Fixes jest (#1257)

jest.config.js

@@ -1,5 +1,6 @@
 module.exports = {
   clearMocks: true,
+  testEnvironment: "jsdom",
   moduleFileExtensions: ["js", "json", "vue"],
   coveragePathIgnorePatterns: ["node_modules"],
   testPathIgnorePatterns: ["node_modules", "<rootDir>/integration/"],

package.json

@@ -58,7 +58,7 @@
   "eventsourcemock": "^2.0.0",
   "html-webpack-plugin": "^5.3.1",
   "husky": "^6.0.0",
-  "jest": "^26.6.3",
+  "jest": "^27.0.1",
   "jest-serializer-vue": "^2.0.2",
   "lint-staged": "^11.0.0",
   "mini-css-extract-plugin": "^1.6.0",