diff -r 000000000000 -r 6474c204b198 js/src/gdb/tests/test-JSObject.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/gdb/tests/test-JSObject.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+# Printing JSObjects.
+
+assert_subprinter_registered('SpiderMonkey', 'ptr-to-JSObject')
+assert_subprinter_registered('SpiderMonkey', 'ref-to-JSObject')
+
+run_fragment('JSObject.simple')
+
+# These patterns look a little strange because of prolog.py's 'set print
+# address off', which avoids putting varying addresses in the output. After
+# the '(JSObject *) ', there is a 'void *' value printing as the empty
+# string.
+
+assert_pretty('glob', '(JSObject *)  [object global] delegate')
+assert_pretty('plain', '(JSObject *)  [object Object]')
+assert_pretty('func', '(JSObject *)  [object Function "dys"]')
+assert_pretty('anon', '(JSObject *)  [object Function <unnamed>]')
+assert_pretty('funcPtr', '(JSFunction *)  [object Function "formFollows"]')
+
+assert_pretty('plainRef', '(JSObject &) @ [object Object]')
+assert_pretty('funcRef', '(JSFunction &) @ [object Function "formFollows"]')