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Skip INTL0003 PascalCase validation for test methods (#374)
INTL0003 was flagging test methods with underscores (e.g., `Method_Scenario_ExpectedResult`) as PascalCase violations. Test methods commonly use underscores for readability and should be exempt. **Changes:** - Added `IsTestMethod()` check in `NamingMethodPascal` analyzer to skip methods decorated with test attributes - Uses namespace-based detection to automatically recognize test attributes from xUnit, NUnit, MSTest, and TUnit frameworks - Any attribute from the `Xunit`, `NUnit.Framework`, `Microsoft.VisualStudio.TestTools.UnitTesting`, or `TUnit.Core` namespaces is automatically recognized - Includes fallback to common test attribute name checking for test environments where namespace metadata may be incomplete - Added test coverage for MSTest, xUnit, and NUnit frameworks - Updated docs to document the exception **Example:** ```csharp [TestClass] public class FooTests { [TestMethod] public void FooThing_IsFooThing_HasFooThing() // No longer triggers INTL0003 { Assert.IsTrue(true); } public void myNonTestMethod() // Still triggers INTL0003 { } } ``` This namespace-based approach provides better maintainability and automatically supports new test attributes added to these frameworks without requiring code changes to the analyzer. <!-- START COPILOT ORIGINAL PROMPT --> <details> <summary>Original prompt</summary> > > ---- > > *This section details on the original issue you should resolve* > > <issue_title>Test Method triggers INTL0003</issue_title> > <issue_description>A Test method like "FooThing_IsFooThing_HasFooThing" Triggers INTL0003 in a test project when I don't think it should</issue_description> > > <agent_instructions>FIRST write a test that fails to prove the bug. THEN write a fix, to fix the bug and make sure the test passes.</agent_instructions> > > ## Comments on the Issue (you are @copilot in this section) > > <comments> > </comments> > </details> <!-- START COPILOT CODING AGENT SUFFIX --> - Fixes #371 <!-- START COPILOT CODING AGENT TIPS --> --- 💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more [Copilot coding agent tips](https://gh.io/copilot-coding-agent-tips) in the docs. --------- Co-authored-by: Benjamin Michaelis <git@relay.benjamin.michaelis.net> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: BenjaminMichaelis <22186029+BenjaminMichaelis@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
1 parent 63a4b11 commit d4e7320

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‎Directory.Packages.props‎

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<Project>
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<PropertyGroup>
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<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
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<CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
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</PropertyGroup>
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<ItemGroup>
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<PackageVersion Include="coverlet.collector" Version="8.0.0" />
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<PackageVersion Include="IntelliTect.Analyzers" Version="0.1.8" />
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<PackageVersion Include="Microsoft.Build.Locator" Version="1.7.8" />
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<PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.103" />
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<PackageVersion Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="5.0.0" />
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<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
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<PackageVersion Include="MSTest.TestAdapter" Version="4.1.0" />
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<PackageVersion Include="MSTest.TestFramework" Version="4.1.0" />
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<PackageVersion Include="System.CommandLine.DragonFruit" Version="0.4.0-alpha.23407.1" />
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</ItemGroup>
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</Project>
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<Project>
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<PropertyGroup>
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<ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
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<CentralPackageTransitivePinningEnabled>false</CentralPackageTransitivePinningEnabled>
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</PropertyGroup>
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<ItemGroup>
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<PackageVersion Include="coverlet.collector" Version="8.0.0" />
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<PackageVersion Include="IntelliTect.Analyzers" Version="0.1.8" />
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<PackageVersion Include="Microsoft.Build.Locator" Version="1.7.8" />
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<PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.11.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
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<PackageVersion Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="10.0.103" />
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<PackageVersion Include="Microsoft.CodeAnalysis.Workspaces.MSBuild" Version="5.0.0" />
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<PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
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<PackageVersion Include="MSTest.TestAdapter" Version="4.1.0" />
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<PackageVersion Include="MSTest.TestFramework" Version="4.1.0" />
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<PackageVersion Include="System.CommandLine.DragonFruit" Version="0.4.0-alpha.23407.1" />
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<!-- Reference-only packages for test framework namespace resolution in analyzer tests -->
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<PackageVersion Include="xunit.v3.core" Version="3.2.2" />
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<PackageVersion Include="NUnit" Version="4.5.1" />
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<PackageVersion Include="TUnit.Core" Version="1.19.22" />
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</ItemGroup>
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</Project>

‎IntelliTect.Analyzer/IntelliTect.Analyzer.Test/Helpers/DiagnosticVerifier.Helper.cs‎

