTER TODO TASK: Most Java annotations will not have direct .NET equivalent attributes:
//ORIGINAL LINE: @Test void clear()
internal virtual void Clear()
{
_set.addAll(1, 2, 3);
assertEquals(3, _set.size());
_set.clear();
assertEquals(0, _set.size());
_set.clear();
assertEquals(0, _set.size());
_set.addAll(4, 5, 6);
assertEquals(3, _set.size());
_set.clear();
assertEquals(0, _set.size());
}