How to use Callback method of Xunit.Runner.v2.DescriptorCallback class

Best Xunit code snippet using Xunit.Runner.v2.DescriptorCallback.Callback

Xunit2.cs

Source:Xunit2.cs

...126		public string TestFrameworkDisplayName => remoteDiscoverer.TestFrameworkDisplayName;127		List<KeyValuePair<string?, ITestCase?>> BulkDeserialize(List<string> serializations)128		{129			Guard.NotNull($"This instance of {typeof(Xunit2).FullName} was created for discovery only; execution-related operations cannot be performed.", remoteExecutor);130			var callbackContainer = new DeserializeCallback();131			Action<List<KeyValuePair<string?, ITestCase?>>> callback = callbackContainer.Callback;132			if (bulkDeserializer == null)133			{134				if (AppDomain.HasAppDomain)135				{136					try137					{138						AppDomain.CreateObject<object>(TestFrameworkAssemblyName, "Xunit.Sdk.TestCaseBulkDeserializer", remoteDiscoverer, remoteExecutor, serializations, callback);139						if (callbackContainer.Results != null)140							return callbackContainer.Results;141					}142					catch (TypeLoadException) { }    // Only be willing to eat "Xunit.Sdk.TestCaseBulkDeserialize" doesn't exist143				}144				bulkDeserializer = new DefaultTestCaseBulkDeserializer(remoteExecutor);145			}146			return bulkDeserializer.BulkDeserialize(serializations);147		}148		/// <summary>149		/// Creates a high performance cross-AppDomain message sink that utilizes <see cref="IMessageSinkWithTypes"/>150		/// which can be passed to <see cref="ITestFrameworkDiscoverer"/> and <see cref="ITestFrameworkExecutor"/>.151		/// </summary>152		/// <param name="sink">The local message sink to receive the messages.</param>153		/// <param name="serializeDiscoveredTestCases">A flag which indicates whether test case serialization is required</param>154		protected IMessageSink CreateOptimizedRemoteMessageSink(155			_IMessageSink sink,156			bool serializeDiscoveredTestCases = true)157		{158			Guard.ArgumentNotNull(sink);159			var v2MessageSink = new Xunit2MessageSink(sink, TestAssemblyUniqueID, serializeDiscoveredTestCases ? remoteDiscoverer : null);160			try161			{162				var asssemblyName = typeof(OptimizedRemoteMessageSink).Assembly.GetName();163				var optimizedSink = AppDomain.CreateObject<IMessageSink>(asssemblyName, typeof(OptimizedRemoteMessageSink).FullName!, v2MessageSink);164				if (optimizedSink != null)165					return optimizedSink;166			}167			catch { }    // This really shouldn't happen, but falling back makes sense in catastrophic cases168			return v2MessageSink;169		}170		/// <inheritdoc/>171		public virtual ValueTask DisposeAsync()172		{173			if (disposed)174				throw new ObjectDisposedException(GetType().FullName);175			disposed = true;176			return DisposalTracker.DisposeAsync();177		}178		/// <inheritdoc/>179		public void Find(180			_IMessageSink messageSink,181			FrontControllerFindSettings settings)182		{183			Guard.ArgumentNotNull(messageSink);184			Guard.ArgumentNotNull(settings);185			var includeSourceInformation = settings.Options.GetIncludeSourceInformationOrDefault();186			var filteringMessageSink = new FilteringMessageSink(messageSink, settings.Filters.Filter);187			// TODO: We're missing a potential optimization where we could determine that the filter188			// is exactly 1 (or maybe only?) "include class" filters, and then call the version of189			// Find on the remote discoverer that takes a type name.190			SendDiscoveryStartingMessage(messageSink);191			remoteDiscoverer.Find(192				includeSourceInformation,193				CreateOptimizedRemoteMessageSink(filteringMessageSink),194				Xunit2OptionsAdapter.Adapt(settings.Options)195			);196		}197		/// <inheritdoc/>198		public void FindAndRun(199			_IMessageSink messageSink,200			FrontControllerFindAndRunSettings settings)201		{202			Guard.NotNull($"This instance of {typeof(Xunit2).FullName} was created for discovery only; execution-related operations cannot be performed.", remoteExecutor);203			Guard.ArgumentNotNull(messageSink);204			Guard.ArgumentNotNull(settings);205			if (settings.Filters.Empty)206			{207				remoteExecutor.RunAll(208					CreateOptimizedRemoteMessageSink(messageSink),209					Xunit2OptionsAdapter.Adapt(settings.DiscoveryOptions),210					Xunit2OptionsAdapter.Adapt(settings.ExecutionOptions)211				);212				return;213			}214			using var discoverySink = new