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

How to use UnobservedTaskException method of Microsoft.Playwright.Tests.PlaywrightTestAttribute class

Best Playwright-dotnet code snippet using Microsoft.Playwright.Tests.PlaywrightTestAttribute.UnobservedTaskException

PlaywrightTestAttribute.cs

Source:PlaywrightTestAttribute.cs

...77        /// The describe of the test, the decorated code is based on, if one exists.78        /// </summary>79        public string Describe { get; }80        /// <summary>81        /// Wraps the current test command in a <see cref="UnobservedTaskExceptionCommand"/>.82        /// </summary>83        /// <param name="command">the test command</param>84        /// <returns>the wrapped test command</returns>85        public TestCommand Wrap(TestCommand command)86            => new UnobservedTaskExceptionCommand(command);87        /// <summary>88        /// Helper to detect UnobservedTaskExceptions89        /// </summary>90        private sealed class UnobservedTaskExceptionCommand : DelegatingTestCommand91        {92            public UnobservedTaskExceptionCommand(TestCommand innerCommand)93                : base(innerCommand)94            {95            }96            private readonly List<Exception> _unobservedTaskExceptions = new();97            public override TestResult Execute(TestExecutionContext context)98            {99                TaskScheduler.UnobservedTaskException += UnobservedTaskException;100                TestResult result = null;101                try102                {103                    result = innerCommand.Execute(context);104                }105                finally106                {107                    // force a GC and wait for finalizers of (among other things) Tasks108                    // for which the UnobservedTaskException is raised if the task.Exception was not observed 109                    GC.Collect();110                    GC.WaitForPendingFinalizers();111                    TaskScheduler.UnobservedTaskException -= UnobservedTaskException;112                    if (_unobservedTaskExceptions.Count > 0)113                    {114                        result.RecordTearDownException(new AggregateException(_unobservedTaskExceptions));115                        _unobservedTaskExceptions.Clear();116                    }117                }118                return result;119            }120            private void UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)121            {122                _unobservedTaskExceptions.Add(e.Exception);123            }124        }125    }126}...

UnobservedTaskException

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright.Tests.Attributes;4using NUnit.Framework;5{6    {7        [PlaywrightTest("unobservedtaskexception.spec.ts", "should log unobserved error")]8        public async Task ShouldLogUnobservedError()9        {10            var exception = new Exception("dummy");11            var task = new Task(() => throw exception);12            task.Start();13            await Task.Delay(100);14            Assert.AreEqual(exception, PlaywrightTestAttribute.UnobservedTaskException);15        }16    }17}18using System;19using System.Threading.Tasks;20using Microsoft.Playwright.Tests.Attributes;21using NUnit.Framework;22{23    {24        [PlaywrightTest("unobservedtaskexception.spec.ts", "should log unobserved error")]25        public async Task ShouldLogUnobservedError()26        {27            var exception = new Exception("dummy");28            var task = new Task(() => throw exception);29            task.Start();30            await Task.Delay(100);31            Assert.AreEqual(exception, PlaywrightTestAttribute.UnobservedTaskException);32        }33    }34}35using System;36using System.Threading.Tasks;37using Microsoft.Playwright.Tests.Attributes;38using NUnit.Framework;39{40    {41        [PlaywrightTest("unobservedtaskexception.spec.ts", "should log unobserved error")]42        public async Task ShouldLogUnobservedError()43        {44            var exception = new Exception("dummy");45            var task = new Task(() => throw exception);46            task.Start();47            await Task.Delay(100);48            Assert.AreEqual(exception, PlaywrightTestAttribute.UnobservedTaskException);49        }50    }51}52using System;53using System.Threading.Tasks;54using Microsoft.Playwright.Tests.Attributes;55using NUnit.Framework;56{

