Generator of Tendermint types for unit, integration, and model-based testing

[andrey-kuprianov]

Here we introduce both the code-level helpers for generating tendermint object hierarchies in tests, as well as the command-line generator of those hierarchies.

For the high-level explanation please see #393.

This is still a WIP, but as it is already usable it probably makes sense to merge now, and then extend in separate PRs/issues.

Will be grateful for your reviews!

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Updated CHANGES.md

[romac]

Just want to emphasize how good the CLI interface is by the way:

    tendermint-testgen validator --id a --voting-power 3
     echo -n '{"id": "a", "voting_power": 3}' | tendermint-testgen --stdin validator
     echo -n a | tendermint-testgen --stdin validator --voting-power 3
     echo -n '{"id": "a"}' | tendermint-testgen --stdin validator --voting-power 3
     echo -n '{"id": "a", "voting_power": 100}' | tendermint-testgen --stdin validator --voting-power 3

😍

[romac]

Few more comments on things I missed in my first pass.

[andrey-kuprianov]

Just want to emphasize how good the CLI interface is by the way:

@romac cool, thanks; glad you like it :) What I particularly like about gumdrop is that it's so transparent that I can reuse the same structs for the Rust API and for the CLI...

[andrey-kuprianov]

@shonfeder @romac @brapse I think I've addressed all the issues raised in your reviews; thank you, that was very helpful, and allowed to improve the code a lot:)

[brapse]

👍

[andrey-kuprianov]

@brapse @romac I think I've addressed all the issues raised. For some reason Github says there are still pending changes suggested by @romac, but I don't see anything left, and don't know how to resolve this...

If everything is OK from your side, could you please merge the PR?

[andrey-kuprianov]

Btw, the failing cargo fmt has nothing to do with this PR...