Update unit-testing-vue-components.md (#1934)

Author: Alex-Sokolov

src/v2/cookbook/unit-testing-vue-components.md

@@ -45,8 +45,9 @@ export default {
 
 ```js
 import { shallowMount } from '@vue/test-utils'
+import Hello from './Hello.vue'
 
-test('Foo', () => {
+test('Hello', () => {
   // render the component
   const wrapper = shallowMount(Hello)
 
@@ -144,6 +145,7 @@ And our first attempt at test:
 
 ```js
 import { shallowMount } from '@vue/test-utils'
+import Foo from './Foo.vue'
 
 describe('Foo', () => {
   it('renders a message and responds correctly to user input', () => {