Add experimental expando support.

tests/corelib/expando_test.dart

Index: tests/corelib/expando_test.dart
diff --git a/tests/corelib/expando_test.dart b/tests/corelib/expando_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0217bdab6f271fd77593e56ec1f70101c1c54085
--- /dev/null
+++ b/tests/corelib/expando_test.dart
@@ -0,0 +1,61 @@
+// Copyright (c) 2012, 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.
+
+main() {
+  var legal = [ new Object(),
+                new List(), [1,2,3], const [1,2,3],
+                new Map(), {'x':1,'y':2}, const {'x':1,'y':2},
+                new Expando(), new Expando('horse') ];
+  for (var object in legal) {
+    testNamedExpando(object);
+    testUnnamedExpando(object);
+  }

[Ivan Posva, 2012/06/11 12:08:08]

Currently you are only testing adding a specific expando to one object, but not
adding the same expando property to many objects. How about adding a static or
top-level expando to all tested objects?

[kasperl, 2012/06/11 12:44:39]

Done.

+  testIllegal();
+}
+
+testNamedExpando(object) {
+  Expando<int> expando = new Expando<int>('myexpando');
+  Expect.equals('myexpando', expando.name);
+  Expect.isTrue(expando.toString().startsWith('Expando:myexpando'));
+  testExpando(expando, object);
+}
+
+testUnnamedExpando(object) {
+  Expando<int> expando = new Expando<int>();
+  Expect.isNull(expando.name);
+  Expect.isTrue(expando.toString().startsWith('Expando:'));
+  testExpando(expando, object);
+}
+
+testExpando(Expando<int> expando, object) {
+  Expect.isNull(expando[object]);
+  expando[object] = 42;
+  Expect.equals(42, expando[object]);
+  expando[object] = null;
+  Expect.isNull(expando[object]);
+
+  Expando<int> alternative = new Expando('myexpando');

[Ivan Posva, 2012/06/11 12:08:08]

You might also want to do this while having the original expando registered.

[kasperl, 2012/06/11 12:44:39]

Done.

+  Expect.isNull(alternative[object]);
+  alternative[object] = 87;
+  Expect.isNull(expando[object]);
+  Expect.equals(87, alternative[object]);
+}
+
+testIllegal() {
+  Expando<int> expando = new Expando<int>();
+  Expect.throws(() => expando[null], (exception)
+      => exception is NullPointerException);
+  Expect.throws(() => expando['string'], (exception)
+      => exception is IllegalArgumentException);
+  Expect.throws(() => expando['string'], (exception)
+      => exception is IllegalArgumentException);
+  Expect.throws(() => expando[42], (exception)
+      => exception is IllegalArgumentException);
+  Expect.throws(() => expando[42.87], (exception)
+      => exception is IllegalArgumentException);
+  Expect.throws(() => expando[true], (exception)
+      => exception is IllegalArgumentException);
+  Expect.throws(() => expando[false], (exception)
+      => exception is IllegalArgumentException);
+}