KaneAI - World’s First E2E Software Testing Agent.Signup for Private Beta Join TestMu Conference

How to use ShouldReturnNullForNonExistingElement method of PuppeteerSharp.Tests.QuerySelectorTests.PageQuerySelectorTests class

Best Puppeteer-sharp code snippet using PuppeteerSharp.Tests.QuerySelectorTests.PageQuerySelectorTests.ShouldReturnNullForNonExistingElement

PageQuerySelectorTests.cs

Source:PageQuerySelectorTests.cs

...20            Assert.NotNull(element);21        }22        [PuppeteerTest("queryselector.spec.ts", "Page.$", "should query existing element")]23        [PuppeteerFact]24        public async Task ShouldReturnNullForNonExistingElement()25        {26            var element = await Page.QuerySelectorAsync("non-existing-element");27            Assert.Null(element);28        }29    }30}...

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1{2    [Collection("PuppeteerLoaderFixture collection")]3    {4        public async Task ShouldReturnNullForNonExistingElement()5        {6            await Page.GoToAsync(TestConstants.EmptyPage);7            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));8        }9    }10}11{12    [Collection("PuppeteerLoaderFixture collection")]13    {14        public async Task ShouldReturnNullForNonExistingElement()15        {16            await Page.GoToAsync(TestConstants.EmptyPage);17            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));18        }19    }20}21{22    [Collection("PuppeteerLoaderFixture collection")]23    {24        public async Task ShouldReturnNullForNonExistingElement()25        {26            await Page.GoToAsync(TestConstants.EmptyPage);27            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));28        }29    }30}31{32    [Collection("PuppeteerLoaderFixture collection")]33    {34        public async Task ShouldReturnNullForNonExistingElement()35        {36            await Page.GoToAsync(TestConstants.EmptyPage);37            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));38        }39    }40}41{

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.Linq;4using System.Text;5using System.Threading.Tasks;6using NUnit.Framework;7using PuppeteerSharp.Tests.Attributes;8{9    {10        public async Task ShouldQueryExistingElement()11        {12            await Page.GoToAsync(TestConstants.ServerUrl + "/playground.html");13            Assert.AreEqual("PLAYGROUND", await Page.QuerySelectorEvalAsync("h1", "x => x.id"));14        }15        public async Task ShouldReturnNullForNonExistingElement()16        {17            await Page.GoToAsync(TestConstants.ServerUrl + "/playground.html");18            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));19        }20        public async Task ShouldWorkWithRemovedMutation()21        {22            await Page.GoToAsync(TestConstants.ServerUrl + "/playground.html");23            await Page.EvaluateFunctionAsync("() => delete window['Node']");24            Assert.Null(await Page.QuerySelectorAsync("div"));25        }26        public async Task ShouldWorkWithShadowDom()27        {28            await Page.GoToAsync(TestConstants.ServerUrl + "/shadow.html");29            Assert.AreEqual("H1 in root", await Page.QuerySelectorEvalAsync("span >> css=div >> css=h1", "x => x.textContent"));30        }31        public async Task ShouldWorkWithShadowDomAndText()32        {33            await Page.GoToAsync(TestConstants.ServerUrl + "/shadow.html");34            Assert.AreEqual("H1 in root", await Page.QuerySelectorEvalAsync("css=div >> text=\"H1 in root\"", "x => x.textContent"));35        }36        public async Task ShouldWorkWithContentSlotted()37        {38            await Page.GoToAsync(TestConstants.ServerUrl + "/shadow.html");39            Assert.AreEqual("H1 in root", await Page.QuerySelectorEvalAsync("css=div >> css=section >> css=slot >> css=h1", "x => x.textContent"));40        }

