public void AddRemoveWorks()
{
var c = new FastCollection<int> { 1, 2, 3, 4, 5 };
Assert.True(c.SequenceEqual(new[] { 1, 2, 3, 4, 5 }));
Assert.Equal(5, c.Count);
var originalCapacity = c.Capacity;
Assert.InRange(originalCapacity, 5, int.MaxValue);
Assert.True(c.Remove(5));
AssertEquals(c, new[] { 1, 2, 3, 4 });
Assert.InRange(c.Capacity, 4, originalCapacity);
c.RemoveAt(3);
AssertEquals(c, new[] { 1, 2, 3 });
Assert.InRange(c.Capacity, 3, originalCapacity);
Assert.True(c.Remove(1));
AssertEquals(c, new[] { 2, 3 });
Assert.InRange(c.Capacity, 2, originalCapacity);
Assert.False(c.Remove(1));
var oneEl = c[1];
c.RemoveAt(0);
Assert.Equal(oneEl, c[0]);
Assert.Equal(1, c.Count);
c.Add(4);
AssertEquals(c, new[] { oneEl, 4 });
c.Clear();
Assert.True(c.SequenceEqual(new int[0]));
Assert.Equal(0, c.Count);
}