Rewire messes up line number reporting in Jest

[lorenzos]

When I use rewire() in my Jest test files, JEST CLI starts reporting wrong lines when highlighting errors and failed test. I don't know if it's a Rewire or Jest issue, however everything works correctly when not calling rewire() and using normal require() instead.

Here's all you need to reproduce:

npm install jest rewire # Jest 24.8.0, Rewire 4.0.1 
node --version # v10.15.3
npm init # Set "jest" as test command

// main.js
const sum = (a, b) => a + b;
module.exports = { sum };

// main.test.js
const rewire = require('rewire');
const main = rewire('./main.js');
test('sum', () => {
	const sum = main.__get__('sum');
	expect(sum(1, 2)).toBe(4); // Fail
	expect(sum(1, 2)).toBe(3); // Pass
	expect(sum(1, 1)).toBe(2); // Pass
});

Now, if you run npm test, the test correctly runs and fails on the first expect(), but the third one is highlighted. Here's the output of Jest, note how expected and received values are correct, but highlighted is wrong:

    Expected: 4
    Received: 3

       6 | 	expect(sum(1, 2)).toBe(4); // Fail
       7 | 	expect(sum(1, 2)).toBe(3); // Pass
    >  8 | 	expect(sum(1, 1)).toBe(2); // Pass
         | 	                   ^
       9 | });

Funnilly enough, if you don't use Rewire's __get__ to get the test function, but simply use main.sum instead, Jest highlights a different wrong line, the second expect():

    Expected: 4
    Received: 3

       5 | 	const sum = main.sum;
       6 | 	expect(sum(1, 2)).toBe(4); // Fail
    >  7 | 	expect(sum(1, 2)).toBe(3); // Pass
         | 	                   ^
       8 | 	expect(sum(1, 1)).toBe(2); // Pass
       9 | });

Lastly, if you don't use Rewire altogether, including the main module with require('./main.js') and commenting out require('rewire'), everything is correct:

    Expected: 4
    Received: 3

      4 | test('sum', () => {
      5 | 	const sum = main.sum;
    > 6 | 	expect(sum(1, 2)).toBe(4); // Fail
        | 	                  ^
      7 | 	expect(sum(1, 2)).toBe(3); // Pass
      8 | 	expect(sum(1, 1)).toBe(2); // Pass
      9 | });

Thanks.