1 files changed, 87 insertions, 0 deletions
diff --git a/browser/components/sessionstore/test/browser_async_duplicate_tab.js b/browser/components/sessionstore/test/browser_async_duplicate_tab.js
new file mode 100644
index 0000000000..e592df93ed
--- /dev/null
+++ b/browser/components/sessionstore/test/browser_async_duplicate_tab.js
@@ -0,0 +1,87 @@
+"use strict";
+
+const PATH = getRootDirectory(gTestPath).replace(
+  "chrome://mochitests/content/",
+  "http://example.com/"
+);
+const URL = PATH + "file_async_duplicate_tab.html";
+
+add_task(async function test_duplicate() {
+  // Create new tab.
+  let tab = BrowserTestUtils.addTab(gBrowser, URL);
+  let browser = tab.linkedBrowser;
+  await promiseBrowserLoaded(browser);
+
+  // Flush to empty any queued update messages.
+  await TabStateFlusher.flush(browser);
+
+  // Click the link to navigate, this will add second shistory entry.
+  await SpecialPowers.spawn(browser, [], async function () {
+    return new Promise(resolve => {
+      docShell.chromeEventHandler.addEventListener(
+        "hashchange",
+        () => resolve(),
+        { once: true, capture: true }
+      );
+
+      // Click the link.
+      content.document.querySelector("a").click();
+    });
+  });
+
+  // Duplicate the tab.
+  let tab2 = ss.duplicateTab(window, tab);
+
+  // Wait until the tab has fully restored.
+  await promiseTabRestored(tab2);
+  await TabStateFlusher.flush(tab2.linkedBrowser);
+
+  // There should be two history entries now.
+  let { entries } = JSON.parse(ss.getTabState(tab2));
+  is(entries.length, 2, "there are two shistory entries");
+
+  // Cleanup.
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab);
+});
+
+add_task(async function test_duplicate_remove() {
+  // Create new tab.
+  let tab = BrowserTestUtils.addTab(gBrowser, URL);
+  let browser = tab.linkedBrowser;
+  await promiseBrowserLoaded(browser);
+
+  // Flush to empty any queued update messages.
+  await TabStateFlusher.flush(browser);
+
+  // Click the link to navigate, this will add second shistory entry.
+  await SpecialPowers.spawn(browser, [], async function () {
+    return new Promise(resolve => {
+      docShell.chromeEventHandler.addEventListener(
+        "hashchange",
+        () => resolve(),
+        { once: true, capture: true }
+      );
+
+      // Click the link.
+      content.document.querySelector("a").click();
+    });
+  });
+
+  // Duplicate the tab.
+  let tab2 = ss.duplicateTab(window, tab);
+
+  // Before the duplication finished, remove the tab.
+  await Promise.all([
+    promiseRemoveTabAndSessionState(tab),
+    promiseTabRestored(tab2),
+  ]);
+  await TabStateFlusher.flush(tab2.linkedBrowser);
+
+  // There should be two history entries now.
+  let { entries } = JSON.parse(ss.getTabState(tab2));
+  is(entries.length, 2, "there are two shistory entries");
+
+  // Cleanup.
+  BrowserTestUtils.removeTab(tab2);
+});