1 files changed, 34 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/duplicate-flags.js b/js/src/tests/test262/built-ins/RegExp/duplicate-flags.js
new file mode 100644
index 0000000000..a36c45fa49
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/duplicate-flags.js
@@ -0,0 +1,34 @@
+// Copyright 2017 the V8 project authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    RegExpInitialize ( obj, pattern, flags )
+      5. If F contains any code unit other than "g", "i", "m", "s", "u", or "y" or if it contains the same code unit more than once, throw a SyntaxError exception.
+esid: sec-regexpinitialize
+description: Check that duplicate RegExp flags are disallowed
+features: [regexp-dotall, regexp-match-indices]
+---*/
+
+new RegExp("", "mig"); // single g will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "migg"), "duplicate g");
+
+new RegExp("", "i"); // single i will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "ii"), "duplicate i");
+
+new RegExp("", "m"); // single m will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "mm"), "duplicate m");
+
+new RegExp("", "s"); // single s will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "ss"), "duplicate s");
+
+new RegExp("", "u"); // single u will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "uu"), "duplicate u");
+
+new RegExp("", "y"); // single y will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "yy"), "duplicate y");
+
+new RegExp("", "d"); // single d will not throw SyntaxError
+assert.throws(SyntaxError, () => new RegExp("", "dd"), "duplicate d");
+
+reportCompare(0, 0);