public void TryParseAdd_UseSpecialValue_Added()
{
MockHeaders headers = new MockHeaders(knownHeader, new MockHeaderParser(typeof(Uri)));
HttpHeaderValueCollection<Uri> collection = new HttpHeaderValueCollection<Uri>(knownHeader, headers,
specialValue);
Assert.True(collection.TryParseAdd(specialValue.AbsoluteUri));
Assert.True(collection.IsSpecialValueSet);
Assert.Equal(specialValue.ToString(), collection.ToString());
}