1 files changed, 41 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_tab_label_during_reload.js b/browser/base/content/test/tabs/browser_tab_label_during_reload.js
new file mode 100644
index 0000000000..ec0728c34a
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_tab_label_during_reload.js
@@ -0,0 +1,41 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function () {
+  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(
+    gBrowser,
+    "about:preferences"
+  ));
+  let browser = tab.linkedBrowser;
+  let labelChanges = 0;
+  let attrModifiedListener = event => {
+    if (event.detail.changed.includes("label")) {
+      labelChanges++;
+    }
+  };
+  tab.addEventListener("TabAttrModified", attrModifiedListener);
+
+  await BrowserTestUtils.browserLoaded(browser);
+  is(labelChanges, 1, "number of label changes during initial load");
+  isnot(tab.label, "", "about:preferences tab label isn't empty");
+  isnot(
+    tab.label,
+    "about:preferences",
+    "about:preferences tab label isn't the URI"
+  );
+  is(
+    tab.label,
+    browser.contentTitle,
+    "about:preferences tab label matches browser.contentTitle"
+  );
+
+  labelChanges = 0;
+  browser.reload();
+  await BrowserTestUtils.browserLoaded(browser);
+  is(labelChanges, 0, "number of label changes during reload");
+
+  tab.removeEventListener("TabAttrModified", attrModifiedListener);
+  gBrowser.removeTab(tab);
+});