Retrieve TestContext's by ID

TUnit.Core/TestContext.cs

@@ -17,6 +17,7 @@ namespace TUnit.Core;
 [DebuggerDisplay("{TestDetails.ClassType.Name}.{GetDisplayName(),nq}")]
 public class TestContext : Context
 {
+    private static readonly Dictionary<Guid, TestContext> _testContextsById = new(1000);
     private readonly TestBuilderContext _testBuilderContext;
     private string? _cachedDisplayName;
 
@@ -27,8 +28,12 @@ public TestContext(string testName, IServiceProvider serviceProvider, ClassHookC
         CancellationToken = cancellationToken;
         ServiceProvider = serviceProvider;
         ClassContext = classContext;
+
+        _testContextsById[_testBuilderContext.Id] = this;
     }
 
+    public Guid Id => _testBuilderContext.Id;
+
     private static readonly AsyncLocal<TestContext?> TestContexts = new();
 
     internal static readonly Dictionary<string, List<string>> InternalParametersDictionary = new();
@@ -47,6 +52,8 @@ internal set
         }
     }
 
+    public static TestContext? GetById(Guid id) => _testContextsById.GetValueOrDefault(id);
+
     public static IReadOnlyDictionary<string, List<string>> Parameters => InternalParametersDictionary;
 
     public static IConfiguration Configuration { get; internal set; } = null!;
@@ -96,21 +103,21 @@ public static string WorkingDirectory
 
     // New: Support multiple parallel constraints
     private readonly List<IParallelConstraint> _parallelConstraints = [];
-    
+
     /// <summary>
     /// Gets the collection of parallel constraints applied to this test.
     /// Multiple constraints can be combined (e.g., ParallelGroup + NotInParallel).
     /// </summary>
     public IReadOnlyList<IParallelConstraint> ParallelConstraints => _parallelConstraints;
-    
+
     /// <summary>
     /// Gets or sets the primary parallel constraint for backward compatibility.
     /// When setting, this replaces all existing constraints.
     /// When getting, returns the first constraint or null if none exist.
     /// </summary>
     [Obsolete("Use ParallelConstraints collection instead. This property is maintained for backward compatibility.")]
-    public IParallelConstraint? ParallelConstraint 
-    { 
+    public IParallelConstraint? ParallelConstraint
+    {
         get => _parallelConstraints.FirstOrDefault();
         set
         {
@@ -121,7 +128,7 @@ public IParallelConstraint? ParallelConstraint
             }
         }
     }
-    
+
     /// <summary>
     /// Adds a parallel constraint to this test context.
     /// Multiple constraints can be combined to create complex parallelization rules.

TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.DotNet8_0.verified.txt

@@ -1234,6 +1234,7 @@ namespace
         public ? DisplayNameFormatter { get; set; }
         public .TestContextEvents Events { get; }
         public . ExecutionPriority { get; set; }
+        public  Id { get; }
         public .CancellationTokenSource? LinkedCancellationTokens { get; set; }
         public object Lock { get; }
         public .<string, object?> ObjectBag { get; }
@@ -1277,6 +1278,7 @@ namespace
         public void SetParallelLimiter(. parallelLimit) { }
         public void WriteError(string message) { }
         public void WriteLine(string message) { }
+        public static .TestContext? GetById( id) { }
     }
     public class TestContextEvents
     {

TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.DotNet9_0.verified.txt

@@ -1234,6 +1234,7 @@ namespace
         public ? DisplayNameFormatter { get; set; }
         public .TestContextEvents Events { get; }
         public . ExecutionPriority { get; set; }
+        public  Id { get; }
         public .CancellationTokenSource? LinkedCancellationTokens { get; set; }
         public object Lock { get; }
         public .<string, object?> ObjectBag { get; }
@@ -1277,6 +1278,7 @@ namespace
         public void SetParallelLimiter(. parallelLimit) { }
         public void WriteError(string message) { }
         public void WriteLine(string message) { }
+        public static .TestContext? GetById( id) { }
     }
     public class TestContextEvents
     {

TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt

@@ -1160,6 +1160,7 @@ namespace
         public ? DisplayNameFormatter { get; set; }
         public .TestContextEvents Events { get; }
         public . ExecutionPriority { get; set; }
+        public  Id { get; }
         public .CancellationTokenSource? LinkedCancellationTokens { get; set; }
         public object Lock { get; }
         public .<string, object?> ObjectBag { get; }
@@ -1202,6 +1203,7 @@ namespace
         public void SetParallelLimiter(. parallelLimit) { }
         public void WriteError(string message) { }
         public void WriteLine(string message) { }
+        public static .TestContext? GetById( id) { }
     }
     public class TestContextEvents
     {

TUnit.TestProject/TestContextTests.cs

@@ -0,0 +1,17 @@
+using TUnit.TestProject.Attributes;
+
+namespace TUnit.TestProject;
+
+[EngineTest(ExpectedResult.Pass)]
+public class TestContextTests
+{
+    [Test]
+    public async Task Test()
+    {
+        var id = TestContext.Current!.Id;
+
+        var context = TestContext.GetById(id);
+
+        await Assert.That(context).IsNotNull();
+    }
+}