1 files changed, 56 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_restore_tabless_window.js b/browser/components/sessionstore/test/browser_restore_tabless_window.js
new file mode 100644
index 0000000000..cffb2159f5
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_restore_tabless_window.js
@@ -0,0 +1,56 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/**
+ * It's possible for us to restore windows without tabs,
+ * when on Windows/Linux the user closes the last tab as
+ * a means of closing the last window. That last tab
+ * would appear as a closed tab in session state for the
+ * window, with no open tabs (so the state would be resumed
+ * as showing the homepage). See bug 490136 for context.
+ * This test checks that in this case, the resulting window
+ * is functional and indeed has the required previously
+ * closed tabs available.
+ */
+add_task(async function test_restoring_tabless_window() {
+  let newWin = await BrowserTestUtils.openNewBrowserWindow();
+  let newState = {
+    windows: [
+      {
+        tabs: [],
+        _closedTabs: [
+          {
+            state: { entries: [{ url: "about:" }] },
+            title: "About:",
+          },
+        ],
+      },
+    ],
+  };
+
+  await setWindowState(newWin, newState, true);
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    newWin.gBrowser,
+    "https://example.com"
+  );
+  await TabStateFlusher.flush(tab.linkedBrowser);
+  let receivedState = SessionStore.getWindowState(newWin);
+  let { tabs, selected } = receivedState.windows[0];
+  is(tabs.length, 2, "Should have two tabs");
+  is(selected, 2, "Should have selected the new tab");
+  ok(
+    tabs[1]?.entries.some(e => e.url == "https://example.com/"),
+    "Should have found the new URL"
+  );
+
+  let closedTabData = SessionStore.getClosedTabDataForWindow(newWin);
+  is(closedTabData.length, 1, "Should have found 1 closed tab");
+  is(
+    closedTabData[0]?.state.entries[0].url,
+    "about:",
+    "Should have found the right URL for the closed tab"
+  );
+  await BrowserTestUtils.closeWindow(newWin);
+});