test: restore and fix unit tests

tests/unit/views/users/User.spec.js

@@ -0,0 +1,46 @@
+import { shallowMount, mount, createLocalVue } from '@vue/test-utils'
+import VueRouter from 'vue-router'
+import CoreuiVue from '@coreui/vue'
+import User from '@/views/users/User'
+
+const localVue = createLocalVue()
+localVue.use(VueRouter)
+const router = new VueRouter()
+
+localVue.use(CoreuiVue)
+
+describe('User.vue', () => {
+  it('has a name', () => {
+    expect(User.name).toMatch('User')
+  })
+  it('is Vue instance', () => {
+    const wrapper = shallowMount(User, {
+      localVue,
+      router
+    })
+    expect(wrapper.isVueInstance()).toBe(true)
+  })
+  it('is User', () => {
+    const wrapper = shallowMount(User, {
+      localVue,
+      router
+    })
+    expect(wrapper.is(User)).toBe(true)
+  })
+  it('should have methods', () => {
+    const wrapper = shallowMount(User,{
+      localVue,
+      router
+    })
+
+    expect(typeof User.methods.goBack ).toEqual('function')
+    expect(wrapper.vm.goBack()).toBeUndefined()
+  })
+  test('renders correctly', () => {
+    const wrapper = shallowMount(User, {
+      localVue,
+        router
+    })
+    expect(wrapper.element).toMatchSnapshot()
+  })
+})