Resolves and rejects matchers don't have source files in stack traces

[nickserv]

Do you want to request a feature or report a bug?
Either a bug or a missing feature for resolves and rejects.

What is the current behavior?
When resolves or rejects are used, stack traces only include stack frames internal to expect, Jest, and Node, not the source files that caused the error.

If the current behavior is a bug, please provide the steps to reproduce and either a repl.it demo through https://repl.it/languages/jest or a minimal repository on GitHub that we can yarn install and yarn test.
Use the expect(...).resolves or .rejects syntax, either returning the expression or using an async function with await before expect. This issue can be avoided by using async functions without resolves/rejects, which I'm currently using as a workaround.

Unhelpful stack trace with resolves/rejects:

test('script with fixed version', async () => {
  const url = `https://unpkg.com/${name}@${version}/index.js`
  await expect(cdnm.updateDependency(createScript(url))).resolves.toEqual(createScript(replaceVersion(url)))
})

Helpful stack trace without resolves/rejects:

test('script with fixed version', async () => {
  const url = `https://unpkg.com/${name}@${version}/index.js`
  expect(await cdnm.updateDependency(createScript(url))).toEqual(createScript(replaceVersion(url)))
})

What is the expected behavior?
Stack frames should ideally include my source files because the error originates from my source files (it's not internal to Jest). This happens if I avoid resolves and rejects by using async functions or testing code that doesn't use Promises at all.

Please provide your exact Jest configuration and mention your Jest, node, yarn/npm version and operating system.

• Jest 21.2.1
• Node 8.6.0
• npm 5.4.2
• macOS 10.13

[thymikee]

Tested on Node 8.7.0, same Jest version and stack trace shows the test file like usual. Can you reproduce this on other Node versions?

[thymikee]

Ok, actually was able to reproduce it:

test('async reject no stack', async () => {
  await expect(Promise.resolve('test')).resolves.toEqual('tost');
});

produces:

at Object.<anonymous> (../jest/node_modules/expect/build/index.js:139:54)
          at Generator.next (<anonymous>)
          at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)

[SimenB]

I'll merge this into #5104.

[github-actions]

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