如何在Jest中测试React Native Button？

Question

How could I test a press in react native? (react-native-elements) So the code I want to test is:

<ListItem
    containerStyle={styles.container} 
    titleContainerStyle={styles.title} 
    chevronColor={'#70be1d'} 
    rightIcon={{name:'check'}}
    key={id} 
    title={name}
    hideChevron={!checked} 
    onPress={ ()=>onMeasureRowPressed(id) }  
/>

Answer 1

You can approach this in two different ways, direct or indirect.

direct:

 const wrapper = shallow(< ListItem />);
    const instance = wrapper.instance();
    expect(wrapper.state('pressedRow')).toBe('');
    instance.onMeasureRowPressed('1234');
    expect(wrapper.state('pressedRow')).toBe('1234');

indirect:

const wrapper = shallow(<ListItem />);
    expect(wrapper.state('pressedRow')).toBe('');
    wrapper.find('ListItem').simulate('keyPress', {key: 'foo'});
    expect(wrapper.state('pressedRow')).toBe('1234');