Extends native mixin tests.

tests/compiler/dart2js_native/native_mixin_multiple_test.dart

+// Copyright (c) 2013, 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.
+
+// Test that native classes can use ordinary Dart classes as mixins.
+
+class A native "*A" {
+  foo() => "A-foo";
+  baz() => "A-baz";
+}
+
+class B extends A with M1, M2 native "*B" {
+  bar() => baz();
+}
+
+class M1 {
+  foo() => "M1-foo";
+  baz() => "M1-baz";
+}
+
+class M2 {
+  foo() => "M2-foo";
+}
+
+A makeA() native;
+B makeB() native;
+
+void setup() native """
+function A() {}
+function B() {}
+makeA = function(){return new A;};
+makeB = function(){return new B;};
+""";
+
+main() {
+  setup();
+  A a = makeA();
+  Expect.equals("A-foo", a.foo());
+  Expect.throws(() => a.bar(), (error) => error is NoSuchMethodError);
+  Expect.equals("A-baz", a.baz());
+  Expect.isTrue(a is A);
+  Expect.isFalse(a is B);
+  Expect.isFalse(a is M1);
+  Expect.isFalse(a is M2);
+
+  B b = makeB();
+  Expect.equals("M2-foo", b.foo());
+  Expect.equals("M1-baz", b.bar());
+  Expect.equals("M1-baz", b.baz());
+  Expect.isTrue(b is A);
+  Expect.isTrue(b is B);
+  Expect.isTrue(b is M1);
+  Expect.isTrue(b is M2);
+
+  M1 m1 = new M1();
+  Expect.equals("M1-foo", m1.foo());
+  Expect.throws(() => m1.bar(), (error) => error is NoSuchMethodError);
+  Expect.equals("M1-baz", m1.baz());
+  Expect.isFalse(m1 is A);
+  Expect.isFalse(m1 is B);
+  Expect.isTrue(m1 is M1);
+  Expect.isFalse(m1 is M2);
+
+  M2 m2 = new M2();
+  Expect.equals("M2-foo", m2.foo());
+  Expect.throws(() => m2.bar(), (error) => error is NoSuchMethodError);
+  Expect.throws(() => m2.baz(), (error) => error is NoSuchMethodError);
+  Expect.isFalse(m2 is A);
+  Expect.isFalse(m2 is B);
+  Expect.isFalse(m2 is M1);
+  Expect.isTrue(m2 is M2);
+}