How to use the @redux-saga/testing-utils.createMockTask function in @redux-saga/testing-utils

t.test('another validation initiated', assert => {
    const tasks = new Map();
    const firstTask = createMockTask();
    const secondTask = createMockTask();
    testSaga(validateSourceSaga, tasks, action)
      .next()
      .call(importValidations)
      .next({javascript})
      .fork(javascript, source, projectAttributes)
      .next(firstTask)
      .join(firstTask);

    testSaga(validateSourceSaga, tasks, action)
      .next()
      .cancel(firstTask)
      .next()
      .call(importValidations)
      .next({javascript})
      .fork(javascript, source, projectAttributes)
      .next(secondTask)

t.test('another validation initiated', assert => {
    const tasks = new Map();
    const firstTask = createMockTask();
    const secondTask = createMockTask();
    testSaga(validateSourceSaga, tasks, action)
      .next()
      .call(importValidations)
      .next({javascript})
      .fork(javascript, source, projectAttributes)
      .next(firstTask)
      .join(firstTask);

    testSaga(validateSourceSaga, tasks, action)
      .next()
      .cancel(firstTask)
      .next()
      .call(importValidations)
      .next({javascript})
      .fork(javascript, source, projectAttributes)

t.test('validation completes', assert => {
    const tasks = new Map();
    const task = createMockTask();
    testSaga(validateSourceSaga, tasks, action)
      .next()
      .call(importValidations)
      .next({javascript})
      .fork(javascript, source, projectAttributes)
      .next(task)
      .join(task)
      .next(errors)
      .put(validatedSource(language, errors))
      .next()
      .isDone();
    assert.end();
  });

test('should cancel autoRefresh task if it is running', () => {
      const mockLoaderTask = createMockTask();
      mockLoaderTask.name = 'autoRefresh';
      mockLoaderTask.meta = { loader: 'test-loader' };
      const startGen = dataLoaderFlow(startRefreshAction);
      startGen.next();
      startGen.next(mockLoaderTask);
      expect(gen.next(stopRefreshAction).value).toEqual(cancel(mockLoaderTask));
    });
  });