[BUG] Debugger does not stop inside JEST tests

[rexyeung]

Current Behaviour:
When JEST tests are ran in debugger mode and breakpoints are inserted in the tests, it does not stop at the breakpoints.

Preconditions:

1. Utilizing the sum.js and sum-test.js example on Jest home page

Steps to Reproduce:

1. npm install --save-dev jest
2. npm run test

• inside package.json "node --debug-brk --inspect ./node_modules/.bin/jest -i"

Environment:
Tested on node: 6.3, 6.7, 6.9
JEST: 16.0.1
OS: Mac, Ubuntu 16

Expected Behaviour:
When the test is ran in debugger mode, it should stop at "debugger;"

[maximderbin]

@rexyeung duplicate of #1652

[github-actions]

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