BUG: Spawned Process does Not Reflect Parent `process.env`

[jpulec]

Describe your issue:
There's an issue with jest where it does not properly pass along the process.env value when calling spawn. This is because jest sandboxes and isolates a copy of process.env which means that any changes to process.env made inside of a test setup script, for example, will not be reflected in subprocess environment. One simple way to resolve this is to just explicitly pass process.env to the spawn call.

Relevant Jest issue here.

The code of the library usage:

import { prepareEnvironment } from '@gmrchk/cli-testing-library';

process.env.COOL_ENV_VAR = 'foo';

it('program', async () => {
    const { cleanup, exec path } = await prepareEnvironment();
    
    const { stdout } = await exec('printenv'); 
    
    console.log(stdout); // COOL_ENV_VAR is not there

    await cleanup();
});

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• Have you checked closed issues for similar/related problems?
• Have you provided all helpful information available?
• Have you considered creating a demo repository, or a link to your running project where the problem is reproducible?