tests: add some issing tests

tests/unit/App.spec.js

@@ -0,0 +1,12 @@
+import Vue from 'vue'
+import { shallowMount, mount } from '@vue/test-utils'
+import BootstrapVue from 'bootstrap-vue'
+import App from '@/App'
+
+Vue.use(BootstrapVue)
+
+describe('App.vue', () => {
+  it('has a name', () => {
+    expect(App.name).toMatch('app')
+  })
+})