Split off CodeFixes from analyzer

build.cake

@@ -28,12 +28,14 @@ var PACKAGE_DIR = PROJECT_DIR + "package/" + configuration;
 
 var ANALYZERS_TESTS_OUTPUT_DIR = SRC_DIR + "nunit.analyzers.tests/bin/";
 var ANALYZERS_OUTPUT_DIR = SRC_DIR + "nunit.analyzers/bin/";
+var CODEFIXES_OUTPUT_DIR = SRC_DIR + "nunit.analyzers.codefixes/bin/";
 
 // Solution
 var SOLUTION_FILE = PROJECT_DIR + "src/nunit.analyzers.sln";
 
 // Projects
 var ANALYZER_PROJECT = SRC_DIR + "nunit.analyzers/nunit.analyzers.csproj";
+var CODEFIXES_PROJECT = SRC_DIR + "nunit.analyzers.codefixes/nunit.analyzers.codefixes.csproj";
 var TEST_PROJECT = SRC_DIR + "nunit.analyzers.tests/nunit.analyzers.tests.csproj";
 
 // Package sources for nuget restore
@@ -103,6 +105,7 @@ Task("Clean")
     .Does(() =>
     {
         CleanDirectory(ANALYZERS_TESTS_OUTPUT_DIR);
+        CleanDirectory(CODEFIXES_OUTPUT_DIR);
         CleanDirectory(ANALYZERS_OUTPUT_DIR);
     });
 
@@ -128,7 +131,7 @@ Task("Build")
     .IsDependentOn("RestorePackages")
     .Does(() =>
     {
-        DotNetBuild(ANALYZER_PROJECT, new DotNetBuildSettings
+        var buildSettings = new DotNetBuildSettings
         {
             Configuration = configuration,
             Verbosity = DotNetVerbosity.Minimal,
@@ -138,7 +141,9 @@ Task("Build")
                 Version = packageVersion,
                 FileVersion = packageVersion,
             }
-        });
+        };
+        DotNetBuild(ANALYZER_PROJECT, buildSettings);
+        DotNetBuild(CODEFIXES_PROJECT, buildSettings);
     });
 
 //////////////////////////////////////////////////////////////////////
@@ -192,7 +197,7 @@ Task("Pack")
     .IsDependentOn("Build")
     .Does(() =>
     {
-        NuGetPack("./src/nunit.analyzers/nunit.analyzers.nuspec", new NuGetPackSettings()
+        NuGetPack("./src/nunit.analyzers.nuspec", new NuGetPackSettings()
         {
             Version = packageVersionString,
             OutputDirectory = PACKAGE_DIR + "/" + targetFramework,

src/Directory.Build.props

@@ -6,6 +6,8 @@
     <Company>NUnit Project</Company>
     <Product>NUnit Analyzers</Product>
     <Copyright>Copyright © 2018-2025 NUnit project</Copyright>
+    <!-- https://docs.microsoft.com/en-us/nuget/reference/nuspec#developmentdependency -->
+    <developmentDependency>true</developmentDependency>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -14,16 +16,24 @@
     <LangVersion>preview</LangVersion>
     <!-- Counter intuitive, but this only enabled the pre-shipped analyzer, we configure them below -->
     <EnableNETAnalyzers>false</EnableNETAnalyzers>
+    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
     <EnforceCodeStyleInBuild>false</EnforceCodeStyleInBuild>
     <AnalysisMode>AllEnabledByDefault</AnalysisMode>
-    <AnalysisLevel>5</AnalysisLevel>
-    <NoWarn>$(NoWarn);CA1014</NoWarn>
+    <AnalysisLevel>8</AnalysisLevel>
+    <NoWarn>$(NoWarn);CA1014;CS1591</NoWarn>
   </PropertyGroup>
 
+  <PropertyGroup>
+      <!--
+      No we shouldn't create documentation files for analyzers, but it is needed
+      to enable IDE0005 (Remove unnecessary usings/imports) on build (https://github.com/dotnet/roslyn/issues/41640)
+      -->
+      <GenerateDocumentationFile>true</GenerateDocumentationFile>
+  </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="StyleCop.Analyzers.Unstable" Version="1.2.0.556" PrivateAssets="all" />
     <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0" PrivateAssets="all" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeStyle" Version="3.11.0" PrivateAssets="all" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.CodeStyle" Version="4.10.0" PrivateAssets="all" />
     <PackageReference Include="CSharpIsNullAnalyzer" Version="0.1.593" PrivateAssets="all" />
   </ItemGroup>
 
