1 files changed, 72 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_multiselect_tabs_using_selectedTabs.js b/browser/base/content/test/tabs/browser_multiselect_tabs_using_selectedTabs.js
new file mode 100644
index 0000000000..0db980bf6b
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_multiselect_tabs_using_selectedTabs.js
@@ -0,0 +1,72 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+add_task(async function () {
+  function testSelectedTabs(tabs) {
+    is(
+      gBrowser.tabContainer.getAttribute("aria-multiselectable"),
+      "true",
+      "tabbrowser should be marked as aria-multiselectable"
+    );
+    gBrowser.selectedTabs = tabs;
+    let { selectedTab, selectedTabs, _multiSelectedTabsSet } = gBrowser;
+    is(selectedTab, tabs[0], "The selected tab should be the expected one");
+    if (tabs.length == 1) {
+      ok(
+        !selectedTab.multiselected,
+        "Selected tab shouldn't be multi-selected because we are not in multi-select context yet"
+      );
+      ok(
+        !_multiSelectedTabsSet.has(selectedTab),
+        "Selected tab shouldn't be in _multiSelectedTabsSet"
+      );
+      is(selectedTabs.length, 1, "selectedTabs should contain a single tab");
+      is(
+        selectedTabs[0],
+        selectedTab,
+        "selectedTabs should contain the selected tab"
+      );
+      ok(
+        !selectedTab.hasAttribute("aria-selected"),
+        "Selected tab shouldn't be marked as aria-selected when only one tab is selected"
+      );
+    } else {
+      const uniqueTabs = [...new Set(tabs)];
+      is(
+        selectedTabs.length,
+        uniqueTabs.length,
+        "Check number of selected tabs"
+      );
+      for (let tab of uniqueTabs) {
+        ok(tab.multiselected, "Tab should be multi-selected");
+        ok(
+          _multiSelectedTabsSet.has(tab),
+          "Tab should be in _multiSelectedTabsSet"
+        );
+        ok(selectedTabs.includes(tab), "Tab should be in selectedTabs");
+        is(
+          tab.getAttribute("aria-selected"),
+          "true",
+          "Selected tab should be marked as aria-selected"
+        );
+      }
+    }
+  }
+
+  const tab1 = await addTab();
+  const tab2 = await addTab();
+  const tab3 = await addTab();
+
+  testSelectedTabs([tab1]);
+  testSelectedTabs([tab2]);
+  testSelectedTabs([tab2, tab1]);
+  testSelectedTabs([tab1, tab2]);
+  testSelectedTabs([tab3, tab2]);
+  testSelectedTabs([tab3, tab1]);
+  testSelectedTabs([tab1, tab2, tab1]);
+
+  BrowserTestUtils.removeTab(tab1);
+  BrowserTestUtils.removeTab(tab2);
+  BrowserTestUtils.removeTab(tab3);
+});