diff --git a/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/IUnitTestingStackTraceServiceAccessor.cs b/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/IUnitTestingStackTraceServiceAccessor.cs
new file mode 100644
index 0000000000000..daed2fdca3eba
--- /dev/null
+++ b/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/IUnitTestingStackTraceServiceAccessor.cs
@@ -0,0 +1,19 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Immutable;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.Host;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api
+{
+    internal interface IUnitTestingStackTraceServiceAccessor : IWorkspaceService
+    {
+        Task<ImmutableArray<UnitTestingParsedFrameWrapper>> TryParseAsync(string input, Workspace workspace, CancellationToken cancellationToken);
+        Task<UnitTestingDefinitionItemWrapper?> TryFindMethodDefinitionAsync(Workspace workspace, UnitTestingParsedFrameWrapper parsedFrame, CancellationToken cancellationToken);
+        (Document? document, int lineNumber) GetDocumentAndLine(Workspace workspace, UnitTestingParsedFrameWrapper parsedFrame);
+        Task<bool> TryNavigateToAsync(Workspace workspace, UnitTestingDefinitionItemWrapper definitionItem, bool showInPreviewTab, bool activateTab, CancellationToken cancellationToken);
+    }
+}
diff --git a/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/UnitTestingDefinitionItemWrapper.cs b/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/UnitTestingDefinitionItemWrapper.cs
new file mode 100644
index 0000000000000..5a066d48da9d5
--- /dev/null
+++ b/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/UnitTestingDefinitionItemWrapper.cs
@@ -0,0 +1,16 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api
+{
+    internal readonly struct UnitTestingDefinitionItemWrapper
+    {
+        internal FindUsages.DefinitionItem UnderlyingObject { get; }
+
+        public UnitTestingDefinitionItemWrapper(FindUsages.DefinitionItem definition)
+        {
+            UnderlyingObject = definition;
+        }
+    }
+}
diff --git a/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/UnitTestingParsedFrameWrapper.cs b/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/UnitTestingParsedFrameWrapper.cs
new file mode 100644
index 0000000000000..5159b778f2448
--- /dev/null
+++ b/src/Features/Core/Portable/ExternalAccess/UnitTesting/API/UnitTestingParsedFrameWrapper.cs
@@ -0,0 +1,18 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.CodeAnalysis.StackTraceExplorer;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api
+{
+    internal readonly struct UnitTestingParsedFrameWrapper
+    {
+        internal ParsedFrame UnderlyingObject { get; }
+
+        public UnitTestingParsedFrameWrapper(ParsedFrame parsedFrame)
+        {
+            UnderlyingObject = parsedFrame;
+        }
+    }
+}
diff --git a/src/Features/Core/Portable/ExternalAccess/UnitTesting/UnitTestingStackTraceServiceAccessor.cs b/src/Features/Core/Portable/ExternalAccess/UnitTesting/UnitTestingStackTraceServiceAccessor.cs
new file mode 100644
index 0000000000000..cc74dbe801c29
--- /dev/null
+++ b/src/Features/Core/Portable/ExternalAccess/UnitTesting/UnitTestingStackTraceServiceAccessor.cs
@@ -0,0 +1,46 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Collections.Immutable;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api;
+using Microsoft.CodeAnalysis.Host.Mef;
+using Microsoft.CodeAnalysis.StackTraceExplorer;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting
+{
+    internal class UnitTestingStackTraceServiceAccessor : IUnitTestingStackTraceServiceAccessor
+    {
+        private readonly IStackTraceExplorerService _stackTraceExplorerService;
+
+        [Obsolete(MefConstruction.FactoryMethodMessage, error: true)]
+        public UnitTestingStackTraceServiceAccessor(
+            IStackTraceExplorerService stackTraceExplorerService)
+        {
+            _stackTraceExplorerService = stackTraceExplorerService;
+        }
+
+        public (Document? document, int lineNumber) GetDocumentAndLine(Workspace workspace, UnitTestingParsedFrameWrapper parsedFrame)
+            => _stackTraceExplorerService.GetDocumentAndLine(workspace.CurrentSolution, parsedFrame.UnderlyingObject);
+
+        public async Task<UnitTestingDefinitionItemWrapper?> TryFindMethodDefinitionAsync(Workspace workspace, UnitTestingParsedFrameWrapper parsedFrame, CancellationToken cancellationToken)
+        {
+            var definition = await _stackTraceExplorerService.TryFindDefinitionAsync(workspace.CurrentSolution, parsedFrame.UnderlyingObject, StackFrameSymbolPart.Method, cancellationToken).ConfigureAwait(false);
+            return definition is null
+                ? null
+                : new UnitTestingDefinitionItemWrapper(definition);
+        }
+
+        public async Task<ImmutableArray<UnitTestingParsedFrameWrapper>> TryParseAsync(string input, Workspace workspace, CancellationToken cancellationToken)
+        {
+            var result = await StackTraceAnalyzer.AnalyzeAsync(input, cancellationToken).ConfigureAwait(false);
+            return result.ParsedFrames.SelectAsArray(p => new UnitTestingParsedFrameWrapper(p));
+        }
+
+        public Task<bool> TryNavigateToAsync(Workspace workspace, UnitTestingDefinitionItemWrapper definitionItem, bool showInPreviewTab, bool activateTab, CancellationToken cancellationToken)
+            => definitionItem.UnderlyingObject.TryNavigateToAsync(workspace, showInPreviewTab, activateTab, cancellationToken);
+    }
+}
diff --git a/src/Features/Core/Portable/ExternalAccess/UnitTesting/UnitTestingStackTraceServiceAccessorFactory.cs b/src/Features/Core/Portable/ExternalAccess/UnitTesting/UnitTestingStackTraceServiceAccessorFactory.cs
new file mode 100644
index 0000000000000..6f439c85d209f
--- /dev/null
+++ b/src/Features/Core/Portable/ExternalAccess/UnitTesting/UnitTestingStackTraceServiceAccessorFactory.cs
@@ -0,0 +1,32 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Composition;
+using Microsoft.CodeAnalysis.ExternalAccess.UnitTesting.Api;
+using Microsoft.CodeAnalysis.Host;
+using Microsoft.CodeAnalysis.Host.Mef;
+using Microsoft.CodeAnalysis.StackTraceExplorer;
+
+namespace Microsoft.CodeAnalysis.ExternalAccess.UnitTesting
+{
+    [ExportWorkspaceServiceFactory(typeof(IUnitTestingStackTraceServiceAccessor))]
+    [Shared]
+
+    internal class UnitTestingStackTraceServiceAccessorFactory : IWorkspaceServiceFactory
+    {
+        [ImportingConstructor]
+        [Obsolete(MefConstruction.ImportingConstructorMessage, error: true)]
+        public UnitTestingStackTraceServiceAccessorFactory()
+        {
+        }
+
+        [Obsolete(MefConstruction.FactoryMethodMessage, error: true)]
+        public IWorkspaceService CreateService(HostWorkspaceServices workspaceServices)
+        {
+            var stackTraceExplorerService = workspaceServices.GetRequiredService<IStackTraceExplorerService>();
+            return new UnitTestingStackTraceServiceAccessor(stackTraceExplorerService);
+        }
+    }
+}