Add two constructor tests

tests/language/src/Constructor2Test.dart

Index: tests/language/src/Constructor2Test.dart
===================================================================
--- tests/language/src/Constructor2Test.dart	(revision 0)
+++ tests/language/src/Constructor2Test.dart	(revision 0)
@@ -0,0 +1,41 @@
+// 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 constructors and initializers.
+
+// Expect the initializer expressions E(i) to be evaluated
+// in the order 1, 2, 3, ...
+// Each expression must be evaluated exactly once.
+
+String trace = "";
+
+int E(int i) {
+  trace += "$i-";
+  return i;
+}
+
+class A {
+  var a1;
+  A(x, y) : a1 = E(4) {
+    Expect.equals(2, x);
+    Expect.equals(3, y);
+    Expect.equals(4, a1);
+    E(6);
+  }
+}
+
+class B extends A {
+  var b1, b2;
+
+  B(x) : b1 = E(1), super(E(2), E(3)), b2 = E(5) {
+    Expect.equals(1, b1);
+    Expect.equals(5, b2);
+    E(7);
+  }
+}
+
+main() {
+  var b = new B(0);
+  print(trace);

[siva, 2011/10/28 20:29:32]

Do you want to leave this print in the test? The verification in the next line
should be good enough right.

If you leave it in, the test might fail on Dartium as they don't have print
implemented.

[hausner, 2011/10/28 21:27:30]

Thanks for the warning. Removed.

+  Expect.equals("1-2-3-4-5-6-7-", trace);
+}