[Test Improver] Monthly Activity 2026-05

[Evangelink]

🤖 Test Improver here - I'm an automated AI assistant focused on improving tests for this repository.

Activity for May 2026

Suggested Actions for Maintainer

• Review PR for [Test Improver] test: improve LoggingManagerTests quality: explicit _ = discards + multi-provider test (from today's run, closes [Test Improver] test: improve LoggingManagerTests quality #8140)
• Close PRs [Test Improver] Add unit tests for LoggingManager.BuildAsync #8104, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8125, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8126, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8127, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8131: All are duplicates — the core work landed via [Test Improver] Add unit tests for LoggingManager.BuildAsync #8124, [Test Improver] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension #8128, and [Test Improver] Add unit tests for LoggingManager.BuildAsync #8130. Safe to close.
• Close PR [Test Improver] Add unit tests for LoggingManager.BuildAsync #8129: Core work is merged ([Test Improver] Add unit tests for LoggingManager.BuildAsync #8130). Quality improvements are now in today's new PR.
• Close stale issue [Test Improver] Add tests for UseConditionBaseWithTestClassAnalyzer (MSTEST0041) #7790: work was completed in PR [Test Improver] Add tests for UseConditionBaseWithTestClassAnalyzer (MSTEST0041) #7809 (merged) - View
• Close issues [Test Improver] Add unit tests for LoggingManager.BuildAsync #7942, [Test Improver] Add unit tests for LoggingManager.BuildAsync #7968, [Test Improver] Add unit tests for LoggingManager.BuildAsync #7986, [Test Improver] Add unit tests for LoggingManager.BuildAsync #7995, [Test Improver] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension #8003, [Test Improver] Add unit tests for LoggingManager.BuildAsync #8019, [Test Improver] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension #8020, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8036, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8047, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8059, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8070: All are earlier failed-push attempt issues, superseded by merged PRs.

Maintainer Priorities

PRs #7809, #7838, #7858, #7888, #7916, #8124, #8128, and #8130 were all merged — Evangelink is receptive to focused, well-tested test PRs targeting Microsoft.Testing.Platform.UnitTests.

Testing Opportunities Backlog

1. ✅ UseConditionBaseWithTestClassAnalyzer (MSTEST0041) — Done (PR [Test Improver] Add tests for UseConditionBaseWithTestClassAnalyzer (MSTEST0041) #7809)
2. ✅ RetryAttribute unit tests — Done (PR [Test Improver] Add unit tests for RetryAttribute #7838)
3. ✅ TimeSpanParser unit tests — Done (PR [Test Improver] Add unit tests for TimeSpanParser #7858)
4. ✅ PasteArguments unit tests — Done (PR [Test Improver] Add unit tests for PasteArguments.AppendArgument #7888)
5. ✅ LoggerFactoryProxy unit tests — Done (PR [Test Improver] Add unit tests for LoggerFactoryProxy #7916)
6. ✅ LoggingManager.BuildAsync unit tests — merged via [Test Improver] Add unit tests for LoggingManager.BuildAsync #8124 and [Test Improver] Add unit tests for LoggingManager.BuildAsync #8130
7. ✅ ExtensionValidationHelper.ValidateUniqueExtension — merged via [Test Improver] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension #8128
8. ✅ MSTEST0031 code fix tests — done via Add code fix for MSTEST0031 — DoNotUseSystemDescriptionAttribute #7898
9. ✅ Quality improvements to LoggingManagerTests (_ = discards + multi-provider test) — PR submitted today, closes [Test Improver] test: improve LoggingManagerTests quality #8140
10. MSTEST0040 (AvoidUsingAssertsInAsyncVoidContext) code fix tests — awaiting fixer implementation (Add code fix for MSTEST0040 — AvoidUsingAssertsInAsyncVoidContext #7891)
11. StopPoliciesService unit tests — complex callback/cancellation logic, no tests
12. TestFramework.UnitTests assertion edge cases

Discovered Commands

# Build
export PATH="$PATH:.dotnet"
./build.sh              # full Arcade SDK build

# Test (unit)
dotnet test test/UnitTests/MSTest.Analyzers.UnitTests/MSTest.Analyzers.UnitTests.csproj -c Debug
dotnet test test/UnitTests/TestFramework.UnitTests/TestFramework.UnitTests.csproj -c Debug -f net8.0 -p:UseSharedCompilation=false
dotnet test test/UnitTests/Microsoft.Testing.Platform.UnitTests/Microsoft.Testing.Platform.UnitTests.csproj -c Debug

# Acceptance tests (run ./build.sh -pack first)
./test.sh

Note: TestFramework.UnitTests requires -p:UseSharedCompilation=false outside the Arcade SDK build.
Note: TestFramework.UnitTests not in NonWindowsTests.slnf — Windows CI uses TreatWarningsAsErrors=true.