@@ -39,6 +49,7 @@
 
   <ItemGroup>
     <InternalsVisibleTo Include="nunit.analyzers.tests" />
+    <InternalsVisibleTo Include="nunit.analyzers.codefixes" />
   </ItemGroup>
 
 </Project>

src/nunit.analyzers/ClassicModelAssertUsage/AreEqualClassicModelAssertUsageCodeFix.cs → src/nunit.analyzers.codefixes/ClassicModelAssertUsage/AreEqualClassicModelAssertUsageCodeFix.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Composition;

src/nunit.analyzers/ConstraintUsage/BaseConditionConstraintCodeFix.cs → src/nunit.analyzers.codefixes/ConstraintUsage/BaseConditionConstraintCodeFix.cs

@@ -141,7 +141,7 @@ protected virtual (ExpressionSyntax? actual, ExpressionSyntax? constraintExpress
             {
                 actualArgumentWithCorrectTrivia,
                 constraintArgumentWithCorrectTrivia
-            }.Union(remainingArguments);
+            }.Concat(remainingArguments);
 
             var newArgumentsList = assertNode.ArgumentList.WithArguments(newArguments);
 

src/nunit.analyzers/Extensions/ArgumentListSyntaxExtensions.cs → src/nunit.analyzers.codefixes/Extensions/ArgumentListSyntaxExtensions.cs

@@ -13,6 +13,10 @@ public static ArgumentListSyntax WithArguments(
             this ArgumentListSyntax @this,
             IEnumerable<ArgumentSyntax> newArguments)
         {
+            using var enumerator = newArguments.GetEnumerator();
+            if (!enumerator.MoveNext())
+                return @this;
+
             var originalArguments = @this.Arguments;
             var originalSeparators = originalArguments.GetSeparators().ToArray();
 
@@ -29,10 +33,12 @@ public static ArgumentListSyntax WithArguments(
             // or any of the original separators had a trailing newline.
             var shouldAddTrailingNewlineAfterComma = TryGetFirstEndOfLineTrivia(@this.OpenParenToken, originalSeparators, out var trailingTrivia);
 
-            var nodesAndTokens = new List<SyntaxNodeOrToken> { newArguments.First() };
+            var nodesAndTokens = new List<SyntaxNodeOrToken> { enumerator.Current };
 
-            foreach (var newArgument in newArguments.Skip(1))
+            while (enumerator.MoveNext())
             {
+                var newArgument = enumerator.Current;
+
                 // If argument is not replaced - take original separator. Otherwise - comma
                 var oldIndex = originalArguments.IndexOf(newArgument);
                 var separator = originalSeparators.ElementAtOrDefault(oldIndex - 1);

src/nunit.analyzers/Helpers/CodeFixHelper.cs → src/nunit.analyzers.codefixes/Helpers/CodeFixHelper.cs

@@ -107,6 +107,7 @@ internal static class CodeFixHelper
         /// </summary>
         /// <param name="arguments">The arguments passed to the 'Assert' method. </param>
         /// <param name="minimumNumberOfArguments">The argument needed for the actual method, any more are assumed messages.</param>
+        /// <param name="argsIsArray">The params args is passed as an array instead of individual parameters.</param>
         public static void UpdateStringFormatToFormattableString(List<ArgumentSyntax> arguments, int minimumNumberOfArguments, bool argsIsArray)
         {
             // If only 1 extra argument is passed, it must be a non-formattable message.

src/nunit.analyzers.codefixes/nunit.analyzers.codefixes.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <RootNamespace>NUnit.Analyzers</RootNamespace>
+    <TargetFrameworks>netstandard2.0</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="../nunit.analyzers/nunit.analyzers.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="3.11.0" />
+  </ItemGroup>
+
+</Project>

src/nunit.analyzers/nunit.analyzers.nuspec → src/nunit.analyzers.nuspec

@@ -25,10 +25,11 @@ Version 3.0 and upwards works in Visual Studio 2019 (version 16.3) or newer and
   </metadata>
   <!-- The convention for analyzers is to put language agnostic dlls in analyzers\portable50 and language specific analyzers in either analyzers\portable50\cs or analyzers\portable50\vb -->
   <files>
-    <file src="bin\$Configuration$\$TargetFramework$\nunit.analyzers.dll" target="analyzers\dotnet\cs\" />
+    <file src="nunit.analyzers\bin\$Configuration$\$TargetFramework$\nunit.analyzers.dll" target="analyzers\dotnet\cs\" />
+    <file src="nunit.analyzers.codefixes\bin\$Configuration$\$TargetFramework$\nunit.analyzers.codefixes.dll" target="analyzers\dotnet\cs\" />
     <file src="tools\*.ps1" target="tools\" />
-    <file src="..\..\license.txt" target="" />
-    <file src="..\..\nunit_256.png" target="images" />
-    <file src="..\..\README.md" target="docs" />
+    <file src="..\license.txt" target="" />
+    <file src="..\nunit_256.png" target="images" />
+    <file src="..\README.md" target="docs" />
   </files>
 </package>

