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How to use ShouldReturnNullForNonExistingElement method of Microsoft.Playwright.Tests.ElementHandleQuerySelectorTests class

Best Playwright-dotnet code snippet using Microsoft.Playwright.Tests.ElementHandleQuerySelectorTests.ShouldReturnNullForNonExistingElement

ElementHandleQuerySelectorTests.cs

Source:ElementHandleQuerySelectorTests.cs

...40            string content = await Page.EvaluateAsync<string>("e => e.textContent", inner);41            Assert.AreEqual("A", content);42        }43        [PlaywrightTest("elementhandle-query-selector.spec.ts", "should return null for non-existing element")]44        public async Task ShouldReturnNullForNonExistingElement()45        {46            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">B</div></div></body></html>");47            var html = await Page.QuerySelectorAsync("html");48            var second = await html.QuerySelectorAsync(".third");49            Assert.Null(second);50        }51        [PlaywrightTest("elementhandle-query-selector.spec.ts", "should work for adopted elements")]52        public async Task ShouldWorkForAdoptedElements()53        {54            await Page.GotoAsync(Server.EmptyPage);55            var (popup, _) = await TaskUtils.WhenAll(56                Page.WaitForPopupAsync(),57                Page.EvaluateAsync("url => window.__popup = window.open(url)", Server.EmptyPage));58            var divHandle = await Page.EvaluateHandleAsync(@"() => {59                const div = document.createElement('div');60                document.body.appendChild(div);61                const span = document.createElement('span');62                span.textContent = 'hello';63                div.appendChild(span);64                return div;65            }") as IElementHandle;66            Assert.NotNull(divHandle);67            Assert.AreEqual("hello", await divHandle.EvalOnSelectorAsync<string>("span", "e => e.textContent"));68            await popup.WaitForLoadStateAsync(LoadState.DOMContentLoaded);69            await Page.EvaluateAsync(@"() => {70              const div = document.querySelector('div');71              window.__popup.document.body.appendChild(div);72            }");73            Assert.NotNull(await divHandle.QuerySelectorAsync("span"));74            Assert.AreEqual("hello", await divHandle.EvalOnSelectorAsync<string>("span", "e => e.textContent"));75        }76        [PlaywrightTest("elementhandle-query-selector.spec.ts", "should query existing elements")]77        public async Task ShouldQueryExistingElements()78        {79            await Page.SetContentAsync("<html><body><div>A</div><br/><div>B</div></body></html>");80            var html = await Page.QuerySelectorAsync("html");81            var elements = await html.QuerySelectorAllAsync("div");82            Assert.AreEqual(2, elements.Count());83            var tasks = elements.Select(element => Page.EvaluateAsync<string>("e => e.textContent", element));84            Assert.AreEqual(new[] { "A", "B" }, await TaskUtils.WhenAll(tasks));85        }86        [PlaywrightTest("elementhandle-query-selector.spec.ts", "should return empty array for non-existing elements")]87        public async Task ShouldReturnEmptyArrayForNonExistingElements()88        {89            await Page.SetContentAsync("<html><body><span>A</span><br/><span>B</span></body></html>");90            var html = await Page.QuerySelectorAsync("html");91            var elements = await html.QuerySelectorAllAsync("div");92            Assert.IsEmpty(elements);93        }94        [PlaywrightTest("elementhandle-query-selector.spec.ts", "xpath should query existing element")]95        public async Task XPathShouldQueryExistingElement()96        {97            await Page.GotoAsync(Server.Prefix + "/playground.html");98            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">A</div></div></body></html>");99            var html = await Page.QuerySelectorAsync("html");100            var second = await html.QuerySelectorAllAsync("xpath=./body/div[contains(@class, 'second')]");101            var inner = await second.First().QuerySelectorAllAsync("xpath=./div[contains(@class, 'inner')]");102            string content = await Page.EvaluateAsync<string>("e => e.textContent", inner.First());103            Assert.AreEqual("A", content);104        }105        [PlaywrightTest("elementhandle-query-selector.spec.ts", "xpath should return null for non-existing element")]106        public async Task XPathShouldReturnNullForNonExistingElement()107        {108            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">B</div></div></body></html>");109            var html = await Page.QuerySelectorAsync("html");110            var second = await html.QuerySelectorAllAsync("xpath=/div[contains(@class, 'third')]");111            Assert.IsEmpty(second);112        }113    }114}...

