fix: unable to resolve path to mapped file with custom platform #7312
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Summary
Fixes a bug where Jest was unable to resolve a path to a file mapped with
moduleNameMapper
and having custom platforms set.This is done by applying logic from
resolveModuleFromDirIfExists
to_resolveStubModuleName
:https://github.com/facebook/jest/blob/bb9efac6c0e5fa3e487d80a639658c29044e081c/packages/jest-resolve/src/index.js#L115-L134
Test plan
Added a test that fails before applying to this fix.