public void LastModified_ReadAndWriteProperty_ValueMatchesPriorSetValue()
{
Assert.Null(_headers.LastModified);
DateTimeOffset expected = DateTimeOffset.Now;
_headers.LastModified = expected;
Assert.Equal(expected, _headers.LastModified);
_headers.LastModified = null;
Assert.Null(_headers.LastModified);
Assert.False(_headers.Contains("Last-Modified"));
}