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@@ -184,6 +184,11 @@ private static Project CreateProject(string[] sources, string language = Languag
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{
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solution = solution.AddMetadataReference(projectId, _SystemRuntimeReference);
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}
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foreach (MetadataReference frameworkReference in TestFrameworkReferences.AllReferences)
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{
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solution = solution.AddMetadataReference(projectId, frameworkReference);
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}
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}
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int count = 0;

‎IntelliTect.Analyzer/IntelliTect.Analyzer.Test/Helpers/TestFrameworkReferences.cs‎

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using System.Collections.Generic;
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using System.Linq;
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using Microsoft.CodeAnalysis;
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namespace TestHelper
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{
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/// <summary>
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/// Registry of supported test frameworks for analyzer testing.
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/// Used both to inject real assembly references into in-memory Roslyn compilations
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/// and as data source for parameterized tests via [DynamicData].
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///
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/// To add a new test framework: add one entry to <see cref="All"/>,
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/// add the NuGet package to Directory.Packages.props and the test .csproj
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/// (with IncludeAssets="compile" PrivateAssets="all"), and add the namespace
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/// to <see cref="IntelliTect.Analyzer.Analyzers.NamingMethodPascal"/>'s namespace list.
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/// </summary>
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public static class TestFrameworkReferences
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{
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public record TestFramework(
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string Name,
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string TestAttribute,
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string UsingDirective,
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MetadataReference Reference);
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public static IReadOnlyList<TestFramework> All { get; } =
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[
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new("MSTest",
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"[TestMethod]",
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"using Microsoft.VisualStudio.TestTools.UnitTesting;",
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MetadataReference.CreateFromFile(
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typeof(Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute).Assembly.Location)),
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new("xUnit",
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"[Fact]",
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"using Xunit;",
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MetadataReference.CreateFromFile(
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typeof(Xunit.FactAttribute).Assembly.Location)),
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new("NUnit",
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"[Test]",
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"using NUnit.Framework;",
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MetadataReference.CreateFromFile(
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typeof(NUnit.Framework.TestAttribute).Assembly.Location)),
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new("TUnit",
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"[Test]",
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"using TUnit.Core;",
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MetadataReference.CreateFromFile(
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typeof(TUnit.Core.TestAttribute).Assembly.Location)),
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];
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/// <summary>All test framework assembly references, for use in <see cref="DiagnosticVerifier"/>.</summary>
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public static MetadataReference[] AllReferences =>
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[.. All.Select(f => f.Reference)];
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}
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}

‎IntelliTect.Analyzer/IntelliTect.Analyzer.Test/IntelliTect.Analyzer.Tests.csproj‎

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<PackageReference Include="Microsoft.NET.Test.Sdk" />
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<PackageReference Include="MSTest.TestAdapter" />
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<PackageReference Include="MSTest.TestFramework" />
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<!-- Reference-only: provides DLLs for MetadataReference in tests; no runner/analyzer assets -->
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<PackageReference Include="xunit.v3.core">
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<IncludeAssets>compile;runtime</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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<PackageReference Include="NUnit">
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<IncludeAssets>compile;runtime</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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<PackageReference Include="TUnit.Core">
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<IncludeAssets>compile;runtime</IncludeAssets>
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<PrivateAssets>all</PrivateAssets>
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</PackageReference>
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</ItemGroup>
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<ItemGroup>

