Improve test coverage for reflection on mixins.

tests/lib/mirrors/mixin_members_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.
+
+import "dart:mirrors";
+
+import "package:expect/expect.dart";
+
+setsEqual(Set a, Set b) => a.difference(b).length == 0 &&
+                           b.difference(a).length == 0;
+
+iterablesEqual(Iterable a, Iterable b) => setsEqual(a.toSet(), b.toSet());

[rmacnak, 2013/07/30 19:10:50]

This is a misleading name. I expect iterables to be equal iff they stream the
same elements in the same order. Perhaps

bool haveSameElements(Iterable a, Iterable b) {
  return a.every( (e) => b.contains(e) ) &&
         b.every( (e) => a.contains(e) );
}

?

[Michael Lippautz (Google), 2013/07/30 19:45:50]

Done.

+
+class S {
+  foo1() {}
+  foo2() {}
+}
+
+class M1 {
+  bar1() {}
+  bar2() {}
+}
+
+class M2 {
+  baz1() {}
+  baz2() {}
+}
+
+class O extends S with M1, M2 {}
+
+main() {
+  ClassMirror cm = reflectClass(O);
+  Classmirror S_M1_M2 = cm.superclass;
+  Classmirror S_M1 = S_M1_M2.superclass;
+  ClassMirror S = S_M1.superclass;
+  Expect.equals(true, cm.members.length == 0);

[rmacnak, 2013/07/30 19:10:50]

Expect.equals(0, cm.members.length)

[Michael Lippautz (Google), 2013/07/30 19:45:50]

Done.

+  Expect.equals(true, iterablesEqual(

[rmacnak, 2013/07/30 19:10:50]

Expect.isTrue(...)

[Michael Lippautz (Google), 2013/07/30 19:45:50]

Done.

+      S_M1_M2.members.keys, [const Symbol("baz1"), const Symbol("baz2")]));
+  Expect.equals(true, iterablesEqual(
+      S_M1.members.keys, [const Symbol("bar1"), const Symbol("bar2")]));
+  Expect.equals(true, iterablesEqual(
+      S.members.keys.toSet(), [const Symbol("foo1"), const Symbol("foo2")]));
+}