Jasmine is a Behavior Driven Development testing framework for JavaScript. It does not rely on browsers, DOM, or any JavaScript framework. Thus it’s suited for websites, Node.js projects, or anywhere that JavaScript can run.
How to reproduce it
Use a JavaScript library in the project and run a test.
npx ng test
Error
ReferenceError: <javaScriptVariable> is not defined
at new AppComponent (http://localhost:9876/_karma_webpack_/webpack:/src/app/app.component.ts:15:5)
at NodeInjectorFactory.factory (ng:///AppComponent/ɵfac.js:4:10)
at getNodeInjectable (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2020/core.mjs:3485:44)
at createRootComponent (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2020/core.mjs:12391:35)
at ComponentFactory.create (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2020/core.mjs:12272:25)
at apply (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2020/testing.mjs:24361:51)
at _ZoneDelegate.invoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:375:26)
at ProxyZoneSpec.onInvoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone-testing.js:287:39)
at _ZoneDelegate.invoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/zone.js/fesm2015/zone.js:374:52)
at Object.onInvoke (http://localhost:9876/_karma_webpack_/webpack:/node_modules/@angular/core/fesm2020/core.mjs:24313:33)
Solution
Update angular.json file – add “scripts” : [] to the “tests” object
"test": {
"scripts": [
"src/assets/js/script.js"
]
} 
