forked from facebook/react
/
ReactDOMServerIntegrationSpecialTypes-test.js
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ReactDOMServerIntegrationSpecialTypes-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 forwardRef;
let memo;
let yieldedValues;
let yieldValue;
let clearYields;
function initModules() {
// Reset warning cache.
jest.resetModuleRegistry();
React = require('react');
ReactDOM = require('react-dom');
ReactDOMServer = require('react-dom/server');
forwardRef = React.forwardRef;
memo = React.memo;
yieldedValues = [];
yieldValue = value => {
yieldedValues.push(value);
};
clearYields = () => {
const ret = yieldedValues;
yieldedValues = [];
return ret;
};
// Make them available to the helpers.
return {
ReactDOM,
ReactDOMServer,
};
}
const {resetModules, itRenders} = ReactDOMServerIntegrationUtils(initModules);
describe('ReactDOMServerIntegration', () => {
beforeEach(() => {
resetModules();
});
itRenders('a forwardedRef component and its children', async render => {
const FunctionComponent = ({label, forwardedRef}) => (
<div ref={forwardedRef}>{label}</div>
);
const WrappedFunctionComponent = forwardRef((props, ref) => (
<FunctionComponent {...props} forwardedRef={ref} />
));
const ref = React.createRef();
const element = await render(
<WrappedFunctionComponent ref={ref} label="Test" />,
);
const parent = element.parentNode;
const div = parent.childNodes[0];
expect(div.tagName).toBe('DIV');
expect(div.textContent).toBe('Test');
});
itRenders('a Profiler component and its children', async render => {
const element = await render(
<React.Profiler id="profiler" onRender={jest.fn()}>
<div>Test</div>
</React.Profiler>,
);
const parent = element.parentNode;
const div = parent.childNodes[0];
expect(div.tagName).toBe('DIV');
expect(div.textContent).toBe('Test');
});
describe('memoized function components', () => {
beforeEach(() => {
resetModules();
});
function Text({text}) {
yieldValue(text);
return <span>{text}</span>;
}
function Counter({count}) {
return <Text text={'Count: ' + count} />;
}
itRenders('basic render', async render => {
const MemoCounter = memo(Counter);
const domNode = await render(<MemoCounter count={0} />);
expect(domNode.textContent).toEqual('Count: 0');
});
itRenders('composition with forwardRef', async render => {
const RefCounter = (props, ref) => <Counter count={ref.current} />;
const MemoRefCounter = memo(forwardRef(RefCounter));
const ref = React.createRef();
ref.current = 0;
await render(<MemoRefCounter ref={ref} />);
expect(clearYields()).toEqual(['Count: 0']);
});
itRenders('with comparator', async render => {
const MemoCounter = memo(Counter, (oldProps, newProps) => false);
await render(<MemoCounter count={0} />);
expect(clearYields()).toEqual(['Count: 0']);
});
itRenders(
'comparator functions are not invoked on the server',
async render => {
const MemoCounter = React.memo(Counter, (oldProps, newProps) => {
yieldValue(
`Old count: ${oldProps.count}, New count: ${newProps.count}`,
);
return oldProps.count === newProps.count;
});
await render(<MemoCounter count={0} />);
expect(clearYields()).toEqual(['Count: 0']);
},
);
});
});