public void RuleTable_Extend()
{
var tbl = new RuleTable <int, string, object>(d => Expression.Constant(1), (d, s) => d);
tbl.Add <int>("foo", x => x);
var ext = tbl.Extend();
ext.Add <int>("bar", x => x);
var e1 = ext.GetEnumerator();
var e2 = ((IEnumerable)ext).GetEnumerator();
Assert.IsTrue(e1.MoveNext());
Assert.IsTrue(e2.MoveNext());
var c1 = e1.Current;
var c2 = (Rule <int, string, object>)e2.Current;
Assert.AreEqual("foo", c1.Name);
Assert.AreEqual("foo", c2.Name);
Assert.IsTrue(e1.MoveNext());
Assert.IsTrue(e2.MoveNext());
var c3 = e1.Current;
var c4 = (Rule <int, string, object>)e2.Current;
Assert.AreEqual("bar", c3.Name);
Assert.AreEqual("bar", c4.Name);
Assert.IsFalse(e1.MoveNext());
Assert.IsFalse(e2.MoveNext());
}
