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编辑:解决了!向下滚动寻找答案


在我们的组件测试中,我们需要它们能够访问react-intl上下文。问题是我们在没有父包装器的情况下安装单个组件(使用 Enzyme's mount()) 。<IntlProvider />这可以通过将提供者包裹起来但随后root指向IntlProvider实例而不是指向来解决CustomComponent

使用React-Intl 进行测试:酶文档仍然是空的。

<自定义组件 />

class CustomComponent extends Component {
  state = {
    foo: 'bar'
  }

  render() {
    return (
      <div>
        <FormattedMessage id="world.hello" defaultMessage="Hello World!" />
      </div>
    );
  }
}

标准测试用例(所需)(Enzyme + Mocha + Chai)

// This is how we mount components normally with Enzyme
const wrapper = mount(
  <CustomComponent
    params={params}
  />
);

expect( wrapper.state('foo') ).to.equal('bar');

但是,由于我们的组件FormattedMessage用作库的一部分,因此react-intl在运行上述代码时会出现此错误:

Uncaught Invariant Violation: [React Intl] Could not find required `intl` object. <IntlProvider> needs to exist in the component ancestry.


用它包裹起来IntlProvider

const wrapper = mount(
  <IntlProvider locale="en">
    <CustomComponent
      params={params}
    />
  </IntlProvider>
);

这提供CustomComponentintl它所要求的上下文。但是,当尝试执行以下测试断言时:

expect( wrapper.state('foo') ).to.equal('bar');

引发以下异常:

AssertionError: expected undefined to equal ''

这当然是因为它试图读取的状态IntlProvider而不是我们的CustomComponent.


尝试访问CustomComponent

我尝试了以下方法无济于事:

const wrapper = mount(
  <IntlProvider locale="en">
    <CustomComponent
      params={params}
    />
  </IntlProvider>
);


// Below cases have all individually been tried to call `.state('foo')` on:
// expect( component.state('foo') ).to.equal('bar');

const component = wrapper.childAt(0); 
> Error: ReactWrapper::state() can only be called on the root

const component = wrapper.children();
> Error: ReactWrapper::state() can only be called on the root

const component = wrapper.children();
component.root = component;
> TypeError: Cannot read property 'getInstance' of null

问题是:我们如何在安装CustomComponent上下文的intl同时仍然能够对我们的 执行“root”操作CustomComponent

4

1 回答 1

27

我创建了一个辅助函数来修补现有的酶mount()shallow()函数。我们现在在使用 React Intl 组件的所有测试中都使用这些辅助方法。

你可以在这里找到要点:https ://gist.github.com/mirague/c05f4da0d781a9b339b501f1d5d33c37


为了保持数据可访问性,这里的代码简而言之:

助手/intl-test.js

/**
 * Components using the react-intl module require access to the intl context.
 * This is not available when mounting single components in Enzyme.
 * These helper functions aim to address that and wrap a valid,
 * English-locale intl context around them.
 */

import React from 'react';
import { IntlProvider, intlShape } from 'react-intl';
import { mount, shallow } from 'enzyme';

const messages = require('../locales/en'); // en.json
const intlProvider = new IntlProvider({ locale: 'en', messages }, {});
const { intl } = intlProvider.getChildContext();

/**
 * When using React-Intl `injectIntl` on components, props.intl is required.
 */
function nodeWithIntlProp(node) {
  return React.cloneElement(node, { intl });
}

export default {
  shallowWithIntl(node) {
    return shallow(nodeWithIntlProp(node), { context: { intl } });
  },

  mountWithIntl(node) {
    return mount(nodeWithIntlProp(node), {
      context: { intl },
      childContextTypes: { intl: intlShape }
    });
  }
};

自定义组件

class CustomComponent extends Component {
  state = {
    foo: 'bar'
  }

  render() {
    return (
      <div>
        <FormattedMessage id="world.hello" defaultMessage="Hello World!" />
      </div>
    );
  }
}

CustomComponentTest.js

import { mountWithIntl } from 'helpers/intl-test';

const wrapper = mountWithIntl(
  <CustomComponent />
);

expect(wrapper.state('foo')).to.equal('bar'); // OK
expect(wrapper.text()).to.equal('Hello World!'); // OK
于 2016-05-04T09:03:27.913 回答