Add proper tests, exception handling, implement getAbstractName

src/runtime/javascript/package.json

@@ -5,7 +5,7 @@
   "main": "dist/index.js",
   "scripts": {
     "build": "npx tsc",
-    "test": "ts-node ./tests/basic.ts"
+    "test": "npx jest"
   },
   "author": "John J. Camilleri",
   "license": "ISC",
@@ -14,7 +14,9 @@
   },
   "devDependencies": {
     "@types/ffi": "^0.2.3",
-    "ts-node": "^10.2.1",
+    "@types/jest": "^27.0.2",
+    "jest": "^27.2.4",
+    "ts-jest": "^27.0.5",
     "typescript": "^4.4.3"
   }
 }