public void can_enumerate_multiple_pairs()
{
var rvm = new Rv.Message();
rvm.AddField("custom1", "value1");
rvm.AddField("custom2", "value2");
var headers = new ReadOnlyRvMessageHeaders(rvm);
Assert.AreEqual(new KeyValuePair <string, string>("custom1", "value1"), headers.First());
Assert.AreEqual(new KeyValuePair <string, string>("custom2", "value2"), headers.ElementAt(1));
Assert.AreEqual(2, headers.Count());
}