added testing harness for typescript to project

jest.config.js

@@ -0,0 +1,6 @@
+module.exports = {
+    transform: {'^.+\.ts?$': 'ts-jest'},
+    testEnvironment: 'node',
+    testRegex: '/tests/.*\.(ts|tsx)$',
+    moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node']
+}

package.json

@@ -9,7 +9,7 @@
     "url": "git://github.com/username/repository.git"
   },
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "jest",
     "clean": "gulp clean",
     "build": "gulp",
     "start": "npm run build && electron ./build",
@@ -51,6 +51,9 @@
     "gulp": "^4.0.2",
     "gulp-typescript": "^6.0.0-alpha.1",
     "gulp-exec": "^5.0.0",
-    "del": "^6.0.0"
+    "del": "^6.0.0",
+    "jest": "^26.6.1",
+    "ts-jest": "^26.4.2",
+    "@types/jest": "^26.0.15"
   }
 }