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Xunit;4using PuppeteerSharp.Tests.Attributes;5using PuppeteerSharp.Xunit;6{7    [Collection(TestConstants.TestFixtureCollectionName)]8    {9        [PuppeteerTest("queryselector.spec.ts", "Page.$", "should return null for non-existing element")]10        public async Task ShouldReturnNullForNonExistingElement()11        {12            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));13        }14    }15}16using System;17using System.Threading.Tasks;18using Xunit;19using PuppeteerSharp.Tests.Attributes;20using PuppeteerSharp.Xunit;21{22    [Collection(TestConstants.TestFixtureCollectionName)]23    {24        [PuppeteerTest("queryselector.spec.ts", "Page.$", "should return the only element with matching selector")]25        public async Task ShouldReturnTheOnlyElementWithMatchingSelector()26        {27            await Page.SetContentAsync("<div>A</div><br/><div>B</div>");28            var element = await Page.QuerySelectorAsync("div");29            Assert.Equal("A", await Page.EvaluateFunctionAsync<string>("e => e.textContent", element));30        }31    }32}33using System;34using System.Threading.Tasks;35using Xunit;36using PuppeteerSharp.Tests.Attributes;37using PuppeteerSharp.Xunit;38{39    [Collection(TestConstants.TestFixtureCollectionName)]40    {41        [PuppeteerTest("queryselector.spec.ts", "Page.$", "should return the only element with matching xpath")]42        public async Task ShouldReturnTheOnlyElementWithMatchingXpath()43        {44            await Page.SetContentAsync("<div>A</div><br/><div>B</div>");45            var element = await Page.QuerySelectorAsync("./

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.Linq;4using System.Text;5using System.Threading.Tasks;6using PuppeteerSharp.Tests.QuerySelectorTests;7{8    {9        static void Main(string[] args)10        {11            var test = new PageQuerySelectorTests();12            test.ShouldReturnNullForNonExistingElement();13        }14    }15}16using System;17using System.Collections.Generic;18using System.Linq;19using System.Text;20using System.Threading.Tasks;21using PuppeteerSharp.Tests.QuerySelectorTests;22{23    {24        static void Main(string[] args)25        {26            var test = new PageQuerySelectorTests();27            test.ShouldReturnNullForNonExistingElement();28        }29    }30}31using System;32using System.Collections.Generic;33using System.Linq;34using System.Text;35using System.Threading.Tasks;36using PuppeteerSharp.Tests.QuerySelectorTests;37{38    {39        static void Main(string[] args)40        {41            var test = new PageQuerySelectorTests();42            test.ShouldReturnNullForNonExistingElement();43        }44    }45}46using System;47using System.Collections.Generic;48using System.Linq;49using System.Text;50using System.Threading.Tasks;51using PuppeteerSharp.Tests.QuerySelectorTests;52{53    {54        static void Main(string[] args)55        {56            var test = new PageQuerySelectorTests();57            test.ShouldReturnNullForNonExistingElement();58        }59    }60}61using System;62using System.Collections.Generic;63using System.Linq;

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Xunit;4{5    [Collection("PuppeteerLoaderFixture collection")]6    {7        public async Task ShouldReturnNullForNonExistingElement()8        {9            await Page.GoToAsync(TestConstants.ServerUrl + "/playground.html");10            Assert.Null(await Page.QuerySelectorAsync("non-existing-element"));11        }12    }13}14using System;15using System.Threading.Tasks;16using Xunit;17{18    [Collection("PuppeteerLoaderFixture collection")]19    {20        public async Task ShouldReturnTheOnlyElement()21        {22            await Page.GoToAsync(TestConstants.ServerUrl + "/playground.html");23            Assert.Equal("BUTTON", (await Page.QuerySelectorAsync("button")).TagName);24        }25    }26}27using System;28using System.Threading.Tasks;29using Xunit;30{31    [Collection("PuppeteerLoaderFixture collection")]32    {33        public async Task ShouldReturnTheOnlyElementInShadowDom()34        {35            await Page.GoToAsync(TestConstants.ServerUrl + "/shadow.html");36            Assert.Equal("PUPPETEER-SHADOW", (await Page.QuerySelectorAsync("section#inner")).TagName);37        }38    }39}40using System;41using System.Threading.Tasks;42using Xunit;43{44    [Collection("PuppeteerLoaderFixture collection")]

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using PuppeteerSharp;2using System;3using System.Threading.Tasks;4{5    public static async Task Main(string[] args)6    {7        await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);8        using (var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = false }))9        using (var page = await browser.NewPageAsync())10        {11            await page.QuerySelectorAsync("non-existing-element");12        }13    }14}15   at PuppeteerSharp.Page.QuerySelectorAsync(St

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.