1 files changed, 52 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_multiselect_tabs_active_tab_selected_by_default.js b/browser/base/content/test/tabs/browser_multiselect_tabs_active_tab_selected_by_default.js
new file mode 100644
index 0000000000..8edf56d3d4
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_multiselect_tabs_active_tab_selected_by_default.js
@@ -0,0 +1,52 @@
+add_task(async function multiselectActiveTabByDefault() {
+  const tab1 = await addTab();
+  const tab2 = await addTab();
+  const tab3 = await addTab();
+
+  await BrowserTestUtils.switchTab(gBrowser, tab1);
+
+  info("Try multiselecting Tab1 (active) with click+CtrlKey");
+  await triggerClickOn(tab1, { ctrlKey: true });
+
+  is(gBrowser.selectedTab, tab1, "Tab1 is active");
+  ok(
+    !tab1.multiselected,
+    "Tab1 is not multi-selected because we are not in multi-select context yet"
+  );
+  ok(!tab2.multiselected, "Tab2 is not multi-selected");
+  ok(!tab3.multiselected, "Tab3 is not multi-selected");
+  is(gBrowser.multiSelectedTabsCount, 0, "Zero tabs multi-selected");
+
+  info("We multi-select tab1 and tab2 with ctrl key down");
+  await triggerClickOn(tab2, { ctrlKey: true });
+  await triggerClickOn(tab3, { ctrlKey: true });
+
+  is(gBrowser.selectedTab, tab1, "Tab1 is active");
+  ok(tab1.multiselected, "Tab1 is multi-selected");
+  ok(tab2.multiselected, "Tab2 is multi-selected");
+  ok(tab3.multiselected, "Tab3 is multi-selected");
+  is(gBrowser.multiSelectedTabsCount, 3, "Three tabs multi-selected");
+  is(
+    gBrowser.lastMultiSelectedTab,
+    tab3,
+    "Tab3 is the last multi-selected tab"
+  );
+
+  info("Unselect tab1 from multi-selection using ctrlKey");
+
+  await BrowserTestUtils.switchTab(
+    gBrowser,
+    triggerClickOn(tab1, { ctrlKey: true })
+  );
+
+  isnot(gBrowser.selectedTab, tab1, "Tab1 is not active anymore");
+  is(gBrowser.selectedTab, tab3, "Tab3 is active");
+  ok(!tab1.multiselected, "Tab1 is not multi-selected");
+  ok(tab2.multiselected, "Tab2 is multi-selected");
+  ok(tab3.multiselected, "Tab3 is multi-selected");
+  is(gBrowser.multiSelectedTabsCount, 2, "Two tabs multi-selected");
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab3);
+});