1 files changed, 53 insertions, 0 deletions
diff --git a/toolkit/components/reader/test/browser_bug1124271_readerModePinnedTab.js b/toolkit/components/reader/test/browser_bug1124271_readerModePinnedTab.js
new file mode 100644
index 0000000000..346d503675
--- /dev/null
+++ b/toolkit/components/reader/test/browser_bug1124271_readerModePinnedTab.js
@@ -0,0 +1,53 @@
+/* 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/. */
+
+// Test that the reader mode button won't open in a new tab when clicked from a pinned tab
+
+const PREF = "reader.parse-on-load.enabled";
+
+const TEST_PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content",
+  "https://example.com"
+);
+
+var readerButton = document.getElementById("reader-mode-button");
+
+add_task(async function () {
+  registerCleanupFunction(function () {
+    Services.prefs.clearUserPref(PREF);
+    while (gBrowser.tabs.length > 1) {
+      gBrowser.removeCurrentTab();
+    }
+  });
+
+  // Enable the reader mode button.
+  Services.prefs.setBoolPref(PREF, true);
+
+  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser));
+  gBrowser.pinTab(tab);
+
+  let initialTabsCount = gBrowser.tabs.length;
+
+  // Point tab to a test page that is reader-able.
+  let url = TEST_PATH + "readerModeArticle.html";
+  await promiseTabLoadEvent(tab, url);
+  await TestUtils.waitForCondition(() => !readerButton.hidden);
+
+  readerButton.click();
+  await promiseTabLoadEvent(tab);
+
+  // Ensure no new tabs are opened when exiting reader mode in a pinned tab
+  is(gBrowser.tabs.length, initialTabsCount, "No additional tabs were opened.");
+
+  let pageShownPromise = BrowserTestUtils.waitForContentEvent(
+    tab.linkedBrowser,
+    "pageshow"
+  );
+  readerButton.click();
+  await pageShownPromise;
+  // Ensure no new tabs are opened when exiting reader mode in a pinned tab
+  is(gBrowser.tabs.length, initialTabsCount, "No additional tabs were opened.");
+
+  gBrowser.removeCurrentTab();
+});