Added jest testing framework

.eslintrc.json

@@ -5,7 +5,10 @@
         "es2021": true,
         "node": true
     },
-    "extends": "eslint:recommended",
+    "extends": [
+        "eslint:recommended",
+        "plugin:jest/recommended"
+    ],
     "parserOptions": {
         "ecmaVersion": "latest"
     },

.gitignore

@@ -1,5 +1,7 @@
 static/assets/diagrams/
 
+coverage/
+
 node_modules/
 
 config/*.json

jest.config.js

@@ -0,0 +1,11 @@
+/*
+ * For a detailed explanation regarding each configuration property, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+module.exports = {
+	clearMocks: true,
+	collectCoverage: true,
+	coverageDirectory: 'coverage',
+	coverageProvider: 'v8'
+};

package.json

@@ -4,7 +4,7 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -21,6 +21,8 @@
     "mysql2": "^2.3.3"
   },
   "devDependencies": {
-    "eslint": "^8.6.0"
+    "eslint": "^8.6.0",
+    "eslint-plugin-jest": "^25.7.0",
+    "jest": "^27.4.7"
   }
 }