1 files changed, 19 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/xpcshell/head.js b/devtools/client/responsive/test/xpcshell/head.js
new file mode 100644
index 0000000000..7a7c7a09a0
--- /dev/null
+++ b/devtools/client/responsive/test/xpcshell/head.js
@@ -0,0 +1,19 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint no-unused-vars: [2, {"vars": "local"}] */
+
+const { require } = ChromeUtils.import("resource://devtools/shared/Loader.jsm");
+
+const promise = require("promise");
+const Services = require("Services");
+const Store = require("devtools/client/responsive/store");
+
+const DevToolsUtils = require("devtools/shared/DevToolsUtils");
+
+Services.prefs.setBoolPref("devtools.testing", true);
+registerCleanupFunction(() => {
+  Services.prefs.clearUserPref("devtools.testing");
+});