Xunit2DiscoverySink(settings.Filters);215			remoteDiscoverer.Find(216				includeSourceInformation: false,217				discoverySink,218				Xunit2OptionsAdapter.Adapt(settings.DiscoveryOptions)219			);220			discoverySink.Finished.WaitOne();221			remoteExecutor.RunTests(222				discoverySink.TestCases,223				CreateOptimizedRemoteMessageSink(messageSink),224				Xunit2OptionsAdapter.Adapt(settings.ExecutionOptions)225			);226		}227		static string GetExecutionAssemblyFileName(AppDomainSupport appDomainSupport, string basePath)228		{229			var supportedPlatformSuffixes = GetSupportedPlatformSuffixes(appDomainSupport);230			foreach (var suffix in supportedPlatformSuffixes)231			{232#if NETFRAMEWORK233				var fileName = Path.Combine(basePath, $"xunit.execution.{suffix}.dll");234				if (File.Exists(fileName))235					return fileName;236#else237				try238				{239					var assemblyName = $"xunit.execution.{suffix}";240					Assembly.Load(new AssemblyName { Name = assemblyName });241					return assemblyName + ".dll";242				}243				catch { }244#endif245			}246			throw new InvalidOperationException("Could not find/load any of the following assemblies: " + string.Join(", ", supportedPlatformSuffixes.Select(suffix => $"xunit.execution.{suffix}.dll").ToArray()));247		}248		static string[] GetSupportedPlatformSuffixes(AppDomainSupport appDomainSupport)249		{250#if NETFRAMEWORK251			return appDomainSupport == AppDomainSupport.Required ? SupportedPlatforms_ForcedAppDomains : SupportedPlatforms;252#else253			return SupportedPlatforms;254#endif255		}256		static AssemblyName GetTestFrameworkAssemblyName(string xunitExecutionAssemblyPath)257		{258#if NETFRAMEWORK259			return AssemblyName.GetAssemblyName(xunitExecutionAssemblyPath);260#else261			// Make sure we only use the short form262			return Assembly.Load(new AssemblyName { Name = Path.GetFileNameWithoutExtension(xunitExecutionAssemblyPath), Version = new Version(0, 0, 0, 0) }).GetName();263#endif264		}265		static string GetXunitExecutionAssemblyPath(266			AppDomainSupport appDomainSupport,267			string assemblyFileName,268			bool verifyTestAssemblyExists)269		{270			Guard.ArgumentNotNullOrEmpty(assemblyFileName);271			if (verifyTestAssemblyExists)272				Guard.FileExists(assemblyFileName);273			return GetExecutionAssemblyFileName(appDomainSupport, Path.GetDirectoryName(assemblyFileName)!);274		}275		static string GetXunitExecutionAssemblyPath(276			AppDomainSupport appDomainSupport,277			_IAssemblyInfo assemblyInfo)278		{279			Guard.ArgumentNotNull(assemblyInfo);280			Guard.ArgumentNotNullOrEmpty(assemblyInfo.AssemblyPath);281			return GetExecutionAssemblyFileName(appDomainSupport, Path.GetDirectoryName(assemblyInfo.AssemblyPath)!);282		}283#if NETFRAMEWORK284		static bool IsDotNet(string executionAssemblyFileName) =>285			executionAssemblyFileName.EndsWith(".dotnet.dll", StringComparison.Ordinal);286#endif287		/// <inheritdoc/>288		public void Run(289			_IMessageSink messageSink,290			FrontControllerRunSettings settings)291		{292			Guard.NotNull($"This instance of {typeof(Xunit2).FullName} was created for discovery only; execution-related operations cannot be performed.", remoteExecutor);293			Guard.ArgumentNotNull(messageSink);294			Guard.ArgumentNotNull(settings);295			remoteExecutor.RunTests(296				BulkDeserialize(settings.SerializedTestCases.ToList()).Select(kvp => kvp.Value).ToList(),297				CreateOptimizedRemoteMessageSink(messageSink),298				Xunit2OptionsAdapter.Adapt(settings.Options)299			);300		}301		void SendDiscoveryStartingMessage(_IMessageSink messageSink)302		{303			// There is no v2 equivalent to this, so we manufacture it ourselves304			var discoveryStarting = new _DiscoveryStarting305			{306				AssemblyName = assemblyInfo.Name,307				AssemblyPath = assemblyInfo.AssemblyPath,308				AssemblyUniqueID = UniqueIDGenerator.ForAssembly(assemblyInfo.Name, assemblyInfo.AssemblyPath, configFileName),309				ConfigFilePath = configFileName310			};311			messageSink.OnMessage(discoveryStarting);312		}313		// Factory methods314		/// <summary>315		/// Returns an implementation of <see cref="IFrontControllerDiscoverer"/> which can be used316		/// to discover xUnit.net v2 tests, including source-based discovery.317		/// </summary>318		/// <param name="assemblyInfo">The assembly to use for discovery</param>319		/// <param name="projectAssembly">The test project assembly.