worker.js

const fs = require('fs');
const expect = require('expect');
const mock = require('jest-mock');
const {describe, it, run, resetState} = require('jest-circus');
const vm = require('vm');
const NodeEnvironment = require('jest-environment-node').default;
const {dirname, basename, join} = require('path');

exports.runTest = async function (testFile) {
  const testResult = {
    success: false,
    errorMessage: null,
  };
  try {
    resetState();
    let environment;
    const customRequire = (fileName) => {
      const code = fs.readFileSync(join(dirname(testFile), fileName), 'utf8');
      const moduleFactory = vm.runInContext(
        `(function(module, require) {${code}})`,
        environment.getVmContext(),
      );
      const module = {exports: {}};
      moduleFactory(module, customRequire);
      return module.exports;
    };
    environment = new NodeEnvironment({
      projectConfig: {
        testEnvironmentOptions: {
          describe,
          it,
          expect,
          mock,
        },
      },
    });
    customRequire(basename(testFile));
    const {testResults} = await run();
    testResult.testResults = testResults;
    testResult.success = testResults.every((result) => !result.errors.length);
  } catch (error) {
    testResult.errorMessage = error.message;
  }
  return testResult;
};