ccusage Testing

The tdd skill owns the Red-Green-Refactor loop and the focused runner commands.
This skill owns what is specific to ccusage: fixtures, adapter coverage, pricing and
model behavior, snapshots, CLI output, and package tooling.

• Prefer behavior-focused tests over schema-shape tests, unless schema normalization
  itself is the behavior under test.
• Branching behavior belongs in separate tests or table-driven cases rather than an
  if inside a test body.
• Skipped local-data smoke tests are acceptable when real user log directories catch
  schema drift, as long as they pass on clean CI machines.

Rust

Unit tests sit next to the module they exercise in #[cfg(test)] mod tests. When a
large module is split, its tests move with the code instead of staying in main.rs.

Read references/rust.md for fixtures, snapshots, pricing, and model names.

Node

Read references/node-test.md. Node covers only the package launcher and the Nix-side
JS tooling; production CLI runtime behavior is tested in Rust.