Add corelib tests

test/codegen/corelib/is_operator_basic_types_test.dart

Index: test/codegen/corelib/is_operator_basic_types_test.dart
diff --git a/test/codegen/corelib/is_operator_basic_types_test.dart b/test/codegen/corelib/is_operator_basic_types_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..4c0aea93d97099a08f4c37dcdcfbf4c5f8032675
--- /dev/null
+++ b/test/codegen/corelib/is_operator_basic_types_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.
+// Dart test program for the "is" type test operator.
+
+import "package:expect/expect.dart";
+
+check(args) {
+  var list = args[0];
+  var string = args[1];
+  var nullObject = args[2];
+
+  Expect.isTrue(list is Object);
+  Expect.isTrue(list is List);
+  Expect.isTrue(list is Iterable);
+  Expect.isFalse(list is Comparable);
+  Expect.isFalse(list is Pattern);
+  Expect.isFalse(list is String);
+
+  Expect.isFalse(list is !List);
+  Expect.isFalse(list is !Iterable);
+  Expect.isTrue(list is !Comparable);
+  Expect.isTrue(list is !Pattern);
+  Expect.isTrue(list is !String);
+
+  Expect.isTrue(string is Object);
+  Expect.isFalse(string is List);
+  Expect.isFalse(string is Iterable);
+  Expect.isTrue(string is Comparable);
+  Expect.isTrue(string is Pattern);
+  Expect.isTrue(string is String);
+
+  Expect.isTrue(string is !List);
+  Expect.isTrue(string is !Iterable);
+  Expect.isFalse(string is !Comparable);
+  Expect.isFalse(string is !Pattern);
+  Expect.isFalse(string is !String);
+
+  Expect.isTrue(nullObject is Object);
+  Expect.isFalse(nullObject is List);
+  Expect.isFalse(nullObject is Iterable);
+  Expect.isFalse(nullObject is Comparable);
+  Expect.isFalse(nullObject is Pattern);
+  Expect.isFalse(nullObject is String);
+
+  Expect.isTrue(nullObject is !List);
+  Expect.isTrue(nullObject is !Iterable);
+  Expect.isTrue(nullObject is !Comparable);
+  Expect.isTrue(nullObject is !Pattern);
+  Expect.isTrue(nullObject is !String);
+}
+
+main() {
+  // Try to make it hard for an optimizing compiler to inline the
+  // tests.
+  check([[], 'string', null]);
+
+  // Try to make it even harder.
+  var string = new String.fromCharCodes([new DateTime.now().year % 100 + 1]);
+  check([string.codeUnits, string, null]);
+}