1 files changed, 51 insertions, 0 deletions
diff --git a/toolkit/modules/tests/browser/browser_Battery.js b/toolkit/modules/tests/browser/browser_Battery.js
new file mode 100644
index 000000000..2d3ba5da1
--- /dev/null
+++ b/toolkit/modules/tests/browser/browser_Battery.js
@@ -0,0 +1,51 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+"use strict";
+var imported = Components.utils.import("resource://gre/modules/Battery.jsm", this);
+Cu.import("resource://gre/modules/Services.jsm", this);
+
+function test() {
+  waitForExplicitFinish();
+
+  is(imported.Debugging.fake, false, "Battery spoofing is initially false")
+
+  GetBattery().then(function (battery) {
+    for (let k of ["charging", "chargingTime", "dischargingTime", "level"]) {
+      let backup = battery[k];
+      try {
+        battery[k] = "__magic__";
+      } catch (e) {
+        // We are testing that we cannot set battery to new values
+        // when "use strict" is enabled, this throws a TypeError
+        if (e.name != "TypeError")
+          throw e;
+      }
+      is(battery[k], backup, "Setting battery " + k + " preference without spoofing enabled should fail");
+    }
+
+    imported.Debugging.fake = true;
+
+    // reload again to get the fake one
+    GetBattery().then(function (battery) {
+      battery.charging = true;
+      battery.chargingTime = 100;
+      battery.level = 0.5;
+      ok(battery.charging, "Test for charging setter");
+      is(battery.chargingTime, 100, "Test for chargingTime setter");
+      is(battery.level, 0.5, "Test for level setter");
+
+      battery.charging = false;
+      battery.dischargingTime = 50;
+      battery.level = 0.7;
+      ok(!battery.charging, "Test for charging setter");
+      is(battery.dischargingTime, 50, "Test for dischargingTime setter");
+      is(battery.level, 0.7, "Test for level setter");
+
+      // Resetting the value to make the test run successful
+      // for multiple runs in same browser session.
+      imported.Debugging.fake = false;
+      finish();
+    });
+  });
+}