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can not use function getReact on some components

See original GitHub issue

I tried to use the component to get props of some react component in the site: http://demo.keystonejs.com/keystone/signin , but it is always return null on some react components: SigninView, AlertView, Brand, LoginForm. Please take a look at my script as below:

import ReactSelector from 'testcafe-react-selectors';

fixture `Todo App test`
	.page `http://demo.keystonejs.com/keystone/signin`;

test('[demo]: login failed', async t => {
  const allProps = await ReactSelector('SigninView').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps);

  const allProps1 = await ReactSelector('AlertView').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps1);

  const allProps2 = await ReactSelector('Brand').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps2);

  const allProps3 = await ReactSelector('LoginForm').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps3);

  const allProps4 = await ReactSelector('Form').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps4);

  const allProps5 = await ReactSelector('FormField').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps5);

  const allProps6 = await ReactSelector('Button').getReact(({props}) => {
    let string
    Object.keys(props).forEach((key) => {
      string = string + `${key} --`;
    })
    return string;
  })
  console.log(allProps6);

})