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ReactDevToolsHooksIntegration-test.js
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ReactDevToolsHooksIntegration-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
* @jest-environment node
*/
'use strict';
describe('React hooks DevTools integration', () => {
let React;
let ReactDebugTools;
let ReactTestRenderer;
let Scheduler;
let act;
let overrideHookState;
let scheduleUpdate;
let setSuspenseHandler;
beforeEach(() => {
global.__REACT_DEVTOOLS_GLOBAL_HOOK__ = {
inject: injected => {
overrideHookState = injected.overrideHookState;
scheduleUpdate = injected.scheduleUpdate;
setSuspenseHandler = injected.setSuspenseHandler;
},
supportsFiber: true,
onCommitFiberRoot: () => {},
onCommitFiberUnmount: () => {},
};
jest.resetModules();
React = require('react');
ReactDebugTools = require('react-debug-tools');
ReactTestRenderer = require('react-test-renderer');
Scheduler = require('scheduler');
act = ReactTestRenderer.act;
});
it('should support editing useState hooks', () => {
let setCountFn;
function MyComponent() {
const [count, setCount] = React.useState(0);
setCountFn = setCount;
return <div>count:{count}</div>;
}
const renderer = ReactTestRenderer.create(<MyComponent />);
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['count:', '0'],
});
const fiber = renderer.root.findByType(MyComponent)._currentFiber();
const tree = ReactDebugTools.inspectHooksOfFiber(fiber);
const stateHook = tree[0];
expect(stateHook.isStateEditable).toBe(true);
if (__DEV__) {
overrideHookState(fiber, stateHook.id, [], 10);
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['count:', '10'],
});
act(() => setCountFn(count => count + 1));
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['count:', '11'],
});
}
});
it('should support editable useReducer hooks', () => {
const initialData = {foo: 'abc', bar: 123};
function reducer(state, action) {
switch (action.type) {
case 'swap':
return {foo: state.bar, bar: state.foo};
default:
throw new Error();
}
}
let dispatchFn;
function MyComponent() {
const [state, dispatch] = React.useReducer(reducer, initialData);
dispatchFn = dispatch;
return (
<div>
foo:{state.foo}, bar:{state.bar}
</div>
);
}
const renderer = ReactTestRenderer.create(<MyComponent />);
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['foo:', 'abc', ', bar:', '123'],
});
const fiber = renderer.root.findByType(MyComponent)._currentFiber();
const tree = ReactDebugTools.inspectHooksOfFiber(fiber);
const reducerHook = tree[0];
expect(reducerHook.isStateEditable).toBe(true);
if (__DEV__) {
overrideHookState(fiber, reducerHook.id, ['foo'], 'def');
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['foo:', 'def', ', bar:', '123'],
});
act(() => dispatchFn({type: 'swap'}));
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['foo:', '123', ', bar:', 'def'],
});
}
});
// This test case is based on an open source bug report:
// facebookincubator/redux-react-hook/issues/34#issuecomment-466693787
it('should handle interleaved stateful hooks (e.g. useState) and non-stateful hooks (e.g. useContext)', () => {
const MyContext = React.createContext(1);
let setStateFn;
function useCustomHook() {
const context = React.useContext(MyContext);
const [state, setState] = React.useState({count: context});
React.useDebugValue(state.count);
setStateFn = setState;
return state.count;
}
function MyComponent() {
const count = useCustomHook();
return <div>count:{count}</div>;
}
const renderer = ReactTestRenderer.create(<MyComponent />);
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['count:', '1'],
});
const fiber = renderer.root.findByType(MyComponent)._currentFiber();
const tree = ReactDebugTools.inspectHooksOfFiber(fiber);
const stateHook = tree[0].subHooks[1];
expect(stateHook.isStateEditable).toBe(true);
if (__DEV__) {
overrideHookState(fiber, stateHook.id, ['count'], 10);
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['count:', '10'],
});
act(() => setStateFn(state => ({count: state.count + 1})));
expect(renderer.toJSON()).toEqual({
type: 'div',
props: {},
children: ['count:', '11'],
});
}
});
it('should support overriding suspense in sync mode', () => {
if (__DEV__) {
// Lock the first render
setSuspenseHandler(() => true);
}
function MyComponent() {
return 'Done';
}
const renderer = ReactTestRenderer.create(
<div>
<React.Suspense fallback={'Loading'}>
<MyComponent />
</React.Suspense>
</div>,
);
const fiber = renderer.root._currentFiber().child;
if (__DEV__) {
// First render was locked
expect(renderer.toJSON().children).toEqual(['Loading']);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Loading']);
// Release the lock
setSuspenseHandler(() => false);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
// Lock again
setSuspenseHandler(() => true);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Loading']);
// Release the lock again
setSuspenseHandler(() => false);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
// Ensure it checks specific fibers.
setSuspenseHandler(f => f === fiber || f === fiber.alternate);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Loading']);
setSuspenseHandler(f => f !== fiber && f !== fiber.alternate);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
} else {
expect(renderer.toJSON().children).toEqual(['Done']);
}
});
it('should support overriding suspense in concurrent mode', () => {
if (__DEV__) {
// Lock the first render
setSuspenseHandler(() => true);
}
function MyComponent() {
return 'Done';
}
const renderer = ReactTestRenderer.create(
<div>
<React.Suspense fallback={'Loading'}>
<MyComponent />
</React.Suspense>
</div>,
{unstable_isConcurrent: true},
);
expect(Scheduler).toFlushAndYield([]);
const fiber = renderer.root._currentFiber().child;
if (__DEV__) {
// First render was locked
expect(renderer.toJSON().children).toEqual(['Loading']);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Loading']);
// Release the lock
setSuspenseHandler(() => false);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
// Lock again
setSuspenseHandler(() => true);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Loading']);
// Release the lock again
setSuspenseHandler(() => false);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
// Ensure it checks specific fibers.
setSuspenseHandler(f => f === fiber || f === fiber.alternate);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Loading']);
setSuspenseHandler(f => f !== fiber && f !== fiber.alternate);
scheduleUpdate(fiber); // Re-render
expect(renderer.toJSON().children).toEqual(['Done']);
} else {
expect(renderer.toJSON().children).toEqual(['Done']);
}
});
});