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How to use restorer method in sinon

Best JavaScript code snippet using sinon

index.test.js

Source:index.test.js

1jest.mock('../util/get_window');2var getWindowModule = require('../util/get_window');3var scrollRestorer = require('../index');4describe('scroll-restorer', function() {5  beforeEach(function() {6    // Mock the window object.7    jest.spyOn(getWindowModule, 'getWindow').mockReturnValue({8      addEventListener: jest.fn(),9      document: {10        body: {11          scrollHeight: 10012        }13      },14      history: {15        replaceState: jest.fn(),16        scrollRestoration: 'foo',17        state: {18          scroll: {19            x: 0,20            y: 021          }22        }23      },24      location: 'foo',25      pageXOffset: 0,26      pageYOffset: 0,27      removeEventListener: jest.fn(),28      replaceState: jest.fn(),29      // We just invoke requestAnimationFrame functions immediately.30      requestAnimationFrame: function(fn) {31        fn();32      },33      scrollTo: jest.fn()34    });35  });36  afterEach(function() {37    getWindowModule.getWindow.mockRestore();38  });39  describe('start', function() {40    it('adds a scroll event listener', function() {41      scrollRestorer.start();42      var addEventListenerArgs = getWindowModule.getWindow().addEventListener43        .mock.calls[0];44      expect(addEventListenerArgs[0]).toBe('scroll');45    });46    it('adds a scroll event listener with passive option enabled', function() {47      scrollRestorer.start();48      var addEventListenerArgs = getWindowModule.getWindow().addEventListener49        .mock.calls[0];50      expect(addEventListenerArgs[2]).toEqual({ passive: true });51    });52    it('adds a popstate event listener when autoRestore option is omitted', function() {53      scrollRestorer.start();54      // We should have attached popstate and scroll event listeners.55      expect(56        getWindowModule.getWindow().addEventListener57      ).toHaveBeenCalledTimes(2);58      // Find the popstate addEventListener call.59      var popStateListenerCall = getWindowModule60        .getWindow()61        .addEventListener.mock.calls.filter(function(callArgs) {62          return callArgs[0] === 'popstate';63        });64      expect(popStateListenerCall.length).toBe(1);65    });66    it('does not add a popstate event listener when autoRestore option is false', function() {67      scrollRestorer.start({ autoRestore: false });68      // We should have attached only a scroll listener.69      expect(70        getWindowModule.getWindow().addEventListener71      ).toHaveBeenCalledTimes(1);72      // We should not have attached a popstate listener.73      var addEventListenerArgs = getWindowModule.getWindow().addEventListener74        .mock.calls[0];75      expect(addEventListenerArgs[0]).not.toBe('popstate');76    });77    it('sets history.scrollRestoration to manual if property exists', function() {78      expect(getWindowModule.getWindow().history.scrollRestoration).toEqual(79        'foo'80      );81      scrollRestorer.start();82      expect(getWindowModule.getWindow().history.scrollRestoration).toEqual(83        'manual'84      );85    });86    it('does not set history.scrollRestoration if property does not exists', function() {87      delete getWindowModule.getWindow().history.scrollRestoration;88      scrollRestorer.start();89      expect(getWindowModule.getWindow().history.scrollRestoration).toEqual(90        undefined91      );92    });93  });94  describe('captureScroll', function() {95    beforeEach(function() {96      jest.useFakeTimers();97    });98    afterEach(function() {99      jest.useRealTimers();100    });101    it('calls #replaceState if the saved offset values have changed', function() {102      // We're pretending that the user scrolled the window by 20px on both axes.103      getWindowModule.getWindow().pageXOffset = 20;104      getWindowModule.getWindow().pageYOffset = 20;105      scrollRestorer.start();106      var addEventListenerArgs = getWindowModule.getWindow().addEventListener107        .mock.calls[0];108      // Let's verify that this is the scroll event listener.109      expect(addEventListenerArgs[0]).toEqual('scroll');110      // Let's invoke the debounced event handler directly.111      addEventListenerArgs[1]();112      // We fake the passage of time to invoke our debounced function.113      jest.runAllTimers();114      // Assert that replaceState was invoked with the "new" scroll offset values.115      expect(116        