Finally got testing working!

.idea/ed-safari.iml

@@ -8,5 +8,6 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="@types/mocha" level="application" />
   </component>
 </module>

.idea/jsLibraryMappings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <file url="file://$PROJECT_DIR$/test" libraries="{@types/mocha}" />
+    <excludedPredefinedLibrary name="HTML" />
+  </component>
+</project>

babel.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+    presets: [
+        ['@babel/preset-env', {targets: {node: 'current'}}],
+        '@babel/preset-typescript',
+    ],
+};

jest.config.js

@@ -0,0 +1,10 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+    testEnvironment: 'node',
+    "transformIgnorePatterns": [
+        "/node_modules/(?!lodash-es/.*)"
+    ],
+    transform: {
+        '\\.[tj]sx?$': ['babel-jest', { rootMode: 'upward' }],
+    }
+};

package.json

@@ -9,7 +9,8 @@
     "package": "electron-forge package",
     "make": "electron-forge make",
     "publish": "electron-forge publish",
-    "lint": "echo \"No linting configured\""
+    "lint": "echo \"No linting configured\"",
+    "test": "jest"
   },
   "keywords": [],
   "author": {
@@ -22,6 +23,9 @@
     "node 18"
   ],
   "devDependencies": {
+    "@babel/core": "^7.21.8",
+    "@babel/preset-env": "^7.21.5",
+    "@babel/preset-typescript": "^7.21.5",
     "@electron-forge/cli": "^6.1.1",
     "@electron-forge/maker-deb": "^6.1.1",
     "@electron-forge/maker-rpm": "^6.1.1",
@@ -30,12 +34,15 @@
     "@electron-forge/plugin-vite": "^6.1.1",
     "@tsconfig/node-lts": "^18.12.2",
     "@tsconfig/node20": "^1.0.0",
+    "@types/jest": "^29.5.1",
     "@types/lodash-es": "^4.17.7",
     "@types/node": "^20.1.2",
     "@types/tail": "^2.2.1",
     "autoprefixer": "^10.4.14",
+    "babel-jest": "^29.5.0",
     "browserslist": "^4.21.5",
     "electron": "24.2.0",
+    "jest": "^29.5.0",
     "sass": "^1.62.1",
     "typescript": "^5.0.4"
   },

src/models/Safari.ts

@@ -10,8 +10,9 @@ import { Log } from "./Log";
 
 export class Safari {
   static #instance: Safari;
-    #journalDir?: string;
-    #journalPattern?: string;
+
+  readonly #journalDir?: string;
+  readonly #journalPattern?: string;
   journal?: Journal;
 
   #watcher?: any;
@@ -66,6 +67,7 @@ export class Safari {
 
   // https://stackoverflow.com/questions/15696218/get-the-most-recent-file-in-a-directory-node-js
   #getLatestJournal(): Journal|undefined {
+    // @ts-ignore
     const journals = globSync(this.#journalPattern, {windowsPathsNoEscape: true});
     const journalPath: string|undefined = _.maxBy(journals, file => fs.statSync(file).mtime);
 
@@ -82,6 +84,7 @@ export class Safari {
 
   watchJournalDir(): void {
     const options = {usePolling: true, persistent: true, ignoreInitial: true};
+    // @ts-ignore
     this.#watcher = chokidar.watch(this.#journalPattern, options);
 
     this.#watcher.on('ready', () => Log.write('Watching journal folder for changes...'));

test/Safari.test.ts

@@ -0,0 +1,8 @@
+import {Safari} from '../src/models/Safari';
+
+describe('Safari', function () {
+  it('should return itself', () => {
+    const safari = Safari.start(false);
+    expect(safari).toBeDefined();
+  });
+});

tsconfig.json

@@ -5,5 +5,5 @@
         "lib": ["DOM"]
     },
     "include": ["src"],
-    "exclude": ["node_modules"]
+    "exclude": ["node_modules"],
 }