Best JavaScript code snippet using jest
money.js
Source: money.js
1const formatter = require("btrz-formatter");2function getCurrencyValue(item, propName, providerPreferences, userOptions) {3 const defaultOptions = {4 prefix: "displayCurrency"5 };6 const options = Object.assign({}, defaultOptions, userOptions);7 const prefix = options.prefix;8 if (!propName || !prefix || typeof propName !== "string" || typeof prefix !== "string") {9 throw new Error("getCurrencyValue: propName and prefix must be strings");10 }11 if (providerPreferences.preferences.multiCurrency) {12 const prefixedPropName = propName.replace(/^./, "".concat(prefix).concat(propName[0].toUpperCase()));13 return item[prefixedPropName] || item[propName];14 }15 return item[propName];16}17function getCurrency(item, providerPreferences) {18 const baseCurrency = providerPreferences.preferences.supportedCurrencies[0];19 if (providerPreferences.preferences.multiCurrency) {20 return item && item.displayCurrency && item.displayCurrency.isocode ? item.displayCurrency : baseCurrency;21 }22 return baseCurrency;23}24function getCurrencySymbol(isocode) {25 const currencies = [26 {27 isocode: "USD",28 symbol: "$",29 printSymbol: true30 },31 {32 isocode: "AUD",33 symbol: "$",34 printSymbol: true35 },36 {37 isocode: "CAD",38 symbol: "$",39 printSymbol: true40 },41 {42 isocode: "EUR",43 symbol: "â¬",44 printSymbol: true45 },46 {47 isocode: "GBP",48 symbol: "£",49 printSymbol: true50 },51 {52 isocode: "NZD",53 symbol: "$",54 printSymbol: true55 },56 {57 isocode: "MXN",58 symbol: "$",59 printSymbol: true60 },61 {62 isocode: "HNL",63 symbol: "L",64 printSymbol: true65 },66 {67 isocode: "NIO",68 symbol: "C$",69 printSymbol: true70 },71 {72 isocode: "CRC",73 symbol: "â¡",74 printSymbol: false75 },76 {77 isocode: "GTQ",78 symbol: "Q",79 printSymbol: true80 },81 {82 isocode: "PAB",83 symbol: "B/.",84 printSymbol: true85 }86 ]87 const trimIsocode = isocode ? isocode.trim() : "";88 const curcy = currencies.find((cur) => {89 return cur.isocode === trimIsocode;90 });91 return curcy && curcy.printSymbol ? curcy.symbol : " ";92}93function MoneyReduce(engine) {94 this.registerTag("moneyReduce", {95 parse: function(tagToken, remainTokens) {96 const args = tagToken.args.split(" ");97 this.item = args[0] || "ticket.taxes";98 this.innerPropName = args[1] || "calculated";99 },100 render: async function(ctx) {101 const coll = await this.liquid.evalValue(this.item, ctx);102 if (ctx && ctx.environments && ctx.environments.providerPreferences && ctx.environments.providerPreferences.preferences &&103 Array.isArray(coll)) {104 const sum = coll.reduce((acc, item) => {105 return acc + getCurrencyValue(item, this.innerPropName, ctx.environments.providerPreferences, {prefix: "display"});106 }, 0);107 return formatter.money(sum);108 }109 return "PNA";110 }111 });112}113function Money(engine) {114 this.registerTag("money", {115 parse: function(tagToken, remainTokens) {116 const args = tagToken.args.split(" ");117 this.item = args[0] || "ticket.total";118 this.propName = args[1] || "total";119 },120 render: async function(ctx) {121 const item = await this.liquid.evalValue(this.item, ctx);122 if (ctx && ctx.environments && ctx.environments.providerPreferences && ctx.environments.providerPreferences.preferences &&123 item && item[this.propName] !