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 the following statement in your typescript code.
declare const javaScriptVariable: string;
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"
]
} 