UnobservedTaskException

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4using Microsoft.Playwright.Tests;5using NUnit.Framework;6using NUnit.Framework.Interfaces;7using NUnit.Framework.Internal;8using NUnit.Framework.Internal.Commands;9{10    {11        private readonly string _testName;12        public PlaywrightTestAttribute(string testName)13        {14            _testName = testName;15        }16        public TestCommand Wrap(TestCommand command)17        {18            return new PlaywrightTestCommand(command, _testName);19        }20    }21    {22        private readonly string _testName;23        public PlaywrightTestCommand(TestCommand innerCommand, string testName) : base(innerCommand)24        {25            _testName = testName;26        }27        public override TestResult Execute(TestExecutionContext context)28        {29            TaskScheduler.UnobservedTaskException += (sender, args) =>30            {31                Console.WriteLine("Unobserved Task Exception: " + args.Exception);32                args.SetObserved();33            };34            return base.Execute(context);35        }36    }37}38using System;39using System.Threading.Tasks;40using Microsoft.Playwright;41using Microsoft.Playwright.Tests;42using NUnit.Framework;43using NUnit.Framework.Interfaces;44using NUnit.Framework.Internal;45using NUnit.Framework.Internal.Commands;46{47    {48        private readonly string _testName;49        public PlaywrightTestAttribute(string testName)50        {51            _testName = testName;52        }53        public TestCommand Wrap(TestCommand command)54        {55            return new PlaywrightTestCommand(command, _testName);56        }57    }58    {59        private readonly string _testName;60        public PlaywrightTestCommand(TestCommand innerCommand, string testName) : base(innerCommand)61        {62            _testName = testName;63        }64        public override TestResult Execute(TestExecutionContext context)65        {66            TaskScheduler.UnobservedTaskException += (sender, args) =>67            {68                Console.WriteLine("Unobserved Task Exception: " + args.Exception);69                args.SetObserved();70            };

UnobservedTaskException

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4using Microsoft.Playwright.Tests;5using Microsoft.Playwright.Tests.Attributes;6using Microsoft.Playwright.Tests.TestServer;7using Microsoft.Playwright.Tests.Utils;8using Xunit;9using Xunit.Abstractions;10{11    [Collection(TestConstants.TestFixtureBrowserCollectionName)]12    {13        public PageEventsUnobservedtaskexceptionTests(ITestOutputHelper output) : base(output)14        {15        }16        [PlaywrightTest("page.spec.js", "Page.Events.Unobservedtaskexception", "should throw when uncaught exception happens")]17        [Fact(Timeout = TestConstants.DefaultTestTimeout)]18        public async Task ShouldThrowWhenUncaughtExceptionHappens()19        {20            var exception = await Assert.ThrowsAsync<PlaywrightException>(async () =>21            {22                await Page.EvaluateAsync("() => not.existing.object.property");23            });24            Assert.Equal("not is not defined", exception.Message);25        }26        [PlaywrightTest("page.spec.js", "Page.Events.Unobservedtaskexception", "should throw when uncaught exception happens in promise")]27        [Fact(Timeout = TestConstants.DefaultTestTimeout)]28        public async Task ShouldThrowWhenUncaughtExceptionHappensInPromise()29        {30            var exception = await Assert.ThrowsAsync<PlaywrightException>(async () =>31            {32                await Page.EvaluateAsync("() => Promise.reject(new Error('Error in promise'))");33            });34            Assert.Equal("Error in promise", exception.Message);35        }

UnobservedTaskException

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4using Microsoft.Playwright.Tests;5using Xunit;6using Xunit.Abstractions;7{8    {9        public PlaywrightTestAttribute(string[] browsers) { }10        public PlaywrightTestAttribute(string browser) { }11        public PlaywrightTestAttribute(string browser, string test) { }12        public PlaywrightTestAttribute(string browser, string test, string os) { }13        public PlaywrightTestAttribute(string browser, string test, string os, string[] device) { }14        public PlaywrightTestAttribute(string browser, string test, string os, string device) { }15        public PlaywrightTestAttribute(string browser, string test, string os, string device, string[] upstream) { }16        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream) { }17        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string[] tag) { }18        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag) { }19        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag, string[] ignore) { }20        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag, string ignore) { }21        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag, string ignore, bool flaky) { }22        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag, string ignore, bool flaky, bool timeout) { }23        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag, string ignore, bool flaky, bool timeout, string[] skip) { }24        public PlaywrightTestAttribute(string browser, string test, string os, string device, string upstream, string tag, string ignore, bool flaky, bool timeout, string skip) { }25    }26}27{28    {29        public PageWaitForSelectorTests(ITestOutputHelper output) : base(output)30        {