</param>320		/// <param name="xunitExecutionAssemblyPath">The path on disk of xunit.execution.*.dll; if <c>null</c>, then321		/// the location of xunit.execution.*.dll is implied based on the location of the test assembly</param>322		/// <param name="sourceInformationProvider">The optional source information provider.</param>323		/// <param name="diagnosticMessageSink">The message sink which receives <see cref="_DiagnosticMessage"/> messages.</param>324		/// <param name="verifyAssembliesOnDisk">Determines whether or not to check for the existence of assembly files.</param>325		public static IFrontControllerDiscoverer ForDiscovery(326			_IAssemblyInfo assemblyInfo,327			XunitProjectAssembly projectAssembly,328			string? xunitExecutionAssemblyPath = null,329			_ISourceInformationProvider? sourceInformationProvider = null,330			_IMessageSink? diagnosticMessageSink = null,331			bool verifyAssembliesOnDisk = true)332		{333			var appDomainSupport = projectAssembly.Configuration.AppDomainOrDefault;334			Guard.ArgumentNotNull(assemblyInfo);335			return new Xunit2(336				diagnosticMessageSink ?? _NullMessageSink.Instance,337				appDomainSupport,338				sourceInformationProvider ?? _NullSourceInformationProvider.Instance,  // TODO: Need to find a way to be able to use VisualStudioSourceInformationProvider339				assemblyInfo,340				assemblyFileName: null,341				xunitExecutionAssemblyPath ?? GetXunitExecutionAssemblyPath(appDomainSupport, assemblyInfo),342				projectAssembly.ConfigFileName,343				projectAssembly.Configuration.ShadowCopyOrDefault,344				projectAssembly.Configuration.ShadowCopyFolder,345				verifyAssembliesOnDisk346			);347		}348		/// <summary>349		/// Returns an implementation of <see cref="IFrontController"/> which can be used350		/// for both discovery and execution of xUnit.net v2 tests.351		/// </summary>352		/// <param name="projectAssembly">The test project assembly.</param>353		/// <param name="sourceInformationProvider">The optional source information provider.</param>354		/// <param name="diagnosticMessageSink">The message sink which receives <see cref="_DiagnosticMessage"/> messages.</param>355		/// <param name="verifyAssembliesOnDisk">Determines whether or not to check for the existence of assembly files.</param>356		public static IFrontController ForDiscoveryAndExecution(357			XunitProjectAssembly projectAssembly,358			_ISourceInformationProvider? sourceInformationProvider = null,359			_IMessageSink? diagnosticMessageSink = null,360			bool verifyAssembliesOnDisk = true)361		{362			Guard.ArgumentNotNull(projectAssembly);363			var appDomainSupport = projectAssembly.Configuration.AppDomainOrDefault;364			var assemblyFileName = Guard.ArgumentNotNull(projectAssembly.AssemblyFileName);365			if (diagnosticMessageSink == null)366				diagnosticMessageSink = _NullMessageSink.Instance;367			return new Xunit2(368				diagnosticMessageSink,369				appDomainSupport,370#if NETSTANDARD371				sourceInformationProvider ?? _NullSourceInformationProvider.Instance,372#else373				sourceInformationProvider ?? new VisualStudioSourceInformationProvider(assemblyFileName, diagnosticMessageSink),374#endif375				assemblyInfo: null,376				assemblyFileName,377				GetXunitExecutionAssemblyPath(appDomainSupport, assemblyFileName, verifyAssembliesOnDisk),378				projectAssembly.ConfigFileName,379				projectAssembly.Configuration.ShadowCopyOrDefault,380				projectAssembly.Configuration.ShadowCopyFolder,381				verifyAssembliesOnDisk382			);383		}384		// Inner classes385		class DescriptorCallback : LongLivedMarshalByRefObject386		{387			public List<string>? Results;388			public void Callback(List<string> results) => Results = results;389		}390		class DeserializeCallback : LongLivedMarshalByRefObject391		{392			public List<KeyValuePair<string?, ITestCase?>>? Results;393			public void Callback(List<KeyValuePair<string?, ITestCase?>> results) => Results = results;394		}395		class FilteringMessageSink : _IMessageSink396		{397			readonly Predicate<_TestCaseDiscovered> filter;398			readonly _IMessageSink innerMessageSink;399			public FilteringMessageSink(400				_IMessageSink innerMessageSink,401				Predicate<_TestCaseDiscovered> filter)402			{403				this.innerMessageSink = innerMessageSink;404				this.filter = filter;405			}406			public bool OnMessage(_MessageSinkMessage message)407			{...

