Bug 1415379 - Add the entire _tests directory to the sandbox whitelist. r=ahal,Alex_Gaynor

mochitests needs access to TESTING_JS_MODULES which are installed in $(OBJDIR)\_tests\modules\

MozReview-Commit-ID: CMgDlj4uKeP

--HG--
extra : rebase_source : 0a32b71db56bd68fc369d58117075dabf0465727

testing/mochitest/runtests.py

@@ -1832,7 +1832,9 @@ toolbar#nav-bar {
            '5.1' in platform.version() and options.e10s:
             prefs['layers.acceleration.disabled'] = True
 
-        sandbox_whitelist_paths = [SCRIPT_DIR] + options.sandboxReadWhitelist
+        # Whitelist the _tests directory (../..) so that TESTING_JS_MODULES work
+        tests_dir = os.path.dirname(os.path.dirname(SCRIPT_DIR))
+        sandbox_whitelist_paths = [tests_dir] + options.sandboxReadWhitelist
         if (platform.system() == "Linux" or
             platform.system() in ("Windows", "Microsoft")):
             # Trailing slashes are needed to indicate directories on Linux and Windows