Add corelib tests

test/codegen/corelib/reg_exp4_test.dart

Index: test/codegen/corelib/reg_exp4_test.dart
diff --git a/test/codegen/corelib/reg_exp4_test.dart b/test/codegen/corelib/reg_exp4_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f8f63c1440995bcc9a45a40e7216edea22f4cb82
--- /dev/null
+++ b/test/codegen/corelib/reg_exp4_test.dart
@@ -0,0 +1,49 @@
+// 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 for testing regular expressions in Dart.
+
+import "package:expect/expect.dart";
+
+main() {
+  try {
+    RegExp ex = new RegExp(null);
+    Expect.fail("Expected: ArgumentError got: no exception");
+  } catch (ex) {
+    if (!(ex is ArgumentError)) {
+      Expect.fail("Expected: ArgumentError got: ${ex}");
+    }
+  }
+  try {
+    new RegExp(r"^\w+$").hasMatch(null);
+    Expect.fail("Expected: ArgumentError got: no exception");
+  } catch (ex) {
+    if (!(ex is ArgumentError)) {
+      Expect.fail("Expected: ArgumentError got: ${ex}");
+    }
+  }
+  try {
+    new RegExp(r"^\w+$").firstMatch(null);
+    Expect.fail("Expected: ArgumentError got: no exception");
+  } catch (ex) {
+    if (!(ex is ArgumentError)) {
+      Expect.fail("Expected: ArgumentError got: ${ex}");
+    }
+  }
+  try {
+    new RegExp(r"^\w+$").allMatches(null);
+    Expect.fail("Expected: ArgumentError got: no exception");
+  } catch (ex) {
+    if (!(ex is ArgumentError)) {
+      Expect.fail("Expected: ArgumentError got: ${ex}");
+    }
+  }
+  try {
+    new RegExp(r"^\w+$").stringMatch(null);
+    Expect.fail("Expected: ArgumentError got: no exception");
+  } catch (ex) {
+    if (!(ex is ArgumentError)) {
+      Expect.fail("Expected: ArgumentError got: ${ex}");
+    }
+  }
+}