public void HasCount_WithEmptyEnumerableAndEmptyCount_ExpectsTrue() => True(ENMRBL_EMPTY.HasCount(0));
public void HasCount_WithEmptyEnumerableAndPositiveCount_ExpectsFalse() => False(ENMRBL_EMPTY.HasCount(COUNT_ANY));
public void HasCount_WithEmptyEnumerableAndNegativeCount_Throws() => Throws <ArgumentOutOfRangeException>( () => ENMRBL_EMPTY.HasCount(-COUNT_ANY));