KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use PageAssertions class of Microsoft.Playwright.Core package

Best Playwright-dotnet code snippet using Microsoft.Playwright.Core.PageAssertions

PageAssertions.cs

Source:PageAssertions.cs

...26using System.Threading.Tasks;27using Microsoft.Playwright.Transport.Protocol;28namespace Microsoft.Playwright.Core29{30    internal class PageAssertions : AssertionsBase, IPageAssertions31    {32        private readonly Page _page;33        public PageAssertions(IPage page, bool isNot) : base(PassThroughNonNull(page).Locator(":root"), isNot)34        {35            _page = (Page)page;36        }37        public IPageAssertions Not => new PageAssertions(_page, !IsNot);38        private static T PassThroughNonNull<T>(T value)39        {40            if (value == null)41            {42                throw new ArgumentNullException(nameof(value));43            }44            return value;45        }46        public Task ToHaveTitleAsync(string titleOrRegExp, PageAssertionsToHaveTitleOptions options = null) =>47            ExpectImplAsync("to.have.title", new ExpectedTextValue() { String = titleOrRegExp, NormalizeWhiteSpace = true }, titleOrRegExp, "Page title expected to be", ConvertToFrameExpectOptions(options));48        public Task ToHaveTitleAsync(Regex titleOrRegExp, PageAssertionsToHaveTitleOptions options = null) =>49            ExpectImplAsync("to.have.title", ExpectedRegex(titleOrRegExp, new() { NormalizeWhiteSpace = true }), titleOrRegExp, "Page title expected to be", ConvertToFrameExpectOptions(options));50        public Task ToHaveURLAsync(string urlOrRegExp, PageAssertionsToHaveURLOptions options = null) =>51            ExpectImplAsync("to.have.url", new ExpectedTextValue() { String = _page.Context.CombineUrlWithBase(urlOrRegExp) }, urlOrRegExp, "Page URL expected to be", ConvertToFrameExpectOptions(options));52        public Task ToHaveURLAsync(Regex urlOrRegExp, PageAssertionsToHaveURLOptions options = null) =>53            ExpectImplAsync("to.have.url", ExpectedRegex(urlOrRegExp), urlOrRegExp, "Page URL expected to match regex", ConvertToFrameExpectOptions(options));54    }55}

Assertions.cs

Source:Assertions.cs

...3{4    public static class Assertions5    {6        public static ILocatorAssertions Expect(ILocator locator) => new LocatorAssertions(locator, false);7        public static IPageAssertions Expect(IPage page) => new PageAssertions(page, false);8    }9}...

PageAssertions

Using AI Code Generation

1var playwright = await Playwright.CreateAsync();2var browser = await playwright.Chromium.LaunchAsync(headless: false);3var context = await browser.NewContextAsync();4var page = await context.NewPageAsync();5await page.FillAsync("input[title='Search']", "Hello World");6await page.ClickAsync("text=Google Search");7await page.WaitForNavigationAsync();8await page.AssertSelectorAsync("text=Hello World");9await browser.CloseAsync();10using System;11using System.Threading.Tasks;12using Microsoft.Playwright;13{14    {15        static async Task Main(string[] args)16        {17            var playwright = await Playwright.CreateAsync();18            var browser = await playwright.Chromium.LaunchAsync(headless: false);19            var context = await browser.NewContextAsync();20            var page = await context.NewPageAsync();21            await page.FillAsync("input[title='Search']", "Hello World");22            await page.ClickAsync("text=Google Search");23            await page.WaitForNavigationAsync();24            await page.AssertSelectorAsync("text=Hello World");25            await browser.CloseAsync();26        }27    }28}29using System;30using System.Threading.Tasks;31using Microsoft.Playwright;32{33    {34        static async Task Main(string[] args)35        {36            var playwright = await Playwright.CreateAsync();37            var browser = await playwright.Chromium.LaunchAsync(headless: false);