== undefined) {124 return formatter.money(getCurrencyValue(item, this.propName, ctx.environments.providerPreferences, {prefix: "display"}));125 }126 return "PNA";127 }128 });129}130function CurcySymbol(engine) {131 this.registerTag("curcySymbol", {132 parse: function(tagToken, remainTokens) {133 this.item = tagToken.args || "ticket";134 },135 render: async function(ctx) {136 const item = await this.liquid.evalValue(this.item, ctx);137 if (ctx && ctx.environments && ctx.environments.providerPreferences && ctx.environments.providerPreferences.preferences && item) {138 const itemCurrency = getCurrency(item, ctx.environments.providerPreferences);139 return getCurrencySymbol((itemCurrency || {}).isocode || " ");140 }141 return "";142 }143 });144}145function CurcyIso(engine) {146 this.registerTag("curcyIso", {147 parse: function(tagToken, remainTokens) {148 this.item = tagToken.args || "ticket";149 },150 render: async function(ctx) {151 const item = await this.liquid.evalValue(this.item, ctx);152 if (ctx && ctx.environments && ctx.environments.providerPreferences && ctx.environments.providerPreferences.preferences && item) {153 const itemCurrency = getCurrency(item, ctx.environments.providerPreferences);154 return (itemCurrency || {}).isocode || " ";155 }156 return "";157 }158 });159}160function CurcyName(engine) {161 this.registerTag("curcyName", {162 parse: function(tagToken, remainTokens) {163 this.item = tagToken.args || "ticket";164 },165 render: async function(ctx) {166 const item = await this.liquid.evalValue(this.item, ctx);167 if (ctx && ctx.environments && ctx.environments.providerPreferences && ctx.environments.providerPreferences.preferences && item) {168 const itemCurrency = getCurrency(item, ctx.environments.providerPreferences);169 return ctx.environments.localizer.get((itemCurrency || {}).isocode || " ");170 }171 return "";172 }173 });174}175module.exports = {176 CurcyIso,177 CurcySymbol,178 CurcyName,179 Money,180 MoneyReduce...
calculator.js
Source: calculator.js
...31 <td id="equal">=</td>32 </tr>33 </table>34`35function printSymbol(e)36{ 37 let obj=e.target;38 if(result.innerHTML==0)39 {40 result.innerHTML=obj.innerHTML;41 }42 43 else44 {45 result.innerHTML=result.innerHTML+obj.innerHTML;46 }47}48let result=document.getElementById("result");49let num1=document.getElementById("num1");...
script.js
Source: script.js
...33 input.value = "";34 display.innerHTML = "";35 display.value = "";36 decimalBtn.disabled = false;37 printSymbol();38}39function operate(operator) {40 if (input.value == "") {41 op = operator;42 } else {43 display.value = op(parseFloat(input.value), parseFloat(display.value));44 display.innerHTML = display.value;45 input.value = "";46 input.innerHTML = "";47 }48 op = operator;49 decimalBtn.disabled = false; 50 printSymbol(op);51}52function identity(x) {53 return x = isNaN(x) ? 0 : x;54}55function result() {56 if (input.value == "") {57 display.value = op(parseFloat(display.value), parseFloat(display.value));58 display.innerHTML = display.value;59 60 } else if (op == divide && display.value == 0 || op == divide && input.value == 0) {61 display.innerHTML = "Is not possible to divide by 0";62 input.value = "";63 display.value = "";64 input.innerHTML = "";65 }else {66 display.value = op(parseFloat(input.value), parseFloat(display.value));67 display.innerHTML = display.value;68 input.value = "";69 input.innerHTML = "";70 }71 decimalBtn.disabled = false;72 printSymbol();73}74function printSymbol(operator) {75 switch (operator) {76 case add:77 symbol.innerHTML = "+";78 break;79 case substract:80 symbol.innerHTML = "-";81 break;82 case divide:83 symbol.innerHTML = "/";84 break;85 case multiply:86 symbol.innerHTML = "*";87 break;88 default:...
