1 files changed, 33 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_624727.js b/browser/components/sessionstore/test/browser_624727.js
new file mode 100644
index 0000000000..074ea7599d
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_624727.js
@@ -0,0 +1,33 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+var TEST_STATE = { windows: [{ tabs: [{ url: "about:blank" }] }] };
+
+add_task(async function () {
+  function assertNumberOfTabs(num, msg) {
+    is(gBrowser.tabs.length, num, msg);
+  }
+
+  function assertNumberOfPinnedTabs(num, msg) {
+    is(gBrowser._numPinnedTabs, num, msg);
+  }
+
+  // check prerequisites
+  assertNumberOfTabs(1, "we start off with one tab");
+  assertNumberOfPinnedTabs(0, "no pinned tabs so far");
+
+  // setup
+  BrowserTestUtils.addTab(gBrowser, "about:blank");
+  assertNumberOfTabs(2, "there are two tabs, now");
+
+  let [tab1, tab2] = gBrowser.tabs;
+  gBrowser.pinTab(tab1);
+  gBrowser.pinTab(tab2);
+  assertNumberOfPinnedTabs(2, "both tabs are now pinned");
+
+  // run the test
+  await promiseBrowserState(TEST_STATE);
+
+  assertNumberOfTabs(1, "one tab left after setBrowserState()");
+  assertNumberOfPinnedTabs(0, "there are no pinned tabs");
+});