如何在jest中使用reselect createSelector函数进行测试？

// selectors.js
import { createSelector } from 'reselect';

const getItems = (state) => state.items;
const getFilter = (state) => state.filter;

export const getFilteredItems = createSelector(
  [getItems, getFilter],
  (items, filter) => {
    return items.filter(item => item.includes(filter));
  }
);

// selectors.test.js
import { getFilteredItems } from './selectors';

describe('getFilteredItems selector', () => {
  it('should return filtered items based on the filter', () => {
    const state = {
      items: ['apple', 'banana', 'grape', 'orange'],
      filter: 'ap'
    };

    const expected = ['apple', 'grape'];
    const result = getFilteredItems(state);

    expect(result).toEqual(expected);
  });

  it('should return all items if filter is empty', () => {
    const state = {
      items: ['apple', 'banana', 'grape', 'orange'],
      filter: ''
    };

    const expected = ['apple', 'banana', 'grape', 'orange'];
    const result = getFilteredItems(state);

    expect(result).toEqual(expected);
  });

  it('should return an empty array if no items match the filter', () => {
    const state = {
      items: ['apple', 'banana', 'grape', 'orange'],
      filter: 'xyz'
    };

    const expected = [];
    const result = getFilteredItems(state);

    expect(result).toEqual(expected);
  });

  it('should memoize the result for the same input', () => {
    const state = {
      items: ['apple', 'banana', 'grape', 'orange'],
      filter: 'ap'
    };

    const result1 = getFilteredItems(state);
    const result2 = getFilteredItems(state);

    expect(result1).toBe(result2); // Same reference
  });

  it('should recompute the result if the input changes', () => {
    const state1 = {
      items: ['apple', 'banana', 'grape', 'orange'],
      filter: 'ap'
    };

    const state2 = {
      items: ['apple', 'banana', 'grape', 'orange'],
      filter: 'ba'
    };

    const result1 = getFilteredItems(state1);
    const result2 = getFilteredItems(state2);

    expect(result1).not.toBe(result2); // Different reference
    expect(result2).toEqual(['banana']);
  });
});

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