fix: add aria-activedescendant only when there is one (#1137)

tests/unit/Accessibility.spec.js

@@ -0,0 +1,35 @@
+import { mountDefault } from "../helpers";
+
+describe("Search Slot Scope", () => {
+  /**
+   * @see https://www.w3.org/WAI/PF/aria/states_and_properties#aria-activedescendant
+   */
+  describe("aria-activedescendant", () => {
+    it("adds the active descendant attribute only when the dropdown is open and there is a typeAheadPointer value", async () => {
+      const Select = mountDefault();
+
+      expect(
+        Select.vm.scope.search.attributes["aria-activedescendant"]
+      ).toEqual(undefined);
+
+      Select.vm.open = true;
+      await Select.vm.$nextTick();
+
+      expect(
+        Select.vm.scope.search.attributes["aria-activedescendant"]
+      ).toEqual(undefined);
+    });
+
+    it("adds the active descendant attribute when there's a typeahead value and an open dropdown", async () => {
+      const Select = mountDefault();
+
+      Select.vm.open = true;
+      Select.vm.typeAheadPointer = 1;
+      await Select.vm.$nextTick();
+
+      expect(
+        Select.vm.scope.search.attributes["aria-activedescendant"]
+      ).toEqual(`vs${Select.vm.uid}__option-1`);
+    });
+  });
+});