need a way to run tests on dependencies

[metajack]

Currently cargo test only runs tests for the top level package. I need some way to run tests for some of the dependencies. In servo these would be at least the path dependencies (which we have to work around lack of multiple [lib] sections). But it would also be nice to run them for arbitrary dependencies.

[alexcrichton]

cc #482, one possible strategy

[brendanzab]

This also affects gfx-rs. Currently we have a Makefile that cds into the subdirectories, but that causes a huge amount of redundant recompilations of dependencies.

[brendanzab]

Could we have the ability to have something like:

cargo [build | test | bench | doc] [PATH...]

Then cargo would run the specified command using the Cargo.toml located under each PATH, but using a common target directory.

@alexcrichton What do you think about supporting running tests recursively, that is, for the package specified and all its dependencies? Say, cargo test --recursive? Should I open a separate issue if that sounds sensible?

[alexcrichton]

Hm, perhaps we could start of with accepting multiple -p flags? It's hard to say where --recursive should stop as you probably don't want to run tests on your entire dependency graph.

[jsgf]

I do!

[fschutt]

@alexcrichton well, I'd be for a --recursive function. I mean, if you don't want to test the entire dependency graph, you don't need to call it. It would be handy for larger releases, where you want to make sure nothing goes wrong.