test: add unit tests for (#54)

- Add unit tests for models and all of background-scripts package
- Made code more testable by relying more on promises
- Fixed bugs found while performing testing.

.gitignore

@@ -4,3 +4,4 @@ node_modules/*
 notepads/*
 extension/*
 .vscode/*
+coverage/*

jest.config.js

@@ -2,4 +2,5 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
-};
+  coveragePathIgnorePatterns: ['/node_modules/', '/mocks/']
+};

package.json

@@ -1,11 +1,11 @@
 {
   "name": "vocab-forager",
-  "version": "2.1.3",
+  "version": "2.1.4",
   "description": "VocabForager is a browser extension built for people building their vocabulary for one, or several, languages.",
   "main": "index.js",
   "scripts": {
     "clean": "rm -rf extension extension.zip",
-    "test": "jest",
+    "test": "jest --coverage --silent --detectOpenHandles",
     "build-dev": "webpack --env mode=development --config webpack/webpack.config.js",
     "build-prod": "webpack --env mode=production --config webpack/webpack.config.js",
     "build-prod-zip": "npm run clean && npm run build-prod && zip -r extension.zip extension"

public/manifest.json

@@ -1,7 +1,7 @@
 {
   "name": "VocabForager",
   "description": "VocabForager is a browser extension built for people build their vocabulary for one, or several, languages.",
-  "version": "2.1.3",
+  "version": "2.1.4",
   "manifest_version": 3,
   "icons": {
     "16": "icons/icon128.png",