‎IntelliTect.Analyzer/IntelliTect.Analyzer.Test/NamingMethodPascalTests.cs‎

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using System.Threading.Tasks;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using Microsoft.CodeAnalysis;
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using Microsoft.CodeAnalysis.CodeFixes;
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using Microsoft.CodeAnalysis.Diagnostics;
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VerifyCSharpDiagnostic(test, expected1, expected2);
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}
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public static IEnumerable<object[]> TestFrameworks =>
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TestFrameworkReferences.All.Select(f => new object[] { f.Name, f.TestAttribute, f.UsingDirective });
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[TestMethod]
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[DynamicData(nameof(TestFrameworks))]
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[Description("Issue 371 - Test method with underscores should not trigger INTL0003 for any supported framework")]
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public void TestMethodWithUnderscores_TestFrameworkAttribute_NoDiagnosticInformationReturned(
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string frameworkName, string testAttribute, string usingDirective)
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{
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_ = frameworkName; // parameter used for test identification in output
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string test = $@"
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using System;
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{usingDirective}
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namespace ConsoleApplication1
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{{
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public class TypeName
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{{
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{testAttribute}
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public void FooThing_IsFooThing_HasFooThing() {{ }}
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}}
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}}";
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VerifyCSharpDiagnostic(test);
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}
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[TestMethod]
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[Description("Issue 371 - Non-test method with underscores in a test class should still trigger INTL0003")]
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public void NonTestMethodWithUnderscores_InTestClass_DiagnosticReturned()
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{
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string test = @"
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using System;
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using Xunit;
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namespace ConsoleApplication1
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{
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public class TypeName
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{
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[Fact]
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public void FooThing_IsFooThing_HasFooThing() { }
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public void helper_setup() { }
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}
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}";
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var expected = new DiagnosticResult
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{
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Id = "INTL0003",
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Message = "Method 'helper_setup' should be PascalCase",
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Severity = DiagnosticSeverity.Warning,
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Locations =
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[
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new DiagnosticResultLocation("Test0.cs", 12, 25)
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]
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};
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VerifyCSharpDiagnostic(test, expected);
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}
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[TestMethod]
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[Description("Issue 371 - User-defined attribute named 'Test' in a non-framework namespace must not suppress INTL0003")]
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public void MethodWithUnderscores_UserDefinedTestAttribute_DiagnosticReturned()
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{
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string test = @"
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using System;
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namespace MyApp
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{
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public class TestAttribute : System.Attribute { }
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}
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namespace ConsoleApplication1
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{
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public class TypeName
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{
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[MyApp.Test]
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public void FooThing_IsFooThing_HasFooThing() { }
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}
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}";
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var expected = new DiagnosticResult
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{
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Id = "INTL0003",
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Message = "Method 'FooThing_IsFooThing_HasFooThing' should be PascalCase",
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Severity = DiagnosticSeverity.Warning,
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Locations =
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[
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new DiagnosticResultLocation("Test0.cs", 14, 25)
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]
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};
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VerifyCSharpDiagnostic(test, expected);
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}
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protected override CodeFixProvider GetCSharpCodeFixProvider()
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{

‎IntelliTect.Analyzer/IntelliTect.Analyzer/Analyzers/NamingMethodPascal.cs‎

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return;
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}
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// Skip test methods - they commonly use underscores for readability (e.g., "Method_Scenario_ExpectedResult")
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if (IsTestMethod(namedTypeSymbol))
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{
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return;
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}
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Diagnostic diagnostic = Diagnostic.Create(_Rule, namedTypeSymbol.Locations[0], name);
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context.ReportDiagnostic(diagnostic);
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}
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// Test framework namespaces — any method decorated with an attribute whose namespace
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// exactly matches or starts with one of these is exempt from PascalCase validation.
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// To add a new framework, append its root namespace here and update TestFrameworkReferences.cs.
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private static readonly string[] _TestFrameworkNamespaces =
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[
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"Xunit", // xUnit (namespace is "Xunit", not "XUnit")
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"NUnit.Framework", // NUnit
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"Microsoft.VisualStudio.TestTools.UnitTesting", // MSTest
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"TUnit.Core" // TUnit
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];
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private static bool IsTestMethod(IMethodSymbol methodSymbol)
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{
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ImmutableArray<AttributeData> attributes = methodSymbol.GetAttributes();
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return attributes.Any(attribute =>
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{
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if (attribute.AttributeClass == null)
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{
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return false;
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}
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string? containingNamespace = attribute.AttributeClass.ContainingNamespace?.ToDisplayString();
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return containingNamespace != null &&
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_TestFrameworkNamespaces.Any(ns =>
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string.Equals(containingNamespace, ns, StringComparison.Ordinal) ||
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containingNamespace.StartsWith(ns + ".", StringComparison.Ordinal));
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});
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}
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}
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}

‎docs/analyzers/00XX.Naming.md‎

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Methods, including local functions, should be PascalCase
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**Note:** Test methods decorated with test framework attributes from xUnit, NUnit, MSTest, or TUnit are exempt from this rule, as they commonly use underscores for readability (e.g., `Method_Scenario_ExpectedResult`). Any attribute from these framework namespaces will be recognized automatically.
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**Allowed**
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```c#
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class SomeClass
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}
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```
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**Allowed (Test Methods)**
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```c#
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[TestClass]
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public class SomeClassTests
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{
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[TestMethod]
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public void GetEmpty_WhenCalled_ReturnsEmptyString()
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{
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// Test implementation
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}
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}
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```
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**Disallowed**
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```c#
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class SomeClass

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