Question

我目前正致力于为react-navigation添加jest单元测试，例如：我的StackNavigator

const Nav = StackNavigator({
    Home: {
        screen: Home,
    },

    Second: {
        screen: Second,
    }
});

export default class App extends Component<{}> {
  render() {
    return (
      <Nav/>
    );
  }
}

我的主页组件

export default class Home extends Component<{}> {

    _goToNextPage = () => {
        this.props.navigation.navigate('Second');
    }

    render() {
        return (
            <View>
                <Text>Home</Text>
                <Button
                    onPress={this._goToNextPage}
                    title="Go to Second Page"
                >Click to next page</Button>
            </View>
    );
    }
}

我的第二部分 export default class Second extends Component＆lt; {}＆gt; {

render() {
    return (
        <View>
            <Text>Second</Text>
        </View>
    );
}

}

当我点击GoToNextPage按钮，第二个组件应该正确渲染时，我应该如何编写测试单元测试来测试？“

我没有找到任何有关反应导航的开玩笑的有用信息，任何帮助将非常感谢!!!

非常感谢〜

Answer 1

我个人喜欢@testing-library/react，因为他们围绕着从用户角度进行测试的理念。我以为您的测试将如下所示：

it('shows the second component when the next button is clicked', async () => {
  // Renders your app
  const { getByText, findByText } = render(<App />);
  // Clicks your button
  fireEvent.click(getByText('Click to next page'));
  // Waits for the 'Second' text to be visible, could be async or sync, in this
  // case I'm using the async expectation style
  await wait(() => expect(getByText('Second')));
});

我将通过简单地呈现第二个组件并根据快照对其进行检查的方式，将按钮的单击和其正确呈现的验证的关注点分离开来进行测试。

// inside your second component test - still using testing-library
it('matches the snapshot', () => {
  expect(render(<Second />).container).toMatchSnapshot();
});

如何用react-navigation实现jest单元测试

1 个答案: