Multi Test: Test helpers for multi-contract interactions

Warning: Alpha Software Designed for internal use only.

This is used for testing cosmwasm-plus contracts, we have no API stability currently. We are working on refactoring it and will expose a more refined version for use in other contracts. (Ideally in cosmwasm-plus 0.9 or 0.10).

Use at your own risk

Let us run unit tests with contracts calling contracts, and calling in and out of bank.

This only works with contracts and bank currently. We are working on refactoring to make it more extensible for more handlers, including custom messages/queries as well as IBC.