[Flutter] using get_it with isolates

I am new to both dart and flutter. Working on a project where I download some resources from a remote server using isolates. All works fine. I wrote some tests already but I also want to add a test case to cover a network problem. In order to to that, I want to mock up Http.Client() instance used in isolate with a mock object. In order to use dependency injection, I have been trying to use get_it. After a couple of hours, it occurred to me that where I register http.Client() code is not shared with the isolate as isolate and the main isolate do not share the same memory.

I am sure I am not the first one dealing with this problem. So what I am asking for is some recommendations from more experienced flutter(/dart) developers about how to approach this testing issue.

All suggestions are highly appreciated. Thank you.

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