Add test that checks that the default constructor is called.

tests/language/src/ConstructorDefaultTest.dart

Index: tests/language/src/ConstructorDefaultTest.dart
diff --git a/tests/language/src/ConstructorDefaultTest.dart b/tests/language/src/ConstructorDefaultTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..9154ed4a61c9f61e33f3515defde9d5d6368d156
--- /dev/null
+++ b/tests/language/src/ConstructorDefaultTest.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2011, 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.
+// Dart test program for default constructors.
+
+class A {
+  A() : a = 499;
+
+  var a;
+}
+
+class B extends A {
+  B() { Expect.equals(499, a); }
+}
+
+main() {
+  new B();
+}