getWindowModule.getWindow().history.replaceState117      ).toHaveBeenCalledWith(118        { scroll: { x: 20, y: 20 } },119        null,120        getWindowModule.getWindow().location121      );122    });123    it('does not call #replaceState if the saved offset values have not changed', function() {124      scrollRestorer.start();125      var addEventListenerArgs = getWindowModule.getWindow().addEventListener126        .mock.calls[0];127      // Let's verify that this is the scroll event listener.128      expect(addEventListenerArgs[0]).toEqual('scroll');129      // Let's invoke the debounced event handler directly.130      addEventListenerArgs[1]();131      // We fake the passage of time to invoke our debounced function.132      jest.runAllTimers();133      expect(134        getWindowModule.getWindow().history.replaceState135      ).not.toHaveBeenCalled();136    });137  });138  describe('getSavedScroll', function() {139    it('returns value from provided input', function() {140      expect(scrollRestorer.getSavedScroll({ state: { scroll: 'foo' } })).toBe(141        'foo'142      );143    });144    it('returns value from window.history when input is not defined', function() {145      expect(scrollRestorer.getSavedScroll()).toEqual({ x: 0, y: 0 });146    });147    it('returns undefined when input.state is undefined', function() {148      expect(scrollRestorer.getSavedScroll({ foo: 'bar' })).toEqual(undefined);149    });150  });151  describe('restoreScroll', function() {152    it('calls #scrollTo with a position retrieved from state in window.history', function() {153      // We're pretending that a scroll position has been saved previously.154      getWindowModule.getWindow().history.state.scroll = { x: 0, y: 20 };155      scrollRestorer.restoreScroll();156      expect(getWindowModule.getWindow().scrollTo).toHaveBeenCalledWith(0, 20);157    });158    it('calls #scrollTo with a position retrieved from a popstate event', function() {159      var popstateEvent = { state: { scroll: { x: 0, y: 40 } } };160      scrollRestorer.restoreScroll(popstateEvent);161      expect(getWindowModule.getWindow().scrollTo).toHaveBeenCalledWith(0, 40);162    });163    it('does not call #scrollTo when unnecessary', function() {164      // We're pretending that the user scrolled the window by 20px on the y axis.165      getWindowModule.getWindow().pageXOffset = 0;166      getWindowModule.getWindow().pageYOffset = 20;167      // We're pretending that the same scroll position has already been saved.168      getWindowModule.getWindow().history.state.scroll = { x: 0, y: 20 };169      scrollRestorer.start();170      scrollRestorer.restoreScroll();171      scrollRestorer.end();172      expect(getWindowModule.getWindow().scrollTo).not.toHaveBeenCalled();173    });174    it('returns early if no saved scroll positions exist', function() {175      getWindowModule.getWindow().requestAnimationFrame = jest.fn();176      scrollRestorer.restoreScroll({ foo: 'bar' });177      expect(178        getWindowModule.getWindow().requestAnimationFrame179      ).not.toHaveBeenCalled();180    });181  });182  describe('end', function() {183    it('removes the scroll event listener with identical arguments', function() {184      scrollRestorer.start();185      scrollRestorer.end();186      var addEventListenerArgs = getWindowModule.getWindow().addEventListener187        .mock.calls[0];188      var removeEventListenerArgs = getWindowModule.getWindow()189        .removeEventListener.mock.calls[0];190      // Let's verify that this is the scroll event listener.191      expect(addEventListenerArgs[0]).toEqual('scroll');192      // Let's verify that our handler function is === when adding and removing.193      expect(addEventListenerArgs[1]).toBe(removeEventListenerArgs[1]);194      expect(addEventListenerArgs).toEqual(removeEventListenerArgs);195    });196    it('removes the popstate event listener with identical arguments', function() {197      scrollRestorer.start({ autoRestore: true });198      scrollRestorer.end();199      var addEventListenerArgs = getWindowModule.getWindow().addEventListener200        .mock.calls[1];201      var removeEventListenerArgs = getWindowModule.getWindow()202        .removeEventListener.mock.calls[1];203      // Let's verify that this is the popstate event listener.204      expect(addEventListenerArgs[0]).toEqual('popstate');205      // Let's verify that our handler function is === when adding and removing.206      expect(addEventListenerArgs[1]).toBe(removeEventListenerArgs[1]);207      expect(addEventListenerArgs).toEqual(removeEventListenerArgs);208    });209  });...

