Access a private variable in spec.ts, Angular6

I am using a private variable in Angular-6 service.ts.

private tagSubject = new Subject<any>();


It is been used like

sendNewTagMessage(message: string) {
this.tagSubject.next({ text: message });
}

clearNewTagMessage() {
this.tagSubject.next();
}


I want to write a unit test for tagSubject.

I cant do service.tagSubject.subscribe in the spec.ts as it is giving error like Property 'tagSubject' is private and only accessible within class. What can I do now. Please help.

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