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1{2    using System.Threading.Tasks;3    using NUnit.Framework;4    using NUnit.Framework.Interfaces;5    {6        [PlaywrightTest("elementhandle-query-selector.spec.ts", "should return null for non-existing element")]7        [Test, Timeout(TestConstants.DefaultTestTimeout)]8        public async Task ShouldReturnNullForNonExistingElement()9        {10            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">A</div></div></body></html>");11            var html = await Page.QuerySelectorAsync("html");12            var second = await html.QuerySelectorAsync(".second");13            var third = await second.QuerySelectorAsync(".third");14            Assert.Null(third);15        }16    }17}

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using Microsoft.Playwright.Tests;2using Microsoft.Playwright.Tests.BaseTests;3using NUnit.Framework;4using System;5using System.Collections.Generic;6using System.Linq;7using System.Text;8using System.Threading.Tasks;9{10    [Parallelizable(ParallelScope.Self)]11    {12        [PlaywrightTest("elementhandle-queryselector.spec.ts", "should return null for non-existing element")]13        [Test, Timeout(TestConstants.DefaultTestTimeout)]14        public async Task ShouldReturnNullForNonExistingElement()15        {16            await Page.SetContentAsync("<html><body><div>A</div></body></html>");17            var html = await Page.QuerySelectorAsync("html");18            var nonExisting = await html.QuerySelectorAsync("non-existing-element");19            Assert.Null(nonExisting);20        }21    }22}23using Microsoft.Playwright.Tests;24using Microsoft.Playwright.Tests.BaseTests;25using NUnit.Framework;26using System;27using System.Collections.Generic;28using System.Linq;29using System.Text;30using System.Threading.Tasks;31{32    [Parallelizable(ParallelScope.Self)]33    {34        [PlaywrightTest("elementhandle-queryselector.spec.ts", "should return element handle for text nodes")]35        [Test, Timeout(TestConstants.DefaultTestTimeout)]36        public async Task ShouldReturnElementHandleForTextNodes()37        {38            await Page.SetContentAsync("<html><body><div>A</div></body></html>");39            var html = await Page.QuerySelectorAsync("html");40            Assert.NotNull(text);41        }42    }43}44using Microsoft.Playwright.Tests;45using Microsoft.Playwright.Tests.BaseTests;46using NUnit.Framework;47using System;48using System.Collections.Generic;49using System.Linq;50using System.Text;51using System.Threading.Tasks;52{53    [Parallelizable(ParallelScope.Self)]54    {

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4using Microsoft.Playwright.Tests;5{6    {7        static async Task Main(string[] args)8        {9            var playwright = await Playwright.CreateAsync();10            var browser = await playwright.Firefox.LaunchAsync(new BrowserTypeLaunchOptions11            {12            });13            var context = await browser.NewContextAsync();14            var page = await context.NewPageAsync();15            var elementHandle = await page.QuerySelectorAsync("nonexisting");16            var result = await ElementHandleQuerySelectorTests.ShouldReturnNullForNonExistingElement(elementHandle);17            Console.WriteLine(result);18            await browser.CloseAsync();19        }20    }21}

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Linq;3using System.Collections.Generic;4using Microsoft.Playwright.Tests;5{6    {7        static void Main(string[] args)8        {9            var test = new Microsoft.Playwright.Tests.ElementHandleQuerySelectorTests();10            test.Setup();11            test.ShouldReturnNullForNonExistingElement();12            test.Teardown();13        }14    }15}16using System;17using System.Linq;18using System.Collections.Generic;19using Microsoft.Playwright.Tests;20{21    {22        static void Main(string[] args)23        {24            var test = new Microsoft.Playwright.Tests.ElementHandleQuerySelectorTests();25            test.Setup();26            test.ShouldReturnNullForNonExistingElement();27            test.Teardown();28        }29    }30}

ShouldReturnNullForNonExistingElement

Using AI Code Generation

1using System;2using System.Collections.Generic;3using System.Linq;4using System.Text;5using System.Threading.Tasks;6using Microsoft.Playwright;7using Microsoft.Playwright.Transport;8using Microsoft.Playwright.Transport.Channels;9using Microsoft.Playwright.Transport.Protocol;10using Microsoft.Playwright.Tests.BaseTests;11using Xunit;12using Xunit.Abstractions;13{14    {15        public ElementHandleQuerySelectorTests(ITestOutputHelper output) : base(output)16        {17        }18        [PlaywrightTest("elementhandle-queryselector.spec.ts", "should return null for non-existing element")]19        [Fact(Timeout = PlaywrightSharp.Playwright.DefaultTimeout)]20        public async Task ShouldReturnNullForNonExistingElement()21        {22            await Page.SetContentAsync("<html><body><div class=\"second\"><div class=\"inner\">A</div></div></body></html>");23            var html = await Page.QuerySelectorAsync("html");24            var second = await html.QuerySelectorAsync(".third");25            Assert.Null(second);26        }27    }28}

Playwright tutorial

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Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
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