ExifRestorer.js

Source:ExifRestorer.js

1//Based on MinifyJpeg2//http://elicon.blog57.fc2.com/blog-entry-206.html3qq.ExifRestorer = (function()4{5   6	var ExifRestorer = {};7	 8    ExifRestorer.KEY_STR = "ABCDEFGHIJKLMNOP" +9                         "QRSTUVWXYZabcdef" +10                         "ghijklmnopqrstuv" +11                         "wxyz0123456789+/" +12                         "=";13    ExifRestorer.encode64 = function(input)14    {15        var output = "",16            chr1, chr2, chr3 = "",17            enc1, enc2, enc3, enc4 = "",18            i = 0;19        do {20            chr1 = input[i++];21            chr2 = input[i++];22            chr3 = input[i++];23            enc1 = chr1 >> 2;24            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);25            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);26            enc4 = chr3 & 63;27            if (isNaN(chr2)) {28               enc3 = enc4 = 64;29            } else if (isNaN(chr3)) {30               enc4 = 64;31            }32            output = output +33               this.KEY_STR.charAt(enc1) +34               this.KEY_STR.charAt(enc2) +35               this.KEY_STR.charAt(enc3) +36               this.KEY_STR.charAt(enc4);37            chr1 = chr2 = chr3 = "";38            enc1 = enc2 = enc3 = enc4 = "";39        } while (i < input.length);40        return output;41    };42    43    ExifRestorer.restore = function(origFileBase64, resizedFileBase64)44    {45        var expectedBase64Header = "data:image/jpeg;base64,";46        if (!origFileBase64.match(expectedBase64Header))47        {48        	return resizedFileBase64;49        }       50        51        var rawImage = this.decode64(origFileBase64.replace(expectedBase64Header, ""));52        var segments = this.slice2Segments(rawImage);53                54        var image = this.exifManipulation(resizedFileBase64, segments);55        56        return expectedBase64Header + this.encode64(image);57        58    };59    ExifRestorer.exifManipulation = function(resizedFileBase64, segments)60    {61            var exifArray = this.getExifArray(segments),62                newImageArray = this.insertExif(resizedFileBase64, exifArray),63                aBuffer = new Uint8Array(newImageArray);64            return aBuffer;65    };66    ExifRestorer.getExifArray = function(segments)67    {68            var seg;69            for (var x = 0; x < segments.length; x++)70            {71                seg = segments[x];72                if (seg[0] == 255 & seg[1] == 225) //(ff e1)73                {74                    return seg;75                }76            }77            return [];78    };79    ExifRestorer.insertExif = function(resizedFileBase64, exifArray)80    {81            var imageData = resizedFileBase64.replace("data:image/jpeg;base64,", ""),82                buf = this.decode64(imageData),83                separatePoint = buf.indexOf(255,3),84                mae = buf.slice(0, separatePoint),85                ato = buf.slice(separatePoint),86                array = mae;87            array = array.concat(exifArray);88            array = array.concat(ato);89           return array;90    };91    92    ExifRestorer.slice2Segments = function(rawImageArray)93    {94        var head = 0,95            segments = [];96        while (1)97        {98            if (rawImageArray[head] == 255 & rawImageArray[head + 1] == 218){break;}99            if (rawImageArray[head] == 255 & rawImageArray[head + 1] == 216)100            {101                head += 2;102            }103            else104            {105                var length = rawImageArray[head + 2] * 256 + rawImageArray[head + 3],106                    endPoint = head + length + 2,107                    seg = rawImageArray.slice(head, endPoint);108                segments.push(seg);109                head = endPoint;110            }111            if (head > rawImageArray.length){break;}112        }113        return segments;114    };115    116    ExifRestorer.decode64 = function(input) 117    {118        var output = "",119            chr1, chr2, chr3 = "",120            enc1, enc2, enc3, enc4 = "",121            i = 0,122            buf = [];123        // remove all characters that are not A-Z, a-z, 0-9, +, /, or =124        var base64test = /[^A-Za-z0-9\+\/\=]/g;125        if (base64test.exec(input)) {126            throw new Error("There were invalid base64 characters in the input text.  " +127                "Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='");128        }129        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");130        do {131            enc1 = this.KEY_STR.indexOf(input.charAt(i++));132            enc2 = this.KEY_STR.indexOf(input.charAt(i++));133            enc3 = this.KEY_STR.indexOf(input.charAt(i++));134            enc4 = this.KEY_STR.indexOf(input.charAt(i++));135            chr1 = (enc1 << 2) | (enc2 >> 4);136            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);137            chr3 = ((enc3 & 3) << 6) | enc4;138            buf.push(chr1);139            if (enc3 != 64) {140               buf.push(chr2);141            }142            if (enc4 != 64) {143               buf.push(chr3);144            }145            chr1 = chr2 = chr3 = "";146            enc1 = enc2 = enc3 = enc4 = "";147        } while (i < input.length);148        return buf;149    };150    151    return ExifRestorer;...