board.test.js
Source: board.test.js
...78 })79 })80 describe('printSymbol', () => {81 test('Print water', () => {82 let symbol = board.printSymbol(BOARD.WATER)83 expect(symbol).toEqual(' ')84 })85 test('Print hit', () => {86 let symbol = board.printSymbol(BOARD.HIT)87 expect(symbol).toEqual('âº')88 })89 test('Print miss', () => {90 let symbol = board.printSymbol(BOARD.MISS)91 expect(symbol).toEqual('â¼')92 })93 test('Print ship', () => {94 let symbol = board.printSymbol(BOARD.SHIP)95 expect(symbol).toEqual('S')96 })97 test('Print default', () => {98 let symbol = board.printSymbol(7)99 expect(symbol).toEqual(' ')100 })101 })...
plan.js
Source: plan.js
...16 return (17 <div className="step">18 <span className="farm">19 {" "}20 {printSymbol(step.farm.farmer, "ð¨âð¾")}{" "}21 {printSymbol(step.farm.geese, "ð¦")} {printSymbol(step.farm.corn, "ð½")}22 </span>23 <span className="river">24 {step.boat.direction === "farm" ? (25 <span className="direction">â</span>26 ) : (27 ""28 )}{" "}29 {printSymbol(step.boat.farmer, "ð¨âð¾")}{" "}30 {printSymbol(step.boat.geese, "ð¦")} {printSymbol(step.boat.corn, "ð½")}{" "}31 {step.boat.direction === "market" ? (32 <span className="direction">â</span>33 ) : (34 ""35 )}36 </span>37 <span className="market">38 {" "}39 {printSymbol(step.market.farmer, "ð¨âð¾")}{" "}40 {printSymbol(step.market.geese, "ð¦")}{" "}41 {printSymbol(step.market.corn, "ð½")}{" "}42 </span>43 </div>44 );45};46export const Plan = ({ data: { corn, geese } }) => {47 const [plan, setPlan] = useState();48 const [cost, setCost] = useState();49 useEffect(() => {50 const calculator = new FarmerCrossing();51 const calculatedPlan = calculator.calculateCrossingPlanForCornAndGeese({52 corn,53 geese,54 });55 setPlan(calculatedPlan);...
print-symbol.js
Source: print-symbol.js
...5 * assumes this.y is set appropriately6 * if symbol is a multichar string without a . (as in scripts.staccato) 1 symbol per char is assumed7 * not scaled if not in printgroup8 */9function printSymbol(renderer, x, offset, symbol, options) {10 // TODO-PER: what happened to scalex, and scaley? That might have been a bug introduced in refactoring11 var el;12 var ycorr;13 if (!symbol) return null;14 if (symbol.length > 1 && symbol.indexOf(".") < 0) {15 var groupClass = elementGroup.isInGroup() ? '' : options.klass // If this is already in a group then don't repeat the classes for the sub-group)16 renderer.paper.openGroup({"data-name": options.name, klass: groupClass});17 var dx = 0;18 for (var i = 0; i < symbol.length; i++) {19 var s = symbol.charAt(i);20 ycorr = glyphs.getYCorr(s);21 el = glyphs.printSymbol(x + dx, renderer.calcY(offset + ycorr), s, renderer.paper, {stroke: options.stroke, fill: options.fill});22 if (el) {23 if (i < symbol.length - 1)24 dx += kernSymbols(s, symbol.charAt(i + 1), glyphs.getSymbolWidth(s));25 } else {26 renderText(renderer, { x: x, y: renderer.y, text: "no symbol:" + symbol, type: "debugfont", klass: 'debug-msg', anchor: 'start'}, false);27 }28 }29 var g = renderer.paper.closeGroup();30 return g;31 } else {32 ycorr = glyphs.getYCorr(symbol);33 if (elementGroup.isInGroup()) {34 el = glyphs.printSymbol(x, renderer.calcY(offset + ycorr), symbol, renderer.paper, {"data-name": options.name});35 } else {36 el = glyphs.printSymbol(x, renderer.calcY(offset + ycorr), symbol, renderer.paper, {klass: options.klass, stroke: options.stroke, fill: options.fill, "data-name": options.name});37 }38 if (el) {39 return el;40 }41 renderText(renderer, { x: x, y: renderer.y, text: "no symbol:" + symbol, type: "debugfont", klass: 'debug-msg', anchor: 'start'}, false);42 return null;43 }44}45function kernSymbols(lastSymbol, thisSymbol, lastSymbolWidth) {46 // This is just some adjustments to make it look better.47 var width = lastSymbolWidth;48 if (lastSymbol === 'f' && thisSymbol === 'f')49 width = width*2/3;50 if (lastSymbol === 'p' && thisSymbol === 'p')...
