Do not copy tests into .cache directory

[LegNeato]

It appears gatsby caches its tests:

$ ls -1 .cache/__tests__/
__snapshots__
find-page.js
loader.js
prefetcher.js

I am using yarn's workspace support and jest. Jest by default tries to run the tests in the cache and fails with a bunch of errors like:

Loader › It stops downloading when the resourcesArray is empty

    TypeError: Cannot read property 'empty' of undefined
      
      at Object.<anonymous> (my_site/.cache/__tests__/prefetcher.js:11:15)
          at Promise (<anonymous>)
          at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:169:7)

In order to get my tests to pass I had to add the cache directory to jests's ignores in package.json:

    "testPathIgnorePatterns": ["/node_modules/", "/\\.cache/"],

[KyleAMathews]

Oh hmmm... that is bad. Could you put together a PR fixing the copying here?

gatsby/packages/gatsby/src/bootstrap/index.js

Line 153 in f05d736

await fs.copy(srcDir, siteDir, { clobber: true })

[LegNeato]

Hmmm, could possibly be due to my setup? I get the same error running yarn test in gatby's repo too.

I wonder if it is the same as #2244

[KyleAMathews]

Closing this issue as it's fairly old and we have far too many open issues! If you have additional problems in this area, please open a new issue!