restorer.js

Source:restorer.js

1"use strict";2/*3This file is part of the ONLINE WARBAND CREATOR (https://github.com/suppenhuhn79/sbhowc)4Copyright 2021 Christoph Zager5Licensed unter the GNU Affero General Public License, Version 36See the full license text at https://www.gnu.org/licenses/agpl-3.0.en.html7 */8var restorer = {};9restorer.sort =10{11	field: "last-modified",12	direction: 113};14restorer.show = function ()15{16	owc.ui.showBluebox(document.getElementById("restorer"));17	restorer.listStoredData();18};19restorer.close = () => owc.ui.sweepVolatiles();20restorer.getSelectedPid = function ()21{22	let selectedItem = document.getElementById("restorer-table-frame").querySelector(".selected");23	return (!!selectedItem) ? selectedItem.getAttribute("data-id") : null;24};25restorer.storageItemClick = function (clickEvent)26{27	let selectedItem = document.getElementById("restorer-table-frame").querySelector(".selected");28	if (!!selectedItem)29	{30		selectedItem.classList.remove("selected");31	};32	clickEvent.target.closest("tr[data-id]").classList.add("selected");33};34restorer.restoreClick = function (clickEvent)35{36	let selectedPid = restorer.getSelectedPid();37	if (!!selectedPid)38	{39		restorer.close();40		let warbandCode = JSON.parse(localStorage.getItem(selectedPid)).data;41		owc.importWarband(warbandCode);42		/* unselect everything in document, some browsers interpret a dblclk as intend to select anything */43		if (typeof window.getSelection === "function")44		{45			window.getSelection().removeAllRanges();46		}47		else if (typeof document.selection === "funtion")48		{49			document.selection.empty();50		};51	};52};53restorer.discardClick = function (clickEvent)54{55	clickEvent.stopPropagation();56	let selectedPid = restorer.getSelectedPid();57	if (!!selectedPid)58	{59		localStorage.removeItem(selectedPid);60		let deletedBubble = document.getElementById("deletedBubble");61		deletedBubble.style.left = Math.floor(document.querySelector("#restorer input[value=\"discard\"]").getBoundingClientRect().x - document.getElementById("restorer").getBoundingClientRect().x) + "px";62		owc.ui.showNotification(deletedBubble);63		restorer.listStoredData();64	};65};66restorer.tableheaderClick = function (clickEvent)67{68	let sortField = clickEvent.target.getAttribute("data-sortfield");69	if (restorer.sort.field === sortField)70	{71		restorer.sort.direction = restorer.sort.direction * -1;72	}73	else74	{75		restorer.sort.field = sortField;76		restorer.sort.direction = 1;77	};78	restorer.listStoredData();79};80restorer.listStoredData = function ()81{82	function _naturalPast(pastDate)83	{84		const wordings = ["just now", "{{n}} minutes ago", "{{6}} hours ago"];85		const dayWordings = ["today", "yesterday", "two days ago"];86		let result = "";87		let now = new Date();88		let maxHours = Number(/\{{2}(\d+)\}{2}/.exec(wordings[2])[1]);89		let secondsDiff = (now.getTime() - pastDate.getTime()) / 1000;90		let diff =91		{92			minutes: secondsDiff / 60,93			hours: secondsDiff / 60 / 60,94			days: Math.floor((Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()) - Date.UTC(pastDate.getFullYear(), pastDate.getMonth(), pastDate.getDate())) / (1000 * 60 * 60 * 24))95		};96		if (secondsDiff < 60)97		{98			result = wordings[0];99		}100		else if (diff.minutes < 60)101		{102			result = wordings[1].replace(/\{{2}.\}{2}/, Math.floor(diff.minutes));103		}104		else if (diff.hours < maxHours)105		{106			result = wordings[2].replace(/\{{2}.\}{2}/, Math.floor(diff.hours));107		}108		else if (diff.days < dayWordings.length)109		{110			result = dayWordings[diff.days] + " " + pastDate.toIsoFormatText("HN");111		}112		else113		{114			result = pastDate.toIsoFormatText();115		};116		return result;117	};118	function _getLocalStorageData()119	{120		let result = [];121		for (let key in localStorage)122		{123			if (/^(?=\D*\d)[\d\w]{6}$/.test(key) === true)124			{125				let storedData = JSON.parse(localStorage[key]);126				let lastModifiedDate = new Date().fromIsoString(storedData.date);127				result.push(128				{129					pid: key,130					'warband-name': storedData.title,131					'figure-count': storedData["figure-count"],132					points: storedData.points,133					'last-modified': lastModifiedDate,134					'last-modified-text': _naturalPast(lastModifiedDate)135				}136				);137			};138		};139		switch (restorer.sort.field)140		{141		case "warband-name":142			result.sort((a, b) => (a["warband-name"].localeCompare(b["warband-name"]) * restorer.sort.direction));143			break;144		default:145			result.sort((a, b) => (((a[restorer.sort.field] < b[restorer.sort.field]) ? 1 : -1) * restorer.sort.direction));146		};147		return result;148	};149	let refNode = document.getElementById("restorer-table-frame");150	let variables =151	{152		'cached-warbands': _getLocalStorageData()153	};154	const thresholdWidth = 400;155	let snippetName = (Number(document.body.clientWidth) <= thresholdWidth) ? "table-frame-small" : "table-frame-normal";156	owc.ui.setElementContent(refNode, pageSnippets.restorer[snippetName].produce(restorer, variables));...

