Add testUrl to avoid jsdom SecurityError

Without testUrl
"SecurityError: localStorage is not available for opaque origins"
errors happens with latest jsdom.
Refer jsdom/jsdom#2304 to more detail information.

Also shallow deprecation has been resolved.

package.json

@@ -37,6 +37,7 @@
     "vue-template-compiler": "^2.5.13"
   },
   "jest": {
+    "testURL": "http://localhost/",
     "moduleFileExtensions": [
       "js",
       "vue"

test/PictureInput.spec.js

@@ -1,12 +1,12 @@
-import { shallow } from '@vue/test-utils'
+import { shallowMount } from '@vue/test-utils'
 import { createRenderer } from 'vue-server-renderer'
 
 import PictureInput from '../PictureInput.vue'
 
 describe('PictureInput.vue', () => {
   it('matches snapshot', () => {
     const renderer = createRenderer()
-    const wrapper = shallow(PictureInput)
+    const wrapper = shallowMount(PictureInput)
     renderer.renderToString(wrapper.vm, (err, str) => {
       if (err) throw new Error(err)
       expect(str).toMatchSnapshot()