1 files changed, 36 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_465215.js b/browser/components/sessionstore/test/browser_465215.js
new file mode 100644
index 0000000000..d57d58509f
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_465215.js
@@ -0,0 +1,36 @@
+"use strict";
+
+var uniqueName = "bug 465215";
+var uniqueValue1 = "as good as unique: " + Date.now();
+var uniqueValue2 = "as good as unique: " + Math.random();
+
+add_task(async function () {
+  // set a unique value on a new, blank tab
+  let tab1 = BrowserTestUtils.addTab(gBrowser, "about:blank");
+  await promiseBrowserLoaded(tab1.linkedBrowser);
+  ss.setCustomTabValue(tab1, uniqueName, uniqueValue1);
+
+  // duplicate the tab with that value
+  let tab2 = ss.duplicateTab(window, tab1);
+  await promiseTabRestored(tab2);
+  is(
+    ss.getCustomTabValue(tab2, uniqueName),
+    uniqueValue1,
+    "tab value was duplicated"
+  );
+
+  ss.setCustomTabValue(tab2, uniqueName, uniqueValue2);
+  isnot(
+    ss.getCustomTabValue(tab1, uniqueName),
+    uniqueValue2,
+    "tab values aren't sync'd"
+  );
+
+  // overwrite the tab with the value which should remove it
+  await promiseTabState(tab1, { entries: [] });
+  is(ss.getCustomTabValue(tab1, uniqueName), "", "tab value was cleared");
+
+  // clean up
+  gBrowser.removeTab(tab2);
+  gBrowser.removeTab(tab1);
+});