We are using the cw-orchestrator (see here and here). The cw-orchestrator requires an interface to be created for each smart contract that we want to test. Interfaces for Hydro smart contracts are located in packages/interface directory. For more details on how to write a cw-orchestrator smart contract interface see here.
The cw-orchestrator also requires our smart contracts compiled as .wasm files to be present in the artifacts directory. To build the smart contracts for wasm platform use make compile-rust-optimizer command.
Once we have our contracts interfaces ready and .wasm files compiled, we can use them to write end-to-end tests. Tests are placed in test/e2e directory.
We also write end-to-end tests using Interchain Test. These are placed in the test/interchain directory, see hydro_test.go.