Just to add to the existing answer and if like me you found this question because you are wondering what the difference is between TestBed.get() and TestBed.inject() which I know was not quite what the OP originally asked but it is relevant and is very much related.
I thought it was worth posting that according to the latest Angular documentation that TestBed.inject() is the type safe replacement of TestBed.get().
From the Angular documentation on TestBed that can be found here.