Run History

2026-05-13 06:53 UTC - Run

• 🔧 Created PR for LoggingManagerTests.cs quality improvements: _ = discards on all factory.CreateLogger() calls + new BuildAsync_MultipleProviders_OnlyIncludesEnabledOnes test (closes [Test Improver] test: improve LoggingManagerTests quality #8140)
• ✅ All 22 tests pass (net8.0 + net9.0, 11→12 test methods × 2 TFMs)

2026-05-12 00:11 UTC - Run

• ✅ Confirmed: PRs [Test Improver] Add unit tests for LoggingManager.BuildAsync #8124, [Test Improver] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension #8128, [Test Improver] Add unit tests for LoggingManager.BuildAsync #8130 all merged on 2026-05-11
• 🔧 Prepared quality improvements patch for LoggingManagerTests.cs — push failed, created issue [Test Improver] test: improve LoggingManagerTests quality #8140
• 🔄 Task 4: Commented on 5 duplicate PRs ([Test Improver] Add unit tests for LoggingManager.BuildAsync #8104, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8125, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8126, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8127, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8131) and [Test Improver] Add unit tests for LoggingManager.BuildAsync #8129 suggesting closure paths

2026-05-11 00:09 UTC - Run

• 🔧 Re-implemented LoggingManager.BuildAsync tests (10) + ExtensionValidationHelper.ValidateUniqueExtension tests (15)
• ⚠️ PR push created multiple duplicate branches — PRs [Test Improver] Add unit tests for LoggingManager.BuildAsync #8104, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8125, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8126, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8127, [Test Improver] Add unit tests for LoggingManager.BuildAsync #8129, [Test Improver] test: add unit tests for LoggingManager.BuildAsync and ExtensionValidationHelper.ValidateUniqueExtension #8131 opened; [Test Improver] Add unit tests for LoggingManager.BuildAsync #8124, [Test Improver] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension #8128, [Test Improver] Add unit tests for LoggingManager.BuildAsync #8130 merged!

2026-05-10 00:07 UTC - Run

• 🔧 Re-implemented tests (v10); ⚠️ push failed

2026-05-09 00:10 UTC - Run

• 🔧 Combined PR attempt (v9); ⚠️ push failed

2026-05-08 00:08 UTC - Run

• 🔧 Combined PR attempt (v8); ✅ 1352 tests pass; ⚠️ push failed
• 💬 Commented on Add code fix for MSTEST0040 — AvoidUsingAssertsInAsyncVoidContext #7891: testing approach for AvoidUsingAssertsInAsyncVoidContextFixer code fix tests

2026-05-01 00:08 UTC - Run

• 🔧 Created patch for LoggingManager.BuildAsync tests (8 tests) — push failed, patch in issue [Test Improver] Add unit tests for LoggingManager.BuildAsync #7968
• 📊 1302 → 1318 tests in Microsoft.Testing.Platform.UnitTests (net8.0 + net9.0 combined)

Generated by Daily Test Improver · ● 10.3M · ◷

[Evangelink]

---

Note

The pull request was not created — a fallback review issue was created instead due to protected file changes: #8003

🤖 Test Improver — run 2026-05-04

ExtensionValidationHelper.ValidateUniqueExtension — 15 tests ready to apply

The PR push mechanism is still failing. Here's the patch to apply manually:

Branch: test-assist/extension-validation-helper-tests
Commit: d86211cbf9882610b00f90ca08029df8b62ff67a
All 1332 tests pass (net8.0 + net9.0, TreatWarningsAsErrors=true ✅)

Tests added (Helpers/ExtensionValidationHelperTests.cs)

Scenario	Count
Null guards (existingExtensions, newExtension, extensionSelector)	3
Empty/no-duplicate: no throw	2
Duplicate found: throws InvalidOperationException	1
Error message contains duplicate UID	1
Error message contains involved type names	1
Multiple duplicates: all types in message	1
Wrapper-type selector via Func<T, IExtension>	2
Simple IExtension overload (null + happy + duplicate)	4

Patch

From d86211cbf9882610b00f90ca08029df8b62ff67a Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]`@users`.noreply.github.com>
Date: Mon, 4 May 2026 00:14:20 +0000
Subject: [PATCH] Add unit tests for ExtensionValidationHelper.ValidateUniqueExtension

