Check for correct behavior when invoking reflectClass() with incorrect arguments.

tests/lib/mirrors/reflect_class_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";
+
+typedef void FooFunction(int a, double b);
+
+main() {
+  Function expectedError = (e) => e is ArgumentError;
+
+  Expect.throws(() => reflectClass(dynamic), expectedError);
+  Expect.throws(() => reflectClass(1), expectedError);

[rmacnak, 2013/09/18 22:52:06]

These checks fail with TypeErrors in checked mode. Maybe we should skip this in
checked mode? Peter?

+  Expect.throws(() => reflectClass("string"), expectedError);
+
+  // reflectClass() on a function type should fail once typedefs are represented
+  // by TypedefMirrors instead of ClassMirrors.
+  // Expect.throws(() => reflectClass(FooFunction), expectedError);
+}