Describe the bug

When you

• enabled coverage
• mock Math.random and not restoring the original function after test

vitest hangs up.
If you run the same code with jest, it finishes.

const t = typeof vi !== 'undefined' ? vi : jest

test('Math.random mock', () => {
  // const original = Math.random
  const mocked = t.fn(() => 0.1);
  Math.random = mocked
  // Math.random = original
});

When you restore Math.random it will work. (uncomment line 4 & 7)

I think it does not need to end the test successfully, but at least fail with timeout.
Because it is hard to find which test is hanging up.

Reproduction

https://gist.github.com/sapphi-red/d3454a362c3b66e3654918516c808d7e

1. Download zip and extract
2. npm ci
3. npm run jest runs successfully
4. npm run vitest never ends

(stackblitz did not work)

System Info

System:
    OS: Windows 10 10.0.19044
    CPU: (8) x64 Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
    Memory: 12.61 GB / 31.93 GB
  Binaries:
    Node: 16.14.0 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.17 - C:\Program Files\nodejs\yarn.CMD
    npm: 8.1.3 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 98.0.4758.102
    Edge: Spartan (44.19041.1266.0), Chromium (99.0.1150.30)
    Internet Explorer: 11.0.19041.1202
  npmPackages:
    vitest: ^0.5.9 => 0.5.9

Used Package Manager

npm

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• The provided reproduction is a minimal reproducible example of the bug.