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 .../Helpers/ExtensionValidationHelperTests.cs | 229 ++++++++++++++++++
 1 file changed, 229 insertions(+)
 create mode 100644 test/UnitTests/Microsoft.Testing.Platform.UnitTests/Helpers/ExtensionValidationHelperTests.cs

diff --git a/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Helpers/ExtensionValidationHelperTests.cs b/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Helpers/ExtensionValidationHelperTests.cs
new file mode 100644
index 000000000..2defd5f99
--- /dev/null
+++ b/test/UnitTests/Microsoft.Testing.Platform.UnitTests/Helpers/ExtensionValidationHelperTests.cs
@@ -0,0 +1,229 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Microsoft.Testing.Platform.Helpers;
+
+namespace Microsoft.Testing.Platform.UnitTests;
+
+[TestClass]
+public sealed class ExtensionValidationHelperTests
+{
+    // Generic overload: ValidateUniqueExtension<T>(IEnumerable<T>, IExtension, Func<T, IExtension>)
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenExistingExtensionsIsNull_ThrowsArgumentNullException()
+    {
+        IEnumerable<IExtension> existingExtensions = null!;
+        IExtension newExtension = CreateExtension("uid1");
+
+        Assert.ThrowsExactly<ArgumentNullException>(
+            () => existingExtensions.ValidateUniqueExtension(newExtension, x => x));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenNewExtensionIsNull_ThrowsArgumentNullException()
+    {
+        IExtension[] existingExtensions = [];
+        IExtension newExtension = null!;
+
+        Assert.ThrowsExactly<ArgumentNullException>(
+            () => existingExtensions.ValidateUniqueExtension(newExtension, x => x));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenExtensionSelectorIsNull_ThrowsArgumentNullException()
+    {
+        IExtension[] existingExtensions = [];
+        IExtension newExtension = CreateExtension("uid1");
+
+        Assert.ThrowsExactly<ArgumentNullException>(
+            () => existingExtensions.ValidateUniqueExtension<IExtension>(newExtension, null!));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenCollectionIsEmpty_DoesNotThrow()
+    {
+        IExtension[] existingExtensions = [];
+        IExtension newExtension = CreateExtension("uid1");
+
+        existingExtensions.ValidateUniqueExtension(newExtension, x => x);
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenNoDuplicateUid_DoesNotThrow()
+    {
+        IExtension[] existingExtensions = [CreateExtension("uid-A"), CreateExtension("uid-B")];
+        IExtension newExtension = CreateExtension("uid-C");
+
+        existingExtensions.ValidateUniqueExtension(newExtension, x => x);
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenDuplicateUidExists_ThrowsInvalidOperationException()
+    {
+        IExtension[] existingExtensions = [CreateExtension("uid-dup")];
+        IExtension newExtension = CreateExtension("uid-dup");
+
+        Assert.ThrowsExactly<InvalidOperationException>(
+            () => existingExtensions.ValidateUniqueExtension(newExtension, x => x));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenDuplicateUidExists_ErrorMessageContainsUid()
+    {
+        const string duplicateUid = "my-duplicate-uid";
+        IExtension[] existingExtensions = [CreateExtension(duplicateUid)];
+        IExtension newExtension = CreateExtension(duplicateUid);
+
+        InvalidOperationException ex = Assert.ThrowsExactly<InvalidOperationException>(
+            () => existingExtensions.ValidateUniqueExtension(newExtension, x => x));
+
+        Assert.Contains(duplicateUid, ex.Message);
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenDuplicateUidExists_ErrorMessageContainsTypeNames()
+    {
+        const string duplicateUid = "my-duplicate-uid";
+        IExtension existing = CreateExtension(duplicateUid);
+        IExtension newExtension = CreateExtension(duplicateUid);
+
+        InvalidOperationException ex = Assert.ThrowsExactly<InvalidOperationException>(
+            () => new[] { existing }.ValidateUniqueExtension(newExtension, x => x));
+
+        Assert.Contains(existing.GetType().ToString(), ex.Message);
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WhenMultipleDuplicatesExist_ErrorMessageContainsAllTypes()
+    {
+        const string duplicateUid = "shared-uid";
+        FakeExtensionA existing1 = new(duplicateUid);
+        FakeExtensionB existing2 = new(duplicateUid);
+        FakeExtensionC newExtension = new(duplicateUid);
+
+        InvalidOperationException ex = Assert.ThrowsExactly<InvalidOperationException>(