Using AI Code Generation

1var sinon = require('sinon');2var assert = require('assert');3var myObj = {4    myMethod: function () {5        console.log('myMethod was called');6    }7};8var spy = sinon.spy(myObj, 'myMethod');9myObj.myMethod();10assert(spy.called);11spy.restore();12myObj.myMethod();13assert(!spy.called);

Using AI Code Generation

1var sinon = require('sinon');2var obj = {3    method: function () {}4};5var spy = sinon.spy(obj, "method");6obj.method(42);7obj.method.restore();8obj.method(42);

Using AI Code Generation

1var sinon = require('sinon');2var chai = require('chai');3var expect = chai.expect;4describe('Restorer', function () {5    it('should restore the stubbed method', function () {6        var stub = sinon.stub(console, 'log');7        console.log('hello');8        expect(stub.calledOnce).to.be.true;9        stub.restore();10        console.log('hello');11        expect(stub.calledTwice).to.be.false;12    });13});14var sinon = require('sinon');15var chai = require('chai');16var expect = chai.expect;17describe('Restorer', function () {18    it('should restore the stubbed method', function () {19        var stub = sinon.stub(console, 'log');20        console.log('hello');21        expect(stub.calledOnce).to.be.true;22        stub.restore();23        console.log('hello');24        expect(stub.calledTwice).to.be.false;25    });26});27var sinon = require('sinon');28var chai = require('chai');29var expect = chai.expect;30describe('Restorer', function () {31    it('should restore the stubbed method', function () {32        var stub = sinon.stub(console, 'log');33        console.log('hello');34        expect(stub.calledOnce).to.be.true;35        stub.restore();36        console.log('hello');37        expect(stub.calledTwice).to.be.false;38    });39});40var sinon = require('sinon');41var chai = require('chai');42var expect = chai.expect;43describe('Restorer', function () {44    it('should restore the stubbed method', function () {45        var stub = sinon.stub(console, 'log');46        console.log('hello');47        expect(stub.calledOnce).to.be.true;48        stub.restore();49        console.log('hello');50        expect(stub.calledTwice).to.be.false;51    });52});53var sinon = require('sinon');54var chai = require('chai');55var expect = chai.expect;56describe('Restorer', function () {57    it('should restore the stubbed method', function () {58        var stub = sinon.stub(console, 'log');59        console.log('

