Chore/setup testing environment (#755)

* chore: setup environment for unit tests

* fix: remove extra character from json

.eslintrc

@@ -11,7 +11,7 @@
   "parserOptions": {
     "project": "./app/assets/javascripts/tsconfig.json"
   },
-  "ignorePatterns": [".eslintrc.js", "webpack.*.js", "webpack-defaults.js"],
+  "ignorePatterns": [".eslintrc.js", "webpack.*.js", "webpack-defaults.js", "jest.config.js"],
   "rules": {
     "standard/no-callback-literal": 0, // Disable this as we have too many callbacks relying on literals
     "no-throw-literal": 0,