public void AddHeader_AddValidHeaderEntry_HeaderContainsHeaderEntry()
{
GeckoMIMEInputStream stream = new GeckoMIMEInputStream();
stream.AddHeader("Content-Type", "application/x-www-form-urlencoded");
string header = ReadGeckoMIMEInputStreamAsUTF8(stream);
Assert.IsTrue(header.Contains("Content-Type"));
Assert.IsTrue(header.Contains("application/x-www-form-urlencoded"));
}