jest-symlink-repro

To reproduce:

1. npm install.
2. Run node index.js. You should see

$ node index.js
a was required
done

3. Run npm test. You should see

$ npm test

> @ test /private/tmp/test-project
> jest

 FAIL  ./index.test.js
  ● Test suite failed to run

    Your test suite must contain at least one test.

      at onResult (node_modules/jest/node_modules/jest-cli/build/TestRunner.js:110:20)
          at <anonymous>

Test Suites: 1 failed, 1 total
Tests:       0 total
Snapshots:   0 total
Time:        0.964s
Ran all test suites.
  console.log a.js:1
    a was required

  console.log b.js:1
    a was required

  console.log index.test.js:3
    done

Notice that a was required was printed twice above.