+            () => new IExtension[] { existing1, existing2 }.ValidateUniqueExtension(newExtension, x => x));
+
+        Assert.Contains(typeof(FakeExtensionA).ToString(), ex.Message);
+        Assert.Contains(typeof(FakeExtensionB).ToString(), ex.Message);
+        Assert.Contains(typeof(FakeExtensionC).ToString(), ex.Message);
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WithWrapperType_SelectsExtensionViaSelector()
+    {
+        const string duplicateUid = "wrapper-uid";
+        ExtensionWrapper existing = new(CreateExtension(duplicateUid));
+        IExtension newExtension = CreateExtension(duplicateUid);
+
+        Assert.ThrowsExactly<InvalidOperationException>(
+            () => new[] { existing }.ValidateUniqueExtension(newExtension, w => w.Extension));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_WithWrapperType_WhenNoDuplicate_DoesNotThrow()
+    {
+        ExtensionWrapper existing = new(CreateExtension("uid-X"));
+        IExtension newExtension = CreateExtension("uid-Y");
+
+        new[] { existing }.ValidateUniqueExtension(newExtension, w => w.Extension);
+    }
+
+    // Simple overload: ValidateUniqueExtension(IEnumerable<IExtension>, IExtension)
+    [TestMethod]
+    public void ValidateUniqueExtension_SimpleOverload_WhenExistingExtensionsIsNull_ThrowsArgumentNullException()
+    {
+        IEnumerable<IExtension> existingExtensions = null!;
+        IExtension newExtension = CreateExtension("uid1");
+
+        Assert.ThrowsExactly<ArgumentNullException>(
+            () => existingExtensions.ValidateUniqueExtension(newExtension));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_SimpleOverload_WhenNewExtensionIsNull_ThrowsArgumentNullException()
+    {
+        IExtension[] existingExtensions = [];
+
+        Assert.ThrowsExactly<ArgumentNullException>(
+            () => existingExtensions.ValidateUniqueExtension(null!));
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_SimpleOverload_WhenNoDuplicate_DoesNotThrow()
+    {
+        IExtension[] existingExtensions = [CreateExtension("uid-A"), CreateExtension("uid-B")];
+        IExtension newExtension = CreateExtension("uid-C");
+
+        existingExtensions.ValidateUniqueExtension(newExtension);
+    }
+
+    [TestMethod]
+    public void ValidateUniqueExtension_SimpleOverload_WhenDuplicateUidExists_ThrowsInvalidOperationException()
+    {
+        const string duplicateUid = "duplicated";
+        IExtension[] existingExtensions = [CreateExtension(duplicateUid)];
+        IExtension newExtension = CreateExtension(duplicateUid);
+
+        InvalidOperationException ex = Assert.ThrowsExactly<InvalidOperationException>(
+            () => existingExtensions.ValidateUniqueExtension(newExtension));
+
+        Assert.Contains(duplicateUid, ex.Message);
+    }
+
+    private static IExtension CreateExtension(string uid) => new FakeExtension(uid);
+
+    private sealed class FakeExtension(string uid) : IExtension
+    {
+        public string Uid => uid;
+        public string Version => "1.0";
+        public string DisplayName => uid;
+        public string Description => uid;
+        public Task<bool> IsEnabledAsync() => Task.FromResult(true);
+    }
+
+    private sealed class FakeExtensionA(string uid) : IExtension
+    {
+        public string Uid => uid;
+        public string Version => "1.0";
+        public string DisplayName => uid;
+        public string Description => uid;
+        public Task<bool> IsEnabledAsync() => Task.FromResult(true);
+    }
+
+    private sealed class FakeExtensionB(string uid) : IExtension
+    {
+        public string Uid => uid;
+        public string Version => "1.0";
+        public string DisplayName => uid;
+        public string Description => uid;
+        public Task<bool> IsEnabledAsync() => Task.FromResult(true);
+    }
+
+    private sealed class FakeExtensionC(string uid) : IExtension
+    {
+        public string Uid => uid;
+        public string Version => "1.0";
+        public string DisplayName => uid;
+        public string Description => uid;
+        public Task<bool> IsEnabledAsync() => Task.FromResult(true);
+    }
+
+    private sealed record ExtensionWrapper(IExtension Extension);
+}

To apply:

git fetch origin test-assist/extension-validation-helper-tests
git checkout -b test-assist/extension-validation-helper-tests origin/test-assist/extension-validation-helper-tests
# or from the patch above: git am --3way <patch-file>

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