1 files changed, 53 insertions, 0 deletions
diff --git a/devtools/client/shared/test/browser_prefs-01.js b/devtools/client/shared/test/browser_prefs-01.js
new file mode 100644
index 0000000000..2989cdee57
--- /dev/null
+++ b/devtools/client/shared/test/browser_prefs-01.js
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the preference helpers work properly.
+
+const { PrefsHelper } = require("resource://devtools/client/shared/prefs.js");
+
+function test() {
+  const Prefs = new PrefsHelper("devtools.debugger", {
+    foo: ["Bool", "enabled"],
+  });
+
+  const originalPrefValue = Services.prefs.getBoolPref(
+    "devtools.debugger.enabled"
+  );
+  is(Prefs.foo, originalPrefValue, "The pref value was correctly fetched.");
+
+  Prefs.foo = !originalPrefValue;
+  is(Prefs.foo, !originalPrefValue, "The pref was was correctly changed (1).");
+  is(
+    Services.prefs.getBoolPref("devtools.debugger.enabled"),
+    !originalPrefValue,
+    "The pref was was correctly changed (2)."
+  );
+
+  Services.prefs.setBoolPref("devtools.debugger.enabled", originalPrefValue);
+  info("The pref value was reset (1).");
+  is(
+    Prefs.foo,
+    !originalPrefValue,
+    "The cached pref value hasn't changed yet (1)."
+  );
+
+  Services.prefs.setBoolPref("devtools.debugger.enabled", !originalPrefValue);
+  info("The pref value was reset (2).");
+  is(
+    Prefs.foo,
+    !originalPrefValue,
+    "The cached pref value hasn't changed yet (2)."
+  );
+
+  Prefs.registerObserver();
+
+  Services.prefs.setBoolPref("devtools.debugger.enabled", originalPrefValue);
+  info("The pref value was reset (3).");
+  is(Prefs.foo, originalPrefValue, "The cached pref value has changed now.");
+
+  Prefs.unregisterObserver();
+
+  finish();
+}