Testing RN Input Component with Enzyme

MyInput.spec.js

import React, { Component } from 'react'
import { TextInput } from 'react-native'
import { shallow, configure } from 'enzyme'
import Adapter from 'enzyme-adapter-react-16'
import renderer from 'react-test-renderer'
import { SearchBar } from 'react-native-elements'

configure({ adapter: new Adapter() })

class MyInput extends Component {
  constructor(props) {
    super(props)
    this.state = { text: 'Useless Placeholder' }
  }

  render() {
    return (
      <SearchBar
        style={{ height: 40, borderColor: 'gray', borderWidth: 1 }}
        onChangeText={text => {
          this.setState({ text })
        }}
        value={this.state.text}
      />
    )
  }
}

describe('(MyInput) is ', () => {
  it('sends notification on input changes', () => {
    const wrapper = shallow(<MyInput />)
    wrapper
      .find(SearchBar)
      .first()
      .simulate('ChangeText', '42')
    expect(wrapper.state()).toEqual({ text: '42' })
  })
})