1 files changed, 42 insertions, 0 deletions
diff --git a/toolkit/components/contentprefs/tests/unit/test_bug248970.js b/toolkit/components/contentprefs/tests/unit/test_bug248970.js
new file mode 100644
index 000000000..5f4aa25c5
--- /dev/null
+++ b/toolkit/components/contentprefs/tests/unit/test_bug248970.js
@@ -0,0 +1,42 @@
+/* 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/. */
+
+function run_test() {
+    let loadContext = { get usePrivateBrowsing() { return gInPrivateBrowsing; } };
+
+    ContentPrefTest.deleteDatabase();
+    var cp = new ContentPrefInstance(loadContext);
+    do_check_neq(cp, null, "Retrieving the content prefs service failed");
+
+    try {
+      const uri1 = ContentPrefTest.getURI("http://www.example.com/");
+      const uri2 = ContentPrefTest.getURI("http://www.anotherexample.com/");
+      const pref_name = "browser.content.full-zoom";
+      const zoomA = 1.5, zoomA_new = 0.8, zoomB = 1.3;
+      // save Zoom-A
+      cp.setPref(uri1, pref_name, zoomA);
+      // make sure Zoom-A is retrievable
+      do_check_eq(cp.getPref(uri1, pref_name), zoomA);
+      // enter private browsing mode
+      enterPBMode();
+      // make sure Zoom-A is retrievable
+      do_check_eq(cp.getPref(uri1, pref_name), zoomA);
+      // save Zoom-B
+      cp.setPref(uri2, pref_name, zoomB);
+      // make sure Zoom-B is retrievable
+      do_check_eq(cp.getPref(uri2, pref_name), zoomB);
+      // update Zoom-A
+      cp.setPref(uri1, pref_name, zoomA_new);
+      // make sure Zoom-A has changed
+      do_check_eq(cp.getPref(uri1, pref_name), zoomA_new);
+      // exit private browsing mode
+      exitPBMode();
+      // make sure Zoom-A change has not persisted
+      do_check_eq(cp.getPref(uri1, pref_name), zoomA);
+      // make sure Zoom-B change has not persisted
+      do_check_eq(cp.hasPref(uri2, pref_name), false);
+    } catch (e) {
+      do_throw("Unexpected exception: " + e);
+    }
+}