Rust Quality Gates

Before considering any change complete, all of the following must pass:

cargo build               # Successful compilation
cargo test                # All tests pass
cargo clippy -- -D warnings  # Zero warnings
cargo fmt --check         # Formatting compliant

Do not skip or ignore any of these checks.

Clippy Lints (library crates)

Deny unwrap and expect in production code, but allow them in tests:

// At crate root (lib.rs)
#![cfg_attr(not(test), deny(clippy::unwrap_used, clippy::expect_used))]

Using #![deny(...)] without cfg_attr will also reject .unwrap() in #[cfg(test)] modules, causing test compilation failures.

Testing Conventions

• Unit tests: #[cfg(test)] module in the same file as the code under test
• Integration tests: tests/ directory at crate root
• Prefer trait-based fakes over mockall unless complexity justifies it