How to define test-only dependencies?
Yes. Use dev-dependencies. From the Cargo docs:
You can add a
[dev-dependencies]section to yourCargo.tomlwhose format is equivalent to[dependencies]:[dev-dependencies] tempdir = "0.3"Dev-dependencies are not used when compiling a package for building, but are used for compiling tests, examples, and benchmarks.
When possible, you should also use Cargo's resolver version 2 to better handle complicated dev-dependency cases.