process::ExitStatus should have some kind of constructor

[nrc]

Because ExitStatus has a private field it is impossible to create one in user code, one must actually execute a process. This prevents testing/mocking. My use case is that I have some function which runs a process and generates data, however, for testing I want to mock the test run and just return a success exit status and some data. I can't do that because I can't create my own ExitStatus objects.

At the least there should be a way to create a success ExitStatus. Preferably, there would be a way to create various fail statuses too.

[frewsxcv]

Should the constructor just take an i32?

[alexcrichton]

I've also wanted a basically "raw constructor" in the past. I'd be fine adding some std::os extensions which allow construction from a c_int or DWORD (i32 and u32)

[jirutka]

+1
I’d like to extend Command, but I cannot reuse Output for return value because I can’t construct ExitStatus. :(

[alexcrichton]

I've opened a PR for this over at #33224

[jirutka]

Great, thanks! 👍