In main.rs, add a unit test for the cargo_dir function that checks that it panics if we have specified a new crate in the Cargo.toml file but have not yet run any command that would fetch that crate's source to our local filesystem.
Use the existing test marked should_panic for an example of how to make a test check that a function panics.
I doubt that this test will pass currently! Eventually, I'd like this to panic with a message like "Cannot open crate whatever because it is not a dependency of the current project`" or similar.
In
main.rs, add a unit test for thecargo_dirfunction that checks that it panics if we have specified a new crate in theCargo.tomlfile but have not yet run any command that would fetch that crate's source to our local filesystem.Use the existing test marked
should_panicfor an example of how to make a test check that a function panics.I doubt that this test will pass currently! Eventually, I'd like this to panic with a message like "Cannot open crate
whateverbecause it is not a dependency of the current project`" or similar.