Provide a way to get a Type back from a ClassMirror.

tests/lib/mirrors/reflected_type_test.dart

Index: tests/lib/mirrors/reflected_type_test.dart
diff --git a/tests/lib/mirrors/reflected_type_test.dart b/tests/lib/mirrors/reflected_type_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..df4e578c26eb52d58e01931685e245f6447ffa91
--- /dev/null
+++ b/tests/lib/mirrors/reflected_type_test.dart
@@ -0,0 +1,69 @@
+// 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.
+
+library test.reflected_type_test;
+
+import 'dart:mirrors';
+
+import 'package:expect/expect.dart';
+
+class A<T> {}
+class B extends A {}            // Same as class B extends A<dynamic>.
+class C extends A<num, int> {}  // Same as class C extends A<dynamic>.
+class D extends A<int> {}
+class E<S> extends A<S> {}
+class F<R> extends A<int> {}
+class G {}
+class H<A,B,C> {}
+
+expectReflectedType(classMirror, expectedType) {
+  if (expectedType == null) {
+    Expect.isFalse(classMirror.hasReflectedType);
+    Expect.throws(() => classMirror.reflectedType,
+                  (e) => e is UnsupportedError,
+                  "Should not have a reflected type");
+  } else {
+    Expect.isTrue(classMirror.hasReflectedType);
+    Expect.equals(expectedType, classMirror.reflectedType);
+  }
+}
+
+main() {
+  // Declarations.
+  expectReflectedType(reflectClass(A), null);
+  expectReflectedType(reflectClass(B), B);
+  expectReflectedType(reflectClass(C), C);
+  expectReflectedType(reflectClass(D), D);
+  expectReflectedType(reflectClass(E), null);
+  expectReflectedType(reflectClass(F), null);
+  expectReflectedType(reflectClass(G), G);
+  expectReflectedType(reflectClass(H), null);
+
+   // Instantiations.
+  expectReflectedType(reflect(new A()).type, new A().runtimeType);
+  expectReflectedType(reflect(new B()).type, new B().runtimeType);
+  expectReflectedType(reflect(new C()).type, new C().runtimeType);
+  expectReflectedType(reflect(new D()).type, new D().runtimeType);
+  expectReflectedType(reflect(new E()).type, new E().runtimeType);
+  expectReflectedType(reflect(new F()).type, new F().runtimeType);
+  expectReflectedType(reflect(new G()).type, new G().runtimeType);
+  expectReflectedType(reflect(new H()).type, new H().runtimeType);
+
+  expectReflectedType(reflect(new A<num>()).type, new A<num>().runtimeType);
+  expectReflectedType(reflect(new B<num>()).type.superclass,
+                      new A<dynamic>().runtimeType);
+  expectReflectedType(reflect(new C<num>()).type.superclass,
+                      new A<dynamic>().runtimeType);
+  expectReflectedType(reflect(new D<num>()).type.superclass,
+                      new A<int>().runtimeType);
+  expectReflectedType(reflect(new E<num>()).type, new E<num>().runtimeType);
+  // TODO(rmacnak): This requires some work to compute.
+  // expectReflectedType(reflect(new E<num>()).type.superclass,
+  //                     new A<num>().runtimeType);
+  expectReflectedType(reflect(new F<num>()).type.superclass,
+                      new A<int>().runtimeType);
+  expectReflectedType(reflect(new F<num>()).type, new F<num>().runtimeType);
+  expectReflectedType(reflect(new H<num, num, num>()).type,
+                      new H<num, num, num>().runtimeType);
+}