Add corelib tests

test/codegen/corelib/for_in_test.dart

+// 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 ForInTest {
+  static testMain() {
+    testSimple();
+    testBreak();
+    testContinue();
+    testClosure();
+  }
+
+  static Set<int> getSmallSet() {
+    Set<int> set = new Set<int>();
+    set.add(1);
+    set.add(2);
+    set.add(4);
+    return set;
+  }
+
+  static void testSimple() {
+    Set<int> set = getSmallSet();
+    int count = 0;
+    for (final i in set) {
+      count += i;
+    }
+    Expect.equals(7, count);
+
+    count = 0;
+    for (var i in set) {
+      count += i;
+    }
+    Expect.equals(7, count);
+
+    count = 0;
+    for (int i in set) {
+      count += i;
+    }
+    Expect.equals(7, count);
+
+    count = 0;
+    for (final int i in set) {
+      count += i;
+    }
+    Expect.equals(7, count);
+
+    count = 0;
+    int i = 0;
+    Expect.equals(false, set.contains(i));  // Used to test [i] after loop.
+    for (i in set) {
+      count += i;
+    }
+    Expect.equals(7, count);
+    Expect.equals(true, set.contains(i));
+    // The default implementation of [Set] preserves order.
+    Expect.equals(4, i);
+  }
+
+  static void testBreak() {
+    Set<int> set = getSmallSet();
+    int count = 0;
+    for (final i in set) {
+      if (i == 4) break;
+      count += i;
+    }
+    Expect.equals(true, count < 4);
+  }
+
+  static void testContinue() {
+    Set<int> set = getSmallSet();
+    int count = 0;
+    for (final i in set) {
+      if (i < 4) continue;
+      count += i;
+    }
+    Expect.equals(4, count);
+  }
+
+  static void testClosure() {
+    Set<int> set = getSmallSet();
+    List<Function> closures = new List(set.length);
+    int index = 0;
+    for (var i in set) {
+      closures[index++] = () => i;
+    }
+
+    Expect.equals(index, set.length);
+    Expect.equals(7, closures[0]() + closures[1]() + closures[2]());
+  }
+}
+
+main() {
+  ForInTest.testMain();
+}