1 files changed, 35 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_removeTabsToTheStart.js b/browser/base/content/test/tabs/browser_removeTabsToTheStart.js
new file mode 100644
index 0000000000..685da35881
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_removeTabsToTheStart.js
@@ -0,0 +1,35 @@
+/* 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/. */
+
+add_task(async function removeTabsToTheStart() {
+  // don't mess with the original tab
+  let originalTab = gBrowser.selectedTab;
+  gBrowser.pinTab(originalTab);
+
+  // Add three new tabs after the original tab. Pin the second one.
+  let firstTab = await addTab();
+  let pinnedTab = await addTab();
+  let lastTab = await addTab();
+  gBrowser.pinTab(pinnedTab);
+
+  // Check that there is only one closable tab from lastTab to the start
+  is(
+    gBrowser.getTabsToTheStartFrom(lastTab).length,
+    1,
+    "One unpinned tab towards the start"
+  );
+
+  // Remove tabs to the start
+  gBrowser.removeTabsToTheStartFrom(lastTab);
+
+  ok(firstTab.closing, "First tab is closing");
+  ok(!pinnedTab.closing, "Pinned tab is not closing");
+  ok(!lastTab.closing, "Last tab is not closing");
+
+  // cleanup
+  gBrowser.unpinTab(originalTab);
+  for (let tab of [pinnedTab, lastTab]) {
+    BrowserTestUtils.removeTab(tab);
+  }
+});