It is a good starting point for checking an existing Wasm file on NEAR Protocol.

Install Rust and Cargo: https://www.rust-lang.org/tools/install

1. Put the Wasm file you want to test into the root of this project and name it contract.wasm
2. Run cargo test

If you want to test the contract with the latest version of NEAR Protocol, you can build the NEAR Protocol from the source code.

1. Clone nearcore from debug/wasm-logs branch: https://github.com/near/nearcore/compare/debug/wasm-logs
2. make neard-debug
3. Set the NEAR_SANDBOX_BIN_PATH env variable to a full path pointing to the neard in ./target/debug folder
4. Set the NEAR_ENABLE_SANDBOX_LOG=1
5. and run cargo test

Example one-liner:

env NEAR_SANDBOX_BIN_PATH=/home/frol/nearcore/target/debug/neard NEAR_ENABLE_SANDBOX_LOG=1 cargo test