1 files changed, 76 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js b/browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js
new file mode 100644
index 0000000000..c61b37c1a4
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_scrollPositionsReaderMode.js
@@ -0,0 +1,76 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const BASE = "http://example.com/browser/browser/components/sessionstore/test/";
+const READER_MODE_URL =
+  "about:reader?url=" +
+  encodeURIComponent(BASE + "browser_scrollPositions_readerModeArticle.html");
+
+// Randomized set of scroll positions we will use in this test.
+const SCROLL_READER_MODE_Y = Math.round(400 * (1 + Math.random()));
+const SCROLL_READER_MODE_STR = "0," + SCROLL_READER_MODE_Y;
+
+requestLongerTimeout(2);
+
+/**
+ * Test that scroll positions of about reader page after restoring background
+ * tabs in a restored window (bug 1153393).
+ */
+add_task(async function test_scroll_background_about_reader_tabs() {
+  await pushPrefs(["browser.sessionstore.restore_on_demand", true]);
+
+  let newWin = await BrowserTestUtils.openNewBrowserWindow();
+  let tab = BrowserTestUtils.addTab(newWin.gBrowser, READER_MODE_URL);
+  let browser = tab.linkedBrowser;
+  await Promise.all([
+    BrowserTestUtils.browserLoaded(browser),
+    BrowserTestUtils.waitForContentEvent(browser, "AboutReaderContentReady"),
+  ]);
+
+  // Scroll down a little.
+  await setScrollPosition(browser, 0, SCROLL_READER_MODE_Y);
+  await checkScroll(tab, { scroll: SCROLL_READER_MODE_STR }, "scroll is fine");
+
+  // Close the window
+  await BrowserTestUtils.closeWindow(newWin);
+
+  await forceSaveState();
+
+  // Now restore the window
+  newWin = ss.undoCloseWindow(0);
+
+  // Make sure to wait for the window to be restored.
+  await BrowserTestUtils.waitForEvent(newWin, "SSWindowStateReady");
+
+  is(newWin.gBrowser.tabs.length, 2, "There should be two tabs");
+
+  // The second tab should be the one we loaded URL at still
+  tab = newWin.gBrowser.tabs[1];
+
+  ok(tab.hasAttribute("pending"), "Tab should be pending");
+  browser = tab.linkedBrowser;
+
+  // Ensure there are no pending queued messages in the child.
+  await TabStateFlusher.flush(browser);
+
+  // Now check to see if the background tab remembers where it
+  // should be scrolled to.
+  newWin.gBrowser.selectedTab = tab;
+  await Promise.all([
+    promiseTabRestored(tab),
+    BrowserTestUtils.waitForContentEvent(
+      tab.linkedBrowser,
+      "AboutReaderContentReady"
+    ),
+  ]);
+
+  await checkScroll(
+    tab,
+    { scroll: SCROLL_READER_MODE_STR },
+    "scroll is still fine"
+  );
+
+  await BrowserTestUtils.closeWindow(newWin);
+});