@vergiss/chooks/es/hooks/useChangedProps/__tests__/index.test.js

React hooks library

import { renderHook } from '@testing-library/react-hooks';
import { useChangedProps } from '../index';
describe('useChangedProps', function () {
  it('should be defined', function () {
    expect(useChangedProps).toBeDefined();
  });
  it('should invoke callback', function () {
    var props = {
      name: 'coma'
    };
    var callback = jest.fn().mockReturnValue(void 0);
    var hook = renderHook(function () {
      return useChangedProps(props, callback);
    }, {
      initialProps: props
    });
    props = {
      name: 'cc'
    };
    hook.rerender();
    expect(callback).toBeCalledTimes(1);
  });
  it('should not invoke callback', function () {
    var props = {
      name: 'coma'
    };
    var callback = jest.fn().mockReturnValue(void 0);
    var hook = renderHook(function () {
      return useChangedProps(props, callback);
    }, {
      initialProps: props
    });
    hook.rerender();
    expect(callback).toBeCalledTimes(0);
  });
});