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,我们正在安装单个组件(用酶的mount()
),而不使用它们的<IntlProvider />
父包装。这可以通过包装提供者来解决,但是root
指向IntlProvider
实例,而不是CustomComponent
。
反应试验.Intl:酶文档仍然是空的。
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)(酶+ 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,由于我们的组件使用FormattedMessage
作为react-intl
库的一部分,所以在运行上面的代码时会出现以下错误:
Uncaught Invariant Violation: [React Intl] Could not find required `intl` object. <IntlProvider> needs to exist in the component ancestry.
用IntlProvider
包装的
const wrapper = mount(
<IntlProvider locale="en">
<CustomComponent
params={params}
/>
</IntlProvider>
);
这为CustomComponent
提供了它所要求的intl
上下文。但是,在尝试执行这样的测试断言时:
expect( wrapper.state('foo') ).to.equal('bar');
引发以下异常:
AssertionError: expected undefined to equal ''
当然,这是因为它试图读取IntlProvider
的状态,而不是我们的CustomComponent
。
访问CustomComponent
的尝试
我尝试了以下几点,但没有结果:
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:如何在仍然能够在我们的CustomComponent
CustomComponent
上执行“根”操作的同时,用 intl
上下文安装?
发布于 2016-05-04 09:03:27
我创建了一个辅助函数来修补现有的酶mount()
和shallow()
函数。我们现在在所有使用React组件的测试中使用这些助手方法。
你可以在这里找到要点:https://gist.github.com/mirague/c05f4da0d781a9b339b501f1d5d33c37
为了保持数据的可访问性,下面是一个简单的代码:
helpers/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 }
});
}
};
CustomComponent
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
https://stackoverflow.com/questions/37021217
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