public void RemoveAllWorks()
{
var c = new FastCollection<int> { 1, 2, 3, 4, 5 };
c.RemoveAll(x => x % 2 == 0);
AssertEquals(c, new[] { 1, 3, 5 });
c.RemoveAll(x => false);
AssertEquals(c, new[] { 1, 3, 5 });
c.RemoveAll(x => true);
Assert.Equal(0, c.Count);
Assert.False(c.Any());
c.RemoveAll(x => true);
Assert.Equal(0, c.Count);
Assert.False(c.Any());
}