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I'm trying to have a deep understanding of the differences between xcm-simulator and xcm-emulator.

I understand that xcm-emulator is "less mocked" than xcm-simulator. But because when using xcm-simulator we also configure chains runtimes is a bit unclear for me. Some project that I have checked it out only use xcm-simulator to test their xcm capabilities, I wonder why is that?

Initially, I assumed the XCM-emulator was better for using a "less mocked" tool, thus allowing for more reliable tests to be built.

I would like to include a test case in my parachain project that checks whether I can transfer a token to another parachain and then return it to my parachain. Which of the two tools is best for this?

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Quick answer, for your use case is better to use XCM Emulator with the relay chain and parachains runtimes.

From the XCM Docs The xcm-emulator is a tool to emulate XCM program execution using pre-configured runtimes, including those used to run on live networks, such as Kusama, Polkadot, Statemine, etc. This allows for testing cross-chain message passing and verifying outcomes, weights, and side-effects.

While the the xcm-simulator is a tool to quickly test the execution of various XCM instructions against the xcm-executor.

If can want to go more in deep with both, I recommend check this video: XCM Simulator & xcm-emulator for parachain integration testing tak

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  • Thanks it makes sense. Although I am finding it very difficult to find projects that use xcm-emulator apart from Polkadot. Do you have any idea why this is the case? Perhaps it's simply because they prefer to use other tools like Chopsticks, which I find curious
    – magecnion
    Commented Jan 2 at 12:14

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