Prepare for adding theseus

apps/theseus-gui-tpl/src/app/App.spec.ts

@@ -0,0 +1,14 @@
+import router from '../router';
+
+import { mount } from '@vue/test-utils';
+import App from './App.vue';
+
+describe('App', () => {
+  it('renders properly', async () => {
+    const wrapper = mount(App, { global: { plugins: [router] } });
+
+    await router.isReady();
+
+    expect(wrapper.text()).toContain('Welcome theseus-gui 👋');
+  });
+});