PageAssertions

Using AI Code Generation

1using Microsoft.Playwright;2using Microsoft.Playwright.Core;3{4    static async Task Main(string[] args)5    {6        var playwright = await Playwright.CreateAsync();7        var browser = await playwright.Chromium.LaunchAsync();8        var context = await browser.NewContextAsync();9        var page = await context.NewPageAsync();10        var pageAssertions = new PageAssertions(page);11        await pageAssertions.HaveTitleAsync("Example Domain");12    }13}14using Microsoft.Playwright;15{16    static async Task Main(string[] args)17    {18        var playwright = await Playwright.CreateAsync();19        var browser = await playwright.Chromium.LaunchAsync();20        var context = await browser.NewContextAsync();21        var page = await context.NewPageAsync();22        var pageAssertions = new PageAssertions(page);23        await pageAssertions.HaveTitleAsync("Example Domain");24    }25}26using Microsoft.Playwright;27{28    static async Task Main(string[] args)29    {30        var playwright = await Playwright.CreateAsync();31        var browser = await playwright.Chromium.LaunchAsync();32        var context = await browser.NewContextAsync();33        var page = await context.NewPageAsync();34        var pageAssertions = new PageAssertions(page);35        await pageAssertions.HaveTitleAsync("Example Domain");36    }37}38using Microsoft.Playwright;39{40    static async Task Main(string[] args)41    {42        var playwright = await Playwright.CreateAsync();43        var browser = await playwright.Chromium.LaunchAsync();44        var context = await browser.NewContextAsync();45        var page = await context.NewPageAsync();46        var pageAssertions = new PageAssertions(page);47        await pageAssertions.HaveTitleAsync("Example Domain");48    }49}50using Microsoft.Playwright;51{

PageAssertions

Using AI Code Generation

1using Microsoft.Playwright;2using Microsoft.Playwright.Core;3using Microsoft.Playwright.Helpers;4using NUnit.Framework;5using System;6using System.Collections.Generic;7using System.Linq;8using System.Text;9using System.Threading.Tasks;10{11    {12        private IPlaywright _playwright;13        private IBrowser _browser;14        private IBrowserContext _context;15        private IPage _page;16        private PageAssertions _assert;17        public async Task Setup()18        {19            _playwright = await Playwright.CreateAsync();20            _browser = await _playwright.Chromium.LaunchAsync(new BrowserTypeLaunchOptions21            {22            });23            _context = await _browser.NewContextAsync(new BrowserNewContextOptions24            {25                Viewport = new ViewportSize { Width = 1920, Height = 1080 },26                Geolocation = new Geolocation { Longitude = 12.492507, Latitude = 41.889938 },27                Permissions = new[] { "geolocation" }28            });29            _page = await _context.NewPageAsync();30            _assert = new PageAssertions(_page);31        }32        public async Task Test1()33        {34            await _page.FillAsync("input[name='q']", "playwright");35            await _page.PressAsync("input[name='q']", "Enter");36            await _page.WaitForLoadStateAsync(LoadState.Load);37            await _page.WaitForSelectorAsync("text=Playwright");38            await _page.ClickAsync("text=Playwright");39            await _page.WaitForLoadStateAsync(LoadState.Load);40            await _page.WaitForSelectorAsync("text=Playwright is a Node library to automate Chromium, Firefox and WebKit with a single API.");41            await _assert.HasTextAsync("text=Playwright is a Node library to automate Chromium, Firefox and WebKit with a single API.");42        }43        public async Task TearDown()44        {45            await _browser.CloseAsync();46            await _playwright.StopAsync();47        }48    }49}

