test: Enable workspaces when doing tests, b=(no-bug), c=tests, workspaces

src/zen/tests/workspaces/browser_basic_workspaces.js

@@ -0,0 +1,13 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_setup(async function () {
+  await ZenWorkspaces.createAndSaveWorkspace('Test Workspace 2');
+});
+
+add_task(async function test_Check_Creation() {
+  const workspaces = await ZenWorkspaces._workspaces();
+  ok(workspaces.workspaces.length, 2);
+});