homework_2_task_1_pyramid.js
Source: homework_2_task_1_pyramid.js
1const readline = require('readline');2const checkHeight = readline.createInterface({3 input: process.stdin,4 output: process.stdout,5});6checkHeight.question('Enter height of pyramid: ', (height) => {7 checkHeight.close();8 if (!Number.isNaN(height)) {9 const emptiness = ' ';10 const symbol = '#';11 let amountEmptiness = 50;12 let amountSymbol = 2;13 for (let i = 0; i < height; i++) {14 amountSymbol += 2;15 amountEmptiness--;16 const printSymbol = symbol.repeat(amountSymbol);17 const printEmptiness = emptiness.repeat(amountEmptiness);18 console.log(printEmptiness + printSymbol);19 }20 } else {21 console.log('Please, enter a height of pyramid. It must be a number. For example: 15');22 }...
Fun-ction.js
Source: Fun-ction.js
1const rls = require("readline-sync");2const number1 = parseInt(rls.question("Enter your first number: "));3const number2 = parseInt(rls.question("Enter your second number: "));4const symbol = "-";5console.log(printSymbol(symbol, 22));6console.log("| SUMULATOR! |");7console.log(printSymbol(symbol, 22));8console.log("| THE SUM IS |");9console.log("| " + addNums(number1, number2) + " |");10console.log(printSymbol(symbol, 22));11function printSymbol(symbol, manyTime) {12 let symbolMsg = "";13 for (let i = 0; i < manyTime; i++) {14 symbolMsg += symbol;15 }16 return symbolMsg;17}18function addNums(num1, num2) {19 return num1 + num2;...
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Since Jest tests are runtime tests, they only have access to runtime information. You're trying to use a type, which is compile-time information. TypeScript should already be doing the type aspect of this for you. (More on that in a moment.)
The fact the tests only have access to runtime information has a couple of ramifications:
If it's valid for getAll
to return an empty array (because there aren't any entities to get), the test cannot tell you whether the array would have had Entity
elements in it if it hadn't been empty. All it can tell you is it got an array.
In the non-empty case, you have to check every element of the array to see if it's an Entity
. You've said Entity
is a class, not just a type, so that's possible. I'm not a user of Jest (I should be), but it doesn't seem to have a test specifically for this; it does have toBeTruthy
, though, and we can use every
to tell us if every element is an Entity
:
it('should return an array of Entity class', async () => {
const all = await service.getAll()
expect(all.every(e => e instanceof Entity)).toBeTruthy();
});
Beware, though, that all calls to every
on an empty array return true
, so again, that empty array issue raises its head.
If your Jest tests are written in TypeScript, you can improve on that by ensuring TypeScript tests the compile-time type of getAll
's return value:
it('should return an array of Entity class', async () => {
const all: Entity[] = await service.getAll()
// ^^^^^^^^^^
expect(all.every(e => e instanceof Entity)).toBeTruthy();
});
TypeScript will complain about that assignment at compile time if it's not valid, and Jest will complain at runtime if it sees an array containing a non-Entity
object.
But jonrsharpe has a good point: This test may not be useful vs. testing for specific values that should be there.
Check out the latest blogs from LambdaTest on this topic:
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|<p>it('check_object_of_Car', () => {</p><p>
expect(newCar()).toBeInstanceOf(Car);</p><p>
});</p>|
| :- |
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