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ReactPure-test.internal.js
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ReactPure-test.internal.js
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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* 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
* @jest-environment node
*/
/* eslint-disable no-func-assign */
'use strict';
let React;
let ReactFeatureFlags;
let ReactNoop;
describe('pure', () => {
beforeEach(() => {
jest.resetModules();
ReactFeatureFlags = require('shared/ReactFeatureFlags');
ReactFeatureFlags.debugRenderPhaseSideEffectsForStrictMode = false;
React = require('react');
ReactNoop = require('react-noop-renderer');
});
function span(prop) {
return {type: 'span', children: [], prop};
}
function Text(props) {
ReactNoop.yield(props.text);
return <span prop={props.text} />;
}
// Tests should run against both the lazy and non-lazy versions of `pure`.
// To make the tests work for both versions, we wrap the non-lazy version in
// a lazy function component.
sharedTests('normal', (...args) => {
const Pure = React.pure(...args);
function Indirection(props, ref) {
return <Pure {...props} ref={ref} />;
}
return Promise.resolve(React.forwardRef(Indirection));
});
sharedTests('lazy', (...args) => Promise.resolve(React.pure(...args)));
function sharedTests(label, pure) {
describe(`${label}`, () => {
it('bails out on props equality', async () => {
const {unstable_Suspense: Suspense} = React;
function Counter({count}) {
return <Text text={count} />;
}
Counter = pure(Counter);
ReactNoop.render(
<Suspense>
<Counter count={0} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual([]);
await Promise.resolve();
expect(ReactNoop.flush()).toEqual([0]);
expect(ReactNoop.getChildren()).toEqual([span(0)]);
// Should bail out because props have not changed
ReactNoop.render(
<Suspense>
<Counter count={0} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual([]);
expect(ReactNoop.getChildren()).toEqual([span(0)]);
// Should update because count prop changed
ReactNoop.render(
<Suspense>
<Counter count={1} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual([1]);
expect(ReactNoop.getChildren()).toEqual([span(1)]);
});
it("does not bail out if there's a context change", async () => {
const {unstable_Suspense: Suspense} = React;
const CountContext = React.createContext(0);
function readContext(Context) {
const dispatcher =
React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED
.ReactCurrentOwner.currentDispatcher;
return dispatcher.readContext(Context);
}
function Counter(props) {
const count = readContext(CountContext);
return <Text text={`${props.label}: ${count}`} />;
}
Counter = pure(Counter);
class Parent extends React.Component {
state = {count: 0};
render() {
return (
<Suspense>
<CountContext.Provider value={this.state.count}>
<Counter label="Count" />
</CountContext.Provider>
</Suspense>
);
}
}
const parent = React.createRef(null);
ReactNoop.render(<Parent ref={parent} />);
expect(ReactNoop.flush()).toEqual([]);
await Promise.resolve();
expect(ReactNoop.flush()).toEqual(['Count: 0']);
expect(ReactNoop.getChildren()).toEqual([span('Count: 0')]);
// Should bail out because props have not changed
ReactNoop.render(<Parent ref={parent} />);
expect(ReactNoop.flush()).toEqual([]);
expect(ReactNoop.getChildren()).toEqual([span('Count: 0')]);
// Should update because there was a context change
parent.current.setState({count: 1});
expect(ReactNoop.flush()).toEqual(['Count: 1']);
expect(ReactNoop.getChildren()).toEqual([span('Count: 1')]);
});
it('accepts custom comparison function', async () => {
const {unstable_Suspense: Suspense} = React;
function Counter({count}) {
return <Text text={count} />;
}
Counter = pure(Counter, (oldProps, newProps) => {
ReactNoop.yield(
`Old count: ${oldProps.count}, New count: ${newProps.count}`,
);
return oldProps.count === newProps.count;
});
ReactNoop.render(
<Suspense>
<Counter count={0} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual([]);
await Promise.resolve();
expect(ReactNoop.flush()).toEqual([0]);
expect(ReactNoop.getChildren()).toEqual([span(0)]);
// Should bail out because props have not changed
ReactNoop.render(
<Suspense>
<Counter count={0} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual(['Old count: 0, New count: 0']);
expect(ReactNoop.getChildren()).toEqual([span(0)]);
// Should update because count prop changed
ReactNoop.render(
<Suspense>
<Counter count={1} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual(['Old count: 0, New count: 1', 1]);
expect(ReactNoop.getChildren()).toEqual([span(1)]);
});
it('warns for class components', () => {
class SomeClass extends React.Component {
render() {
return null;
}
}
expect(() => pure(SomeClass)).toWarnDev(
'pure: The first argument must be a function component.',
{withoutStack: true},
);
});
it('warns if first argument is not a function', () => {
expect(() => pure()).toWarnDev(
'pure: The first argument must be a function component. Instead ' +
'received: undefined',
{withoutStack: true},
);
});
it('forwards ref', async () => {
const {unstable_Suspense: Suspense} = React;
const Transparent = pure((props, ref) => {
return <div ref={ref} />;
});
const divRef = React.createRef();
ReactNoop.render(
<Suspense>
<Transparent ref={divRef} />
</Suspense>,
);
ReactNoop.flush();
await Promise.resolve();
ReactNoop.flush();
expect(divRef.current.type).toBe('div');
});
it('updates if only ref changes', async () => {
const {unstable_Suspense: Suspense} = React;
const Transparent = pure((props, ref) => {
return [<Text key="text" text="Text" />, <div key="div" ref={ref} />];
});
const divRef = React.createRef();
const divRef2 = React.createRef();
ReactNoop.render(
<Suspense>
<Transparent ref={divRef} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual([]);
await Promise.resolve();
expect(ReactNoop.flush()).toEqual(['Text']);
expect(divRef.current.type).toBe('div');
expect(divRef2.current).toBe(null);
// Should re-render (new ref)
ReactNoop.render(
<Suspense>
<Transparent ref={divRef2} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual(['Text']);
expect(divRef.current).toBe(null);
expect(divRef2.current.type).toBe('div');
// Should not re-render (same ref)
ReactNoop.render(
<Suspense>
<Transparent ref={divRef2} />
</Suspense>,
);
expect(ReactNoop.flush()).toEqual([]);
expect(divRef.current).toBe(null);
expect(divRef2.current.type).toBe('div');
});
});
}
});