Version 29.70 Steps to reproduce <p dir="a

I just hit this too, but my output is: <div class="highlight highlight-text-shell-

[Bug]: DataCloneError: Symbol(jest.asymmetricMatcher) could not be cloned using `--workerThreads`. about jest HOT 3 OPEN

VictorGlindasPaf commented on July 1, 2024

[Bug]: DataCloneError: Symbol(jest.asymmetricMatcher) could not be cloned using `--workerThreads`.

from jest.

Comments (3)

SimenB commented on July 1, 2024

https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Structured_clone_algorithm#javascript_types

Primitive types, except symbol.

Great... 😅 Not sure how we can deal with this properly 🤔

from jest.

VictorGlindasPaf commented on July 1, 2024

To expand on this, it doesn't only seem to be an issue with jest symbols, but with anything that throws and can't be structurally cloned.

For example if I run a test that calls axios and the test throws an AxiosError, I get the same vague DataCloneError.

Another side note; I don't seem to get this error with .toMatchObject, since the error that throws doesn't contain the symbols that .toEqual does.

from jest.

ldeveber commented on July 1, 2024

I just hit this too, but my output is:

  ● Test suite failed to run

    DataCloneError: function () {
            return fn.apply(this, arguments);
          } could not be cloned.

      at reportSuccess (node_modules/jest-worker/build/workers/threadChild.js:98:34)

If I change my test to be like:

test('blah', () => {
  try {
    // all test contents here
  } catch (e) {
     console.log(e);
  }
});

I can actually get the real failure. Not a workaround by any means :(

  console.log
    JestAssertionError: expect(received).toHaveBeenCalledOnce(expected)
    
    Expected mock function to have been called exactly once, but it was called:
      0 times
        at Object.toHaveBeenCalledOnce (~/project/src/components/__tests__/Thing.test.tsx:86:25) {
      matcherResult: {
        pass: false,
        message: 'expect(received).toHaveBeenCalledOnce(expected)\n' +
          '\n' +
          'Expected mock function to have been called exactly once, but it was called:\n' +
          '  0 times',
        actual: [Function: mockConstructor] {
          _isMockFunction: true,
          getMockImplementation: [Function (anonymous)],
          mock: [Getter/Setter],
          mockClear: [Function (anonymous)],
          mockReset: [Function (anonymous)],
          mockRestore: [Function (anonymous)],
          mockReturnValueOnce: [Function (anonymous)],
          mockResolvedValueOnce: [Function (anonymous)],
          mockRejectedValueOnce: [Function (anonymous)],
          mockReturnValue: [Function (anonymous)],
          mockResolvedValue: [Function (anonymous)],
          mockRejectedValue: [Function (anonymous)],
          mockImplementationOnce: [Function (anonymous)],
          withImplementation: [Function: bound withImplementation],
          mockImplementation: [Function (anonymous)],
          mockReturnThis: [Function (anonymous)],
          mockName: [Function (anonymous)],
          getMockName: [Function (anonymous)]
        }
      }
    }