Allow CommandCargoExt to pass build arguments

[quininer]

Sometimes we want to provide testing for different features bin.

[epage]

Sorry I haven't responded earlier.

Is the primary concern features?

Some of the challenges

• Right now, we directly return a Command. Adding more to this API makes it so we can't. How should we bridge that gap?
• What is in scope and what isn't?
• The API for the main_binary_paths

[epage]

I've started mapping out what we might due to the API to help

Please check out #44 and provide feedback

[epage]

The recommendation is to call into escargot directly. You can find an example within assert_cmd: https://github.com/assert-rs/assert_cmd/blob/master/src/cargo.rs#L137