mirror of
https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Dan Abramov
5dce7c21e3
* Comment previous occurrences of this issue
* Fix DEV performance regression in V8
* Extract try/catch into a separate function when calling hooks
(cherry picked from commit afa27bc4d5)
76 lines
2.1 KiB
JavaScript
76 lines
2.1 KiB
JavaScript
/**
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* Copyright 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @emails react-core
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*/
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'use strict';
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describe('ReactDOMDebugTool', function() {
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var ReactDOMDebugTool;
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beforeEach(function() {
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jest.resetModuleRegistry();
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ReactDOMDebugTool = require('ReactDOMDebugTool');
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});
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it('should add and remove hooks', () => {
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var handler1 = jasmine.createSpy('spy');
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var handler2 = jasmine.createSpy('spy');
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var hook1 = {onTestEvent: handler1};
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var hook2 = {onTestEvent: handler2};
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ReactDOMDebugTool.addHook(hook1);
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ReactDOMDebugTool.onTestEvent();
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expect(handler1.calls.count()).toBe(1);
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expect(handler2.calls.count()).toBe(0);
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ReactDOMDebugTool.onTestEvent();
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expect(handler1.calls.count()).toBe(2);
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expect(handler2.calls.count()).toBe(0);
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ReactDOMDebugTool.addHook(hook2);
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ReactDOMDebugTool.onTestEvent();
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expect(handler1.calls.count()).toBe(3);
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expect(handler2.calls.count()).toBe(1);
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ReactDOMDebugTool.onTestEvent();
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expect(handler1.calls.count()).toBe(4);
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expect(handler2.calls.count()).toBe(2);
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ReactDOMDebugTool.removeHook(hook1);
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ReactDOMDebugTool.onTestEvent();
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expect(handler1.calls.count()).toBe(4);
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expect(handler2.calls.count()).toBe(3);
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ReactDOMDebugTool.removeHook(hook2);
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ReactDOMDebugTool.onTestEvent();
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expect(handler1.calls.count()).toBe(4);
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expect(handler2.calls.count()).toBe(3);
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});
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it('warns once when an error is thrown in hook', () => {
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spyOn(console, 'error');
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ReactDOMDebugTool.addHook({
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onTestEvent() {
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throw new Error('Hi.');
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},
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});
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ReactDOMDebugTool.onTestEvent();
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expect(console.error.calls.count()).toBe(1);
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expect(console.error.calls.argsFor(0)[0]).toContain(
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'Exception thrown by hook while handling ' +
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'onTestEvent: Error: Hi.'
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);
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ReactDOMDebugTool.onTestEvent();
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expect(console.error.calls.count()).toBe(1);
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});
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});
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