src/nunit.analyzers.sln

@@ -112,6 +112,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 		..\global.json = ..\global.json
 	EndProjectSection
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "nunit.analyzers.codefixes", "nunit.analyzers.codefixes\nunit.analyzers.codefixes.csproj", "{E77F7B58-BD1F-48F6-BB6A-E55CCE12C714}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -126,6 +128,10 @@ Global
 		{070974CB-B483-4347-BA5A-53ED977E639C}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{070974CB-B483-4347-BA5A-53ED977E639C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{070974CB-B483-4347-BA5A-53ED977E639C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E77F7B58-BD1F-48F6-BB6A-E55CCE12C714}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E77F7B58-BD1F-48F6-BB6A-E55CCE12C714}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E77F7B58-BD1F-48F6-BB6A-E55CCE12C714}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E77F7B58-BD1F-48F6-BB6A-E55CCE12C714}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/nunit.analyzers.tests/.editorconfig

@@ -0,0 +1,14 @@
+# C# files
+[*.cs]
+
+# Not relevant for single execution unit tests
+
+# CA1861: Avoid constant arrays as arguments
+dotnet_diagnostic.CA1861.severity = none
+
+# CA1859: Use concrete types when possible for improved performance
+dotnet_diagnostic.CA1859.severity = none
+
+# CA1863 Cache a 'CompositeFormat' for repeated use in this formatting operation
+dotnet_diagnostic.CA1863.severity = none
+

src/nunit.analyzers.tests/CollectionAssertUsage/CollectionAssertUsageAnalyzerTests.cs

@@ -1,7 +1,6 @@
 using System.Collections.Generic;
 using Gu.Roslyn.Asserts;
 using Microsoft.CodeAnalysis.Diagnostics;
-using NUnit.Analyzers.ClassicModelAssertUsage;
 using NUnit.Analyzers.CollectionAssertUsage;
 using NUnit.Analyzers.Constants;
 using NUnit.Framework;

src/nunit.analyzers.tests/DiagnosticSuppressors/AvoidUninstantiatedInternalClassesSuppressorTests.cs

@@ -63,8 +63,6 @@ public void OneTimeSetUp()
             Assembly netAnalyzerAssembly = Assembly.LoadFrom(netAnalyzersPath);
             Type analyzerType = netAnalyzerAssembly.GetType("Microsoft.CodeQuality.CSharp.Analyzers.Maintainability.CSharpAvoidUninstantiatedInternalClasses", true)!;
             this.analyzer = (DiagnosticAnalyzer)Activator.CreateInstance(analyzerType)!;
-
-            this.analyzer = new DefaultEnabledAnalyzer(this.analyzer);
         }
 
         [Test]

src/nunit.analyzers.tests/DiagnosticSuppressors/DisposableFieldsSuppressorTests.cs

@@ -23,8 +23,6 @@ public void OneTimeSetUp()
             Assembly netAnalyzerAssembly = Assembly.LoadFrom(netAnalyzersPath);
             Type analyzerType = netAnalyzerAssembly.GetType("Microsoft.CodeQuality.Analyzers.ApiDesignGuidelines.TypesThatOwnDisposableFieldsShouldBeDisposableAnalyzer", true)!;
             this.analyzer = (DiagnosticAnalyzer)Activator.CreateInstance(analyzerType)!;
-
-            this.analyzer = new DefaultEnabledAnalyzer(this.analyzer);
         }
 
