1 files changed, 40 insertions, 0 deletions
diff --git a/browser/base/content/test/general/browser_bug597218.js b/browser/base/content/test/general/browser_bug597218.js
new file mode 100644
index 0000000000..963912c9da
--- /dev/null
+++ b/browser/base/content/test/general/browser_bug597218.js
@@ -0,0 +1,40 @@
+/* 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 test() {
+  waitForExplicitFinish();
+
+  // establish initial state
+  is(gBrowser.tabs.length, 1, "we start with one tab");
+
+  // create a tab
+  let tab = gBrowser.addTab("about:blank", {
+    triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
+  });
+  ok(!tab.hidden, "tab starts out not hidden");
+  is(gBrowser.tabs.length, 2, "we now have two tabs");
+
+  // make sure .hidden is read-only
+  tab.hidden = true;
+  ok(!tab.hidden, "can't set .hidden directly");
+
+  // hide the tab
+  gBrowser.hideTab(tab);
+  ok(tab.hidden, "tab is hidden");
+
+  // now pin it and make sure it gets unhidden
+  gBrowser.pinTab(tab);
+  ok(tab.pinned, "tab was pinned");
+  ok(!tab.hidden, "tab was unhidden");
+
+  // try hiding it now that it's pinned; shouldn't be able to
+  gBrowser.hideTab(tab);
+  ok(!tab.hidden, "tab did not hide");
+
+  // clean up
+  gBrowser.removeTab(tab);
+  is(gBrowser.tabs.length, 1, "we finish with one tab");
+
+  finish();
+}