public void TryParseAdd_CallWithNullValue_NothingAdded()
{
HttpResponseHeaders headers = new HttpResponseHeaders();
Assert.True(headers.WwwAuthenticate.TryParseAdd(null));
Assert.False(headers.WwwAuthenticate.IsSpecialValueSet);
Assert.Equal(0, headers.WwwAuthenticate.Count);
Assert.Equal(String.Empty, headers.WwwAuthenticate.ToString());
}