UnobservedTaskException

Using AI Code Generation

1using Microsoft.Playwright.Tests;2using System.Threading.Tasks;3using Microsoft.Playwright;4using Xunit;5using Xunit.Abstractions;6using System;7{8    {9        public UnobservedTaskException(ITestOutputHelper output) : base(output)10        {11        }12        public async Task UnobservedTaskExceptionTest()13        {14            var exception = "";15            var exceptionMessage = "";16            var exceptionType = "";17            TaskScheduler.UnobservedTaskException += (object sender, UnobservedTaskExceptionEventArgs e) =>18            {19                exception = e.Exception.ToString();20                exceptionMessage = e.Exception.Message;21                exceptionType = e.Exception.GetType().ToString();22            };23            var page = await Context.NewPageAsync();24            await page.GotoAsync(Server.EmptyPage);25            await page.EvaluateAsync("() => new Promise(r => setTimeout(r, 10))");26            GC.Collect();27            GC.WaitForPendingFinalizers();28            Assert.Contains("Unobserved task exception", exception);29            Assert.Contains("Object reference not set to an instance of an object", exceptionMessage);30            Assert.Contains("System.NullReferenceException", exceptionType);31        }32    }33}34using Microsoft.Playwright.Tests;35using System.Threading.Tasks;36using Microsoft.Playwright;37using Xunit;38using Xunit.Abstractions;39using System;40{41    {42        public UnobservedTaskException(ITestOutputHelper output) : base(output)43        {44        }45        public async Task UnobservedTaskExceptionTest()46        {47            var exception = "";48            var exceptionMessage = "";49            var exceptionType = "";50            TaskScheduler.UnobservedTaskException += (object sender, UnobservedTaskExceptionEventArgs e) =>51            {52                exception = e.Exception.ToString();53                exceptionMessage = e.Exception.Message;54                exceptionType = e.Exception.GetType().ToString();55            };56            var page = await Context.NewPageAsync();57            await page.GotoAsync(Server.EmptyPage);58            await page.EvaluateAsync("() => new Promise(r => setTimeout(r, 10))");59            GC.Collect();60            GC.WaitForPendingFinalizers();61            Assert.Contains("Unobserved task exception", exception

UnobservedTaskException

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using Microsoft.Playwright;4using Microsoft.Playwright.Tests;5using NUnit.Framework;6{7    [Parallelizable(ParallelScope.Self)]8    {9        public void BeforeTest(ITest testDetails)10        {11            TaskScheduler.UnobservedTaskException += (sender, args) =>12            {13                Console.WriteLine(args.Exception);14                args.SetObserved();15            };16        }17        public void AfterTest(ITest testDetails)18        {19        }20        public ActionTargets Targets => ActionTargets.Test;21    }22}23using System;24using System.Threading.Tasks;25using Microsoft.Playwright;26using Microsoft.Playwright.Tests;27using NUnit.Framework;28{29    [Parallelizable(ParallelScope.Self)]30    {31        public void BeforeTest(ITest testDetails)32        {33            TaskScheduler.UnobservedTaskException += (sender, args) =>34            {35                Console.WriteLine(args.Exception);36                args.SetObserved();37            };38        }39        public void AfterTest(ITest testDetails)40        {41        }42        public ActionTargets Targets => ActionTargets.Test;43    }44}45using System;46using System.Threading.Tasks;47using Microsoft.Playwright;48using Microsoft.Playwright.Tests;49using NUnit.Framework;50{51    [Parallelizable(ParallelScope.Self)]52    {53        public void BeforeTest(ITest testDetails)54        {55            TaskScheduler.UnobservedTaskException += (sender, args) =>56            {57                Console.WriteLine(args.Exception);58                args.SetObserved();59            };60        }61        public void AfterTest(ITest testDetails)62        {63        }64        public ActionTargets Targets => ActionTargets.Test;65    }66}

UnobservedTaskException

Using AI Code Generation

1[Microsoft.Playwright.Tests.PlaywrightTestAttribute("5.cs", "5", "UnobservedTaskException")]2public async System.Threading.Tasks.Task UnobservedTaskException()3{4    await Microsoft.Playwright.Tests.PlaywrightTestAttribute.UnobservedTaskException();5}6[Microsoft.Playwright.Tests.PlaywrightTestAttribute("6.cs", "6", "UnobservedTaskException")]7public async System.Threading.Tasks.Task UnobservedTaskException()8{9    await Microsoft.Playwright.Tests.PlaywrightTestAttribute.UnobservedTaskException();10}11[Microsoft.Playwright.Tests.PlaywrightTestAttribute("7.cs", "7", "UnobservedTaskException")]12public async System.Threading.Tasks.Task UnobservedTaskException()13{14    await Microsoft.Playwright.Tests.PlaywrightTestAttribute.UnobservedTaskException();15}16[Microsoft.Playwright.Tests.PlaywrightTestAttribute("8.cs", "8", "UnobservedTaskException")]17public async System.Threading.Tasks.Task UnobservedTaskException()18{19    await Microsoft.Playwright.Tests.PlaywrightTestAttribute.UnobservedTaskException();20}21[Microsoft.Playwright.Tests.PlaywrightTestAttribute("9.cs", "9", "UnobservedTaskException")]22public async System.Threading.Tasks.Task UnobservedTaskException()23{

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.