fix #603, support mock objects

test/codegen/language/no_such_method_mock_test.dart

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// Dart test program testing that NoSuchMethod is properly called.
+
+import "package:expect/expect.dart";
+
+class Cat {
+  bool eatFood(String food) => true;
+  int scratch(String furniture) => 100;
+}
+
+class MockCat implements Cat {
+  dynamic noSuchMethod(Invocation invocation) {
+    return (invocation.positionalArguments[0] as String).isNotEmpty;
+  }
+}
+
+
+class MockCat2 extends MockCat {
+  // this apparently works.
+  noSuchMethod(_);
+}
+
+class MockCat3 extends MockCat2 implements Cat {
+  bool eatFood(String food, {double amount});
+  int scratch(String furniture, [String furniture2]);
+
+  dynamic noSuchMethod(Invocation invocation) {
+    return (invocation.positionalArguments[0] as String).isNotEmpty &&
+        invocation.namedArguments[#amount] > 0.5;
+  }
+}
+
+
+class MockWithGenerics {
+  /*=T*/ doStuff/*<T>*/(/*=T*/ t);
+
+  noSuchMethod(i) => i.positionalArguments[0] + 100;
+}
+
+
+void main() {
+  MockCat mock = new MockCat();
+  Expect.isTrue((mock as dynamic).eatFood("cat food"));
+  Expect.isFalse(mock.eatFood(""));
+
+  // In strong mode this will be a runtime type error:
+  // bool is not an int. VM will fail with noSuchMethod +.
+  Expect.throws(() => mock.scratch("couch") + 0);
+
+  var mock2 = new MockCat2();
+  Expect.isTrue(mock2.eatFood("cat food"));
+
+  var mock3 = new MockCat3();
+  Expect.isTrue(mock3.eatFood("cat food", amount: 0.9));
+  Expect.isFalse(mock3.eatFood("cat food", amount: 0.3));
+
+  var g = new MockWithGenerics();
+  Expect.equals(g.doStuff(42), 142);
+  Expect.throws(() => g.doStuff('hi'));
+}