Xunit2Discoverer.cs

Source:Xunit2Discoverer.cs

...160        }161        /// <inheritdoc/>162        public List<TestCaseDescriptor> GetTestCaseDescriptors(List<ITestCase> testCases, bool includeSerialization)163        {164            var callbackContainer = new DescriptorCallback();165            Action<List<string>> callback = callbackContainer.Callback;166            if (defaultTestCaseDescriptorProvider == null)167            {168                if (AppDomain.HasAppDomain)169                {170                    try171                    {172                        AppDomain.CreateObject<object>(TestFrameworkAssemblyName, "Xunit.Sdk.TestCaseDescriptorFactory", includeSerialization ? RemoteDiscoverer : null, testCases, callback);173                        if (callbackContainer.Results != null)174                            return callbackContainer.Results.Select(x => new TestCaseDescriptor(x)).ToList();175                    }176                    catch (TypeLoadException) { }    // Only be willing to eat "Xunit.Sdk.TestCaseDescriptorFactory" doesn't exist177                }178                defaultTestCaseDescriptorProvider = new DefaultTestCaseDescriptorProvider(RemoteDiscoverer);179            }180            return defaultTestCaseDescriptorProvider.GetTestCaseDescriptors(testCases, includeSerialization);181        }182        static string GetExecutionAssemblyFileName(AppDomainSupport appDomainSupport, string basePath)183        {184            var supportedPlatformSuffixes = GetSupportedPlatformSuffixes(appDomainSupport);185            foreach (var suffix in supportedPlatformSuffixes)186            {187#if NET35 || NET452188                var fileName = Path.Combine(basePath, $"xunit.execution.{suffix}.dll");189                if (File.Exists(fileName))190                    return fileName;191#else192                try193                {194                    var assemblyName = $"xunit.execution.{suffix}";195                    Assembly.Load(new AssemblyName { Name = assemblyName });196                    return assemblyName + ".dll";197                }198                catch { }199#endif200            }201            throw new InvalidOperationException("Could not find/load any of the following assemblies: " + string.Join(", ", supportedPlatformSuffixes.Select(suffix => $"xunit.execution.{suffix}.dll").ToArray()));202        }203        static string[] GetSupportedPlatformSuffixes(AppDomainSupport appDomainSupport)204        {205#if NET35 || NET452206            return appDomainSupport == AppDomainSupport.Required ? SupportedPlatforms_ForcedAppDomains : SupportedPlatforms;207#else208            return SupportedPlatforms;209#endif210        }211        static AssemblyName GetTestFrameworkAssemblyName(string xunitExecutionAssemblyPath)212        {213#if NET35 || NET452214            return AssemblyName.GetAssemblyName(xunitExecutionAssemblyPath);215#elif NETCOREAPP1_0216            return new AssemblyName(Path.GetFileNameWithoutExtension(xunitExecutionAssemblyPath));217#else218            // Make sure we only use the short form219            return Assembly.Load(new AssemblyName { Name = Path.GetFileNameWithoutExtension(xunitExecutionAssemblyPath), Version = new Version(0, 0, 0, 0) }).GetName();220#endif221        }222        static string GetXunitExecutionAssemblyPath(AppDomainSupport appDomainSupport, string assemblyFileName, bool verifyTestAssemblyExists)223        {224            Guard.ArgumentNotNullOrEmpty("assemblyFileName", assemblyFileName);225            if (verifyTestAssemblyExists)226                Guard.FileExists("assemblyFileName", assemblyFileName);227            return GetExecutionAssemblyFileName(appDomainSupport, Path.GetDirectoryName(assemblyFileName));228        }229        static string GetXunitExecutionAssemblyPath(AppDomainSupport appDomainSupport, IAssemblyInfo assemblyInfo)230        {231            Guard.ArgumentNotNull("assemblyInfo", assemblyInfo);232            Guard.ArgumentNotNullOrEmpty("assemblyInfo.AssemblyPath", assemblyInfo.AssemblyPath);233            return GetExecutionAssemblyFileName(appDomainSupport, Path.GetDirectoryName(assemblyInfo.AssemblyPath));234        }235        static bool IsDotNet(string executionAssemblyFileName)236            => executionAssemblyFileName.EndsWith(".dotnet.dll", StringComparison.Ordinal);237        /// <inheritdoc/>238        public string Serialize(ITestCase testCase)239            => RemoteDiscoverer.Serialize(testCase);240        class DescriptorCallback : LongLivedMarshalByRefObject241        {242            public List<string> Results;243            public void Callback(List<string> results) => Results = results;244        }245    }246}...

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