diff -r 000000000000 -r 6474c204b198 js/src/gdb/tests/test-JSString.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/gdb/tests/test-JSString.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+# Printing JSStrings.
+
+assert_subprinter_registered('SpiderMonkey', 'ptr-to-JSString')
+run_fragment('JSString.simple')
+
+assert_pretty('empty', '""')
+assert_pretty('x', '"x"')
+assert_pretty('z', '"z"')
+assert_pretty('xz', '"xz"')
+
+stars = gdb.parse_and_eval('stars')
+assert_eq(str(stars), "'*' <repeats 100 times>")
+
+doubleStars = gdb.parse_and_eval('doubleStars')
+assert_eq(str(doubleStars), "'*' <repeats 200 times>")
+
+assert_pretty('xRaw', '"x"')
+
+# JSAtom *
+
+run_fragment('JSString.atom')
+
+assert_pretty('molybdenum', '"molybdenum"')