How to Deal With a Cross Chain World in Testing

As people start building more and more complicated applications across chain, you'll basically need to instant have foundry un you know, simulate sort ofthe multiple virtual machines. How do i test that? There's a couple of approaches here. One is that you think of the local chain as the place where you're testing. We call it mocking. It just means, you know, don't run the actual computation. I'll tell you what to return if you receive some kind of inputA so in this world, the multi chain testing thing is not a problem because you just always say, a give me the response that you expect. Now, if you want to properly integration test against both chains

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