Add corelib tests

test/codegen/corelib/list_iterators_test.dart

Index: test/codegen/corelib/list_iterators_test.dart
diff --git a/test/codegen/corelib/list_iterators_test.dart b/test/codegen/corelib/list_iterators_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..092082e4e160d5f12bfba2540e35e71053a24729
--- /dev/null
+++ b/test/codegen/corelib/list_iterators_test.dart
@@ -0,0 +1,50 @@
+// 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.
+
+import "package:expect/expect.dart";
+
+class ListIteratorsTest {
+  static void checkListIterator(List a) {
+    Iterator it = a.iterator;
+    Expect.isNull(it.current);
+    for (int i = 0; i < a.length; i++) {
+      Expect.isTrue(it.moveNext());
+      var elem = it.current;
+      Expect.equals(a[i], elem);
+    }
+    Expect.isFalse(it.moveNext());
+    Expect.isNull(it.current);
+  }
+
+  static testMain() {
+    checkListIterator([]);
+    checkListIterator([1, 2]);
+    checkListIterator(new List(0));
+    checkListIterator(new List(10));
+    checkListIterator(new List());
+    List g = new List();
+    g.addAll([1, 2, 3]);
+    checkListIterator(g);
+
+    // This is mostly undefined behavior.
+    Iterator it = g.iterator;
+    Expect.isTrue(it.moveNext());
+    Expect.equals(1, it.current);
+    Expect.isTrue(it.moveNext());
+    g[1] = 49;
+    // The iterator keeps the last value.
+    Expect.equals(2, it.current);
+    Expect.isTrue(it.moveNext());
+    g.removeLast();
+    // The iterator keeps the last value.
+    Expect.equals(3, it.current);
+    Expect.throws(it.moveNext, (e) => e is ConcurrentModificationError);
+    // No progress when throwing.
+    Expect.equals(3, it.current);
+  }
+}
+
+main() {
+  ListIteratorsTest.testMain();
+}