public void Getter_NonEmptyCollectionNonExistentHeader_Success()
{
WebHeaderCollection w = new WebHeaderCollection();
w["name"] = "value";
Assert.Null(w["foo"]);
Assert.Equal(1, w.Count);
Assert.NotEmpty(w);
Assert.NotEmpty(w.AllKeys);
Assert.Equal(new[] { "name" }, w.AllKeys);
Assert.Equal("value", w["name"]);
}