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ReactDOMServerIntegrationClassContextType-test.js
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ReactDOMServerIntegrationClassContextType-test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
const ReactDOMServerIntegrationUtils = require('./utils/ReactDOMServerIntegrationTestUtils');
let React;
let ReactDOM;
let ReactDOMServer;
let ReactTestUtils;
function initModules() {
// Reset warning cache.
jest.resetModules();
React = require('react');
ReactDOM = require('react-dom');
ReactDOMServer = require('react-dom/server');
ReactTestUtils = require('react-dom/test-utils');
// Make them available to the helpers.
return {
ReactDOM,
ReactDOMServer,
ReactTestUtils,
};
}
const {resetModules, itRenders} = ReactDOMServerIntegrationUtils(initModules);
describe('ReactDOMServerIntegration', () => {
beforeEach(() => {
resetModules();
});
describe('class contextType', function() {
let PurpleContext, RedContext, Context;
beforeEach(() => {
Context = React.createContext('none');
class Parent extends React.Component {
render() {
return (
<Context.Provider value={this.props.text}>
{this.props.children}
</Context.Provider>
);
}
}
PurpleContext = props => <Parent text="purple">{props.children}</Parent>;
RedContext = props => <Parent text="red">{props.children}</Parent>;
});
itRenders('class child with context', async render => {
class ClassChildWithContext extends React.Component {
static contextType = Context;
render() {
const text = this.context;
return <div>{text}</div>;
}
}
const e = await render(
<PurpleContext>
<ClassChildWithContext />
</PurpleContext>,
);
expect(e.textContent).toBe('purple');
});
itRenders('class child without context', async render => {
class ClassChildWithoutContext extends React.Component {
render() {
// this should render blank; context isn't passed to this component.
return (
<div>{typeof this.context === 'string' ? this.context : ''}</div>
);
}
}
const e = await render(
<PurpleContext>
<ClassChildWithoutContext />
</PurpleContext>,
);
expect(e.textContent).toBe('');
});
itRenders('class child with wrong context', async render => {
class ClassChildWithWrongContext extends React.Component {
static contextType = Context;
render() {
// this should render blank; context.foo isn't passed to this component.
return <div id="classWrongChild">{this.context.foo}</div>;
}
}
const e = await render(
<PurpleContext>
<ClassChildWithWrongContext />
</PurpleContext>,
);
expect(e.textContent).toBe('');
});
itRenders('with context passed through to a grandchild', async render => {
class Grandchild extends React.Component {
static contextType = Context;
render() {
return <div>{this.context}</div>;
}
}
const Child = props => <Grandchild />;
const e = await render(
<PurpleContext>
<Child />
</PurpleContext>,
);
expect(e.textContent).toBe('purple');
});
itRenders('a child context overriding a parent context', async render => {
class Grandchild extends React.Component {
static contextType = Context;
render() {
return <div>{this.context}</div>;
}
}
const e = await render(
<PurpleContext>
<RedContext>
<Grandchild />
</RedContext>
</PurpleContext>,
);
expect(e.textContent).toBe('red');
});
itRenders('multiple contexts', async render => {
const Theme = React.createContext('dark');
const Language = React.createContext('french');
class Parent extends React.Component {
render() {
return (
<Theme.Provider value="light">
<Child />
</Theme.Provider>
);
}
}
function Child() {
return (
<Language.Provider value="english">
<Grandchild />
</Language.Provider>
);
}
class ThemeComponent extends React.Component {
static contextType = Theme;
render() {
return <div id="theme">{this.context}</div>;
}
}
class LanguageComponent extends React.Component {
static contextType = Language;
render() {
return <div id="language">{this.context}</div>;
}
}
const Grandchild = props => {
return (
<div>
<ThemeComponent />
<LanguageComponent />
</div>
);
};
const e = await render(<Parent />);
expect(e.querySelector('#theme').textContent).toBe('light');
expect(e.querySelector('#language').textContent).toBe('english');
});
itRenders('nested context unwinding', async render => {
const Theme = React.createContext('dark');
const Language = React.createContext('french');
class ThemeConsumer extends React.Component {
static contextType = Theme;
render() {
return this.props.children(this.context);
}
}
class LanguageConsumer extends React.Component {
static contextType = Language;
render() {
return this.props.children(this.context);
}
}
const App = () => (
<div>
<Theme.Provider value="light">
<Language.Provider value="english">
<Theme.Provider value="dark">
<ThemeConsumer>
{theme => <div id="theme1">{theme}</div>}
</ThemeConsumer>
</Theme.Provider>
<ThemeConsumer>
{theme => <div id="theme2">{theme}</div>}
</ThemeConsumer>
<Language.Provider value="sanskrit">
<Theme.Provider value="blue">
<Theme.Provider value="red">
<LanguageConsumer>
{() => (
<Language.Provider value="chinese">
<Language.Provider value="hungarian" />
<LanguageConsumer>
{language => <div id="language1">{language}</div>}
</LanguageConsumer>
</Language.Provider>
)}
</LanguageConsumer>
</Theme.Provider>
<LanguageConsumer>
{language => (
<>
<ThemeConsumer>
{theme => <div id="theme3">{theme}</div>}
</ThemeConsumer>
<div id="language2">{language}</div>
</>
)}
</LanguageConsumer>
</Theme.Provider>
</Language.Provider>
</Language.Provider>
</Theme.Provider>
<LanguageConsumer>
{language => <div id="language3">{language}</div>}
</LanguageConsumer>
</div>
);
const e = await render(<App />);
expect(e.querySelector('#theme1').textContent).toBe('dark');
expect(e.querySelector('#theme2').textContent).toBe('light');
expect(e.querySelector('#theme3').textContent).toBe('blue');
expect(e.querySelector('#language1').textContent).toBe('chinese');
expect(e.querySelector('#language2').textContent).toBe('sanskrit');
expect(e.querySelector('#language3').textContent).toBe('french');
});
});
});