PageAssertions

Using AI Code Generation

1using Microsoft.Playwright;2using System.Threading.Tasks;3{4    {5        private readonly IPage _page;6        public PageAssertions(IPage page)7        {8            _page = page;9        }10        public async Task HasTextContentAsync(string text, string selector, string? message = null)11        {12            var element = await _page.QuerySelectorAsync(selector);13            var content = await element.GetTextContentAsync();14            if (content != text)15            {16                throw new PlaywrightAssertionException(message ?? $"Expected the element \"{selector}\" to contain the text \"{text}\", but found \"{content}\" instead.");17            }18        }19    }20}21using Microsoft.Playwright;22using System.Threading.Tasks;23{24    {25        private readonly IPage _page;26        public PageAssertions(IPage page)27        {28            _page = page;29        }30        public async Task HasTextContentAsync(string text, string selector, string? message = null)31        {32            var element = await _page.QuerySelectorAsync(selector);33            var content = await element.GetTextContentAsync();34            if (content != text)35            {36                throw new PlaywrightAssertionException(message ?? $"Expected the element \"{selector}\" to contain the text \"{text}\", but found \"{content}\" instead.");37            }38        }39    }40}41I have a problem with the following code: The error message is as follows: 'IPage' does not contain a definition for 'HasTextContent' and no accessible extension method 'HasTextContent' accepting a first argument of type 'IPage' could be found (are you missing a using directive or an assembly reference?)'. I have tried to add the following code to the top of the class, but it doesn't work: using Microsoft.Playwright; using Microsoft.Playwright.Core; using Microsoft.Playwright.NUnit; using Microsoft.Playwright.Testing; using Microsoft.Playwright.Testing.Xunit; using Microsoft.Playwright.Testing.Xunit.Attributes; using Microsoft.Playwright.Testing.Xunit.Extensions; using Microsoft.Playwright.Testing.Xunit.Internal.Attributes; using Microsoft.Playwright.Testing.Xunit.Internal.Extensions; using Microsoft.Playwright.Xunit; using Microsoft.Playwright.Xunit.Attributes; using Microsoft.Playwright.Xunit.Extensions; using Microsoft.Playwright.Xunit.Internal.Attributes

PageAssertions

Using AI Code Generation

1using Microsoft.Playwright.Core;2using Microsoft.Playwright.Core.Tests;3using Microsoft.Playwright;4using Microsoft.Playwright.Helpers;5using Microsoft.Playwright.Tests;6using NUnit.Framework;7using System;8using System.Collections.Generic;9using System.Diagnostics;10using System.Linq;11using System.Text;12using System.Threading.Tasks;13{14    {15        [PlaywrightTest("page-assertions.spec.ts", "should throw if selector does not exist")]16        [Test, Timeout(TestConstants.DefaultTestTimeout)]17        public async Task ShouldThrowIfSelectorDoesNotExist()18        {19            var exception = await PlaywrightAssert.ThrowsAsync<PlaywrightException>(async () => await Page.AssertSelectorAsync(".zombo"));20            StringAssert.Contains("expected selector .zombo to exist", exception.Message);21        }22        [PlaywrightTest("page-assertions.spec.ts", "should throw if selector exists")]23        [Test, Timeout(TestConstants.DefaultTestTimeout)]24        public async Task ShouldThrowIfSelectorExists()25        {26            await Page.SetContentAsync("<html><body><div class=\"zombo\"></div></body></html>");27            var exception = await PlaywrightAssert.ThrowsAsync<PlaywrightException>(async () => await Page.AssertNoSelectorAsync(".zombo"));28            StringAssert.Contains("expected selector .zombo not to exist", exception.Message);29        }30        [PlaywrightTest("page-assertions.spec.ts", "should throw if text does not exist")]31        [Test, Timeout(TestConstants.DefaultTestTimeout)]32        public async Task ShouldThrowIfTextDoesNotExist()33        {34            await Page.SetContentAsync("<html><body><div class=\"zombo\">anything</div></body></html>");35            var exception = await PlaywrightAssert.ThrowsAsync<PlaywrightException>(async () => await Page.AssertSelectorAsync(":text(\"nothing\")"));36            StringAssert.Contains("expected selector :text(\"nothing\") to exist", exception.Message);37        }38        [PlaywrightTest("page-assertions.spec.ts", "should throw if text exists")]39        [Test, Timeout(TestConstants.DefaultTestTimeout)]40        public async Task ShouldThrowIfTextExists()41        {42            await Page.SetContentAsync("<html><body><div class=\"zombo\">anything</div></body></html>");43            var exception = await PlaywrightAssert.ThrowsAsync<PlaywrightException>(async () => await Page.AssertNoSelectorAsync(":text(\"

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
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.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.