try-runtime-cli docs and tests

[liamaharon]

At least one try-runtime-cli command passes parameters in the incorrect order (https://substrate.stackexchange.com/q/7902/3991).

Need to audit all the examples in the docs and fix any issues, and write some CLI tests to make sure they don't break in the future.

We should also write some CLI tests. See subtrate CLI and I believe this repo is using similar testing patterns https://github.com/paritytech/staking-miner-v2/tree/main/tests for an examples on how to write the tests.

Docs

• Audit doc examples (Improve try-state docs #13967 credit @Szegoo)

Tests

• follow-chain Fix try-runtime follow-chain, try-runtime upgrade tuple tests, cli test utils #13794
• on-runtime-upgrade
• offchain-worker
• execute-block try-runtime-cli: execute-block & create-snapshot tests #14343
• create-snapshot try-runtime-cli: execute-block & create-snapshot tests #14343

[ggwpez]

There are more example node tests here, just as an idea of how to do it in Substrate https://github.com/paritytech/substrate/blob/8a9f48bcf0c9f92949082535d77c12166522bb2f/bin/node/cli/tests/

[liamaharon]

There are more example node tests here, just as an idea of how to do it in Substrate https://github.com/paritytech/substrate/blob/8a9f48bcf0c9f92949082535d77c12166522bb2f/bin/node/cli/tests/

Thanks!

[Szegoo]

@liamaharon Just to let you know I am looking to rewrite the example part of the try-runtime-cli docs, specifically the try-state section. I believe that some of the examples and explanations could be better. I will also try my best to fix all of the issues.