Using AI Code Generation

1var sinon = require('sinon');2var assert = require('assert');3var myObj = {4    method: function () {5        console.log("Method called");6    }7};8var stub = sinon.stub(myObj, "method");9stub();10stub.restore();11stub();12var sinon = require('sinon');13var assert = require('assert');14var myObj = {15    method: function () {16        console.log("Method called");17    }18};19var stub = sinon.stub(myObj, "method");20stub();21stub.restore();22stub();23var sinon = require('sinon');24var assert = require('assert');25var myObj = {26    method: function () {27        console.log("Method called");28    }29};30var stub = sinon.stub(myObj, "method");31stub();32stub.restore();33stub();34var sinon = require('sinon');35var assert = require('assert');36var myObj = {37    method: function () {38        console.log("Method called");39    }40};41var stub = sinon.stub(myObj, "method");42stub();43stub.restore();44stub();45var sinon = require('sinon');46var assert = require('assert');47var myObj = {48    method: function () {49        console.log("Method called");50    }51};52var stub = sinon.stub(myObj, "method");53stub();54stub.restore();55stub();56var sinon = require('sinon');57var assert = require('assert');58var myObj = {59    method: function () {60        console.log("Method called");61    }62};63var stub = sinon.stub(myObj, "method");64stub();65stub.restore();66stub();67var sinon = require('sinon');68var assert = require('assert');69var myObj = {70    method: function ()

Using AI Code Generation

1const sinon = require('sinon');2const fs = require('fs');3const readFile = sinon.stub(fs, 'readFile');4readFile.withArgs('hello.txt').yields(null, 'Hello');5readFile.withArgs('goodbye.txt').yields(null, 'Goodbye');6sinon.fake.restore();7const sinon = require('sinon');8const fs = require('fs');9const readFile = sinon.stub(fs, 'readFile');10readFile.withArgs('hello.txt').yields(null, 'Hello');11readFile.withArgs('goodbye.txt').yields(null, 'Goodbye');12sinon.fake.restore();13const sinon = require('sinon');14const fs = require('fs');15const readFile = sinon.stub(fs, 'readFile');16readFile.withArgs('hello.txt').yields(null, 'Hello');17readFile.withArgs('goodbye.txt').yields(null, 'Goodbye');18sinon.fake.restore();19const sinon = require('sinon');20const fs = require('fs');21const readFile = sinon.stub(fs, 'readFile');22readFile.withArgs('hello.txt').yields(null, 'Hello');23readFile.withArgs('goodbye.txt').yields(null, 'Goodbye');24sinon.fake.restore();25const sinon = require('sinon');26const fs = require('fs');27const readFile = sinon.stub(fs, 'readFile');28readFile.withArgs('hello.txt').yields(null, 'Hello');29readFile.withArgs('goodbye.txt').yields(null, 'Goodbye');30sinon.fake.restore();31const sinon = require('sinon');32const fs = require('fs');33const readFile = sinon.stub(fs, 'readFile');

Using AI Code Generation

1const sinon = require('sinon');2const assert = require('assert');3const {getUsers} = require('./user');4describe('getUsers', () => {5  it('should return users', () => {6    const stub = sinon.stub().returns([1, 2, 3]);7    const users = getUsers(stub);8    assert.deepEqual(users, [1, 2, 3]);9  });10  it('should call callback', () => {11    const stub = sinon.stub().returns([1, 2, 3]);12    getUsers(stub);13    assert(stub.calledOnce);14  });15});

Using AI Code Generation

1const sinon = require('sinon');2const assert = require('assert');3const { EventEmitter } = require('events');4const { once } = require('events');5const emitter = new EventEmitter();6const stub = sinon.stub().resolves(42);7emitter.on('foo', stub);8emitter.emit('foo', 'bar');9assert(stub.calledOnceWith('bar'));10const sinon = require('sinon');11const assert = require('assert');12const { EventEmitter } = require('events');13const { once } = require('events');14const emitter = new EventEmitter();15const stub = sinon.stub().resolves(42);16emitter.on('foo', stub);17emitter.emit('foo', 'bar');18assert(stub.calledOnceWith('bar'));19stub.restore();

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