Fork of runtime-macros
with custom derive support
This crate offers a way to emulate the process of procedural macro expansion at run time.
It is intended for use with code coverage tools like tarpaulin, which can't measure
the code coverage of anything that happens at compile time.
Currently it supports functionlike attributes and custom derives. It does not support custom attributes as macros, though custom helper attributes on custom derives work.
To use it, add a test case to your procedural macro crate that calls emulate_macro_expansion
on a .rs file that calls the macro. Most likely, all the files you'll want to use it on will
be in your /tests directory. Once you've completed this step, any code coverage tool that
works with your crate's test cases will be able to report on how thoroughly you've tested the
macro.
See the /examples directory in the repository for working examples. Note that the
custom_assert example requires nightly at present.
To run tests, run cargo test -- --test-threads 1 - Tarpaulin is not capable of running
multiple instances at once