public void Allow_ReadAndWriteProperty_ValueMatchesPriorSetValue()
{
Assert.Equal(0, _headers.Allow.Count);
_headers.Allow.Add("custom1");
_headers.Allow.Add("custom2");
Assert.Equal(2, _headers.Allow.Count);
Assert.Equal(2, _headers.GetValues("Allow").Count());
Assert.Equal("custom1", _headers.Allow.ElementAt(0));
Assert.Equal("custom2", _headers.Allow.ElementAt(1));
_headers.Allow.Clear();
Assert.Equal(0, _headers.Allow.Count);
Assert.False(_headers.Contains("Allow"));
}