After upgrading the version of Jest to the latest one my unit tests for pipe are failing. The initial error I was getting was:

jest Cannot set property of [object Object] which has only a getter

This error was not present in the earlier version (24).

I found a similar problem but unfortunately the applied solution did not help in my case.

This is my pipe:

@Pipe({
  name: 'standPermissionIds',
})
export class StandPermissionIdsPipe implements PipeTransform {
  transform(value: Stands): StandIdentifiers | undefined {
    if (!value) {
      return;
    }
    return extractStandIdentifiers(value);
  }
}

and tests for that (before applying the solution to get rid off 'getter' error):

import { StandPermissionIdsPipe } from '@sam-hmi/shared/pipes/stand-permission-ids.pipe';
import { extractStandIdentifiers } from '@sam-hmi/utils';

describe('StandPermissionIdsPipe', () => {
  let pipe;

  beforeEach(() => {
    pipe = new StandPermissionIdsPipe();
    (extractStandIdentifiers as jest.Mock) = jest.fn();
  });

  it('should call extractStandIdentifiers and return the value', () => {
    pipe.transform('test');
    expect(extractStandIdentifiers).toBeCalledWith('test');
  });
});

and after applying it:

import { StandPermissionIdsPipe } from '@sam-hmi/shared/pipes/stand-permission-ids.pipe';

describe('StandPermissionIdsPipe', () => {
  let pipe;
  let extractStandIdentifiers;

  beforeEach(() => {
    pipe = new StandPermissionIdsPipe();
    extractStandIdentifiers = jest.mock('@sam-hmi/utils', () => ({
      ...jest.requireActual('@sam-hmi/utils'),
    }));
  });

  it('should call extractStandIdentifiers and return the value', () => {
    pipe.transform('test');
    expect(extractStandIdentifiers).toHaveBeenCalledWith('test');
  });
});

In that case the error message is about something else but probably because I screwed applying the solution:

And this is how the extractStandIdentifiers looks like:

export const extractStandIdentifiers = (stand: Stands): StandIdentifiers => {
  const { standId, terminalFk, apronFk, stationFk } = stand;
  return {
    standId,
    terminalId: terminalFk ? terminalFk.terminalId : undefined,
    apronId: apronFk ? apronFk.apronId : undefined,
    stationId: stationFk ? stationFk.stationId : undefined,
  };
};

Can someone please explain to me how to solve this and what has changed and why I started getting these errors in the newer version of Jest?