fix: Allow searching for tests in node_modules

[cjr125]

Summary

In order to be able to inherit a common Jest test from an npm module, the user needs to be able to search for tests in the node_modules directory. The boolean "retainAllFiles" had been hard-coded to false, preventing this inheritance from being possible. The changes here expose the variable via the "haste" configuration property and allow the user to optionally scan the node_modules for test patterns.

Test plan

$ npx jest --testRegex "/*(.pact.test.js)" --runInBand
 PASS  test/src/Health.pact.test.js (9.646 s)
 PASS  node_modules/@aw/node-testing/dist/test/health.pact.test.js (5.922 s)

Test Suites: 2 passed, 2 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        15.733 s
Ran all test suites.

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[SimenB]

@cjr125 Hi, sorry I missed this PR!

Could you rebase it (or just merge in main if you prefer) and add an integration test actually running a test in node_modules? You can add a "fake" node_modules and just git add --force it

[SimenB]

Thanks! Test is failing on CI, in case you missed it 🙂

[SimenB]

thanks!

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