Failed test doesn't show diff when using assert.equal on an async test function

[sanfilippopablo]

🐛 Bug Report

When the test function returns a promise and you use assert to make the assertion, the output doesn't show the diff.

To Reproduce

Use assert in an async test function:

test('it shows diff async', async () => {
  assert.equal('hello\ngoodbye', 'hello', 'hmmm')
})

Expected behavior

It should show the diff between the expected and actual values.

Link to repl or repo (highly encouraged)

Repo reproducing bug: https://github.com/sanfilippopablo/jest-no-diff-output

Run npx envinfo --preset jest

Paste the results here:

  System:
    OS: macOS High Sierra 10.13.6
    CPU: x64 Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
  Binaries:
    Node: 9.8.0 - /usr/local/bin/node
    Yarn: 1.3.2 - /usr/local/bin/yarn
    npm: 5.6.0 - /usr/local/bin/npm
  npmPackages:
    jest: ^23.4.1 => 23.4.1

[Diokuz]

I think I have the same problem. I use async expecters, and they never shows the diff.

[SimenB]

PR: #6821

[github-actions]

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