Call a service function from browser console in angular 6

I have just made a few changes to some methods in one of the services, and wanted to see if the changes had worked properly or not, but instead of creating a class and testing them out manually, I wanted to know if there was a way to call the functions in chrome's console.

I had followed this example for implementing a logger service, and added to my already created jwt service below.

Unfortunately I don't have any implementation of the error in the application so I can't really test it directly. I wanted to check if both conditions are working properly. I checked this answer out but when I try it for myself it gives me a null error (maybe because this expects a component and I want to test a service perhaps).

To give an example, here is my class, and a method as an example which I want to test in the console:

Jwt.service.ts

import { Injectable } from '@angular/core';
import { TranslatePipe } from 'src/app/pipes/translate/translate.pipe';
import { LoggerService } from "src/app/services/logger/logger.service";
/**
* Injects the JSON web token service in the project
*/
@Injectable({
providedIn: 'root'
})

/**
* This service is responsible for management of the jwt token, which would be used
* for authentication/authorization purposes. The service includes methods to save, delete
* and retrieve the token
*/
export class JwtService {


constructor(
private translate: TranslatePipe,
private logger: LoggerService) { }

/**
* This method fetches the token from local storage and returns it.
*
* @method getToken
* @return
*/
getToken(): string {
var token = window.localStorage['jwtToken'];
if (token !== undefined) {
return token;
} else {
this.logger.invokeConsoleMethod('error', this.translate.transform("generic[responses][error][token][001]"));
throw new Error(this.translate.transform("generic[responses][error][token][001]"));
}
}

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