public void RuleTable_AsReadOnly()
{
var tbl = new RuleTable <int, string, object>(d => Expression.Constant(1), (d, s) => d);
tbl.Add <int>("foo", x => x);
var rdo = tbl.AsReadOnly();
Assert.ThrowsException <NotSupportedException>(() => rdo.Add <int>("qux", x => x));
var e1 = rdo.GetEnumerator();
var e2 = ((IEnumerable)rdo).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.IsFalse(e1.MoveNext());
Assert.IsFalse(e2.MoveNext());
}
