# Lightningd Utility to run a regtest lightningd process, useful in integration testing environment. ```rust let bitcoind_exe = bitcoind::exe_path().expect("bitcoind version feature must be enabled or BITCOIND_EXE env var must be present"); let bitcoind = bitcoind::BitcoinD::new(bitcoind_exe).unwrap(); let lightningd_exe = env::var("LIGHTNINGD_EXE").expect("lightningd path must be specified in LIGHTNINGD_EXE env var"); let lightningd = lightningd::LightningD::new(lightningd_exe, bitcoind).unwrap(); ``` # Test Run test example: ```bash RUST_LOG=debug LIGHTNINGD_EXE=/usr/local/bin/lightningd cargo test --features bitcoind_22_0 -- --nocapture ```