Description

Removes the rspec dev-dependency and rewrites the ShouldColorize tests as standard Rust #[test] functions.

This removes lazy_static from the dependency graph, since it was only pulled in transitively through rspec.

note: This does not change MSRV; the crate already declares rust-version = "1.80".

Testing

Ran:

cargo fmt --all

cargo test

Also verified lazy_static is no longer present in the dependency graph:

cargo tree -i lazy_static

This now returns:

error: package ID specification 'lazy_static' did not match any packages