test/ dir is in `include`, non-spec TS files (e.g. test utils) break build with v0.13 rootDir: `./src`

Current Behavior

Prior to v0.13 #504 , I could put a file into my test folder that contained utility code for tests and it would get compiled without a problem.

test/TestUtils.tsx

Now, when I tsdx build, I see this error:

rpt2: options error TS6059: File '/mui-rff/test/TestUtils.tsx' is not under 'rootDir' '/mui-rff/src'. 'rootDir' is expected to contain all source files.

Expected behavior

I have a place to put utility code for tests.

Suggested solution(s)

No idea, but you have a list of 3rd parties using this project and it would be nice if you would start to test future versions of tsdx against these projects to see if you break peoples stuff and can then use that to find out how to tell people how to fix their broken stuff.

Your environment

Software	Version(s)
TSDX	v0.13
TypeScript	3.8.3
npm/Yarn	6.13.7 / 1.22.4
Node	v13.11.0
Operating System	OSX Catalina

[lookfirst]

For the record, I wasn’t poking at TSDX, I was poking at users of TSDX. 😉

[lookfirst]

I do notice that the build is faster now. =)