         [Test]

src/nunit.analyzers.tests/SetUpFixture.cs

@@ -19,7 +19,8 @@ public void SetDefaults()
                 .WithMetadataReferences(MetadataReferences.Transitive(typeof(Assert), typeof(ClassicAssert)))
                 .WithParseOption(new CSharpParseOptions(LanguageVersion.Preview).WithPreprocessorSymbols("NUNIT4"));
 #else
-                .WithMetadataReferences(MetadataReferences.Transitive(typeof(Assert)));
+                .WithMetadataReferences(MetadataReferences.Transitive(typeof(Assert)))
+                .WithParseOption(new CSharpParseOptions(LanguageVersion.Preview).WithPreprocessorSymbols("NUNIT3"));
 #endif
         }
     }

src/nunit.analyzers.tests/TestHelpers.cs

@@ -32,7 +32,8 @@ internal static async Task SuppressedOrNot(DiagnosticAnalyzer analyzer, Diagnost
             Assert.That(suppressor.SupportedSuppressions.Select(x => x.SuppressedDiagnosticId), Does.Contain(id));
 
             settings ??= Settings.Default;
-            settings = settings.WithCompilationOptions(Settings.Default.CompilationOptions.WithWarningOrError(analyzer.SupportedDiagnostics));
+            settings = settings.WithCompilationOptions(Settings.Default.CompilationOptions.WithWarningOrError(analyzer.SupportedDiagnostics))
+                               .WithAnalyzerConfig($"dotnet_diagnostic.{id}.severity = error");
 
             Compilation compilation = CreateCompilation(code, settings);
 

src/nunit.analyzers.tests/nunit.analyzers.tests.csproj

@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.1.0" />
   </ItemGroup>
-  
+
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="Gu.Roslyn.Asserts" Version="4.3.0" />
@@ -31,6 +31,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\nunit.analyzers\nunit.analyzers.csproj" OutputItemType="Analyzer" />
+    <ProjectReference Include="..\nunit.analyzers.codefixes\nunit.analyzers.codefixes.csproj"  OutputItemType="Analyzer" />
   </ItemGroup>
 
 </Project>

src/nunit.analyzers/DiagnosticSuppressors/AvoidUninstantiatedInternalClassSuppressor.cs

@@ -1,5 +1,4 @@
 using System.Collections.Immutable;
-using System.Linq;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;

src/nunit.analyzers/DiagnosticSuppressors/DereferencePossiblyNullReferenceSuppressor.cs

@@ -188,7 +188,7 @@ arrayType.ElementType is ITypeParameterSymbol typeParameter &&
         /// <remarks>
         /// We only try to detect simple cases where the operands being tested for <see langword="null"/> is one of the operands being returned:
         /// <code>variable is not null ? variable : otherExpression</code>
-        /// </para>
+        /// <para />
         /// We recognize the 'is' pattern operations and normal equality.
         /// </remarks>
         /// <param name="conditionalExpression">Conditional expression to investigate.</param>

src/nunit.analyzers/DiagnosticSuppressors/TypesThatOwnDisposableFieldsShouldBeDisposableSuppressor.cs

@@ -1,5 +1,4 @@
 using System.Collections.Immutable;
-using System.Linq;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Microsoft.CodeAnalysis.Diagnostics;

src/nunit.analyzers/Extensions/ITypeSymbolExtensions.cs

@@ -185,6 +185,7 @@ internal static bool IsAwaitable(this ITypeSymbol @this,
         /// <summary>
         /// Return value indicates whether type implements IEnumerable interface.
         /// </summary>
+        /// <param name="this">The <see cref="ITypeSymbol"/> to check.</param>
         /// <param name="elementType">Contains IEnumerable generic argument, or null, if type implements
         /// only non-generic IEnumerable interface, or no IEnumerable interface at all.</param>
         internal static bool IsIEnumerable(this ITypeSymbol @this, out ITypeSymbol? elementType)
@@ -219,6 +220,7 @@ internal static bool IsIEnumerable(this ITypeSymbol @this, out ITypeSymbol? elem
         /// <summary>
         /// Return value indicates whether type implements I(Async)Enumerable{T} interface.
         /// </summary>
+        /// <param name="this">The <see cref="ITypeSymbol"/> to check.</param>
         /// <param name="elementType">Contains I(Async)Enumerable generic argument, or null, if type implements
         /// only non-generic IEnumerable interface, or no I(Async)Enumerable interface at all.</param>
         internal static bool IsIEnumerableOrIAsyncEnumerable(this ITypeSymbol @this, out ITypeSymbol? elementType)

src/nunit.analyzers/Helpers/NUnitEqualityComparerHelper.cs

@@ -11,7 +11,7 @@ namespace NUnit.Analyzers.Helpers
     internal static class NUnitEqualityComparerHelper
     {
         /// <summary>
-        /// Returns true if it is possible that <see cref="NUnit.Framework.Constraints.NUnitEqualityComparer.AreEqual"/>
+        /// Returns true if it is possible that "NUnit.Framework.Constraints.NUnitEqualityComparer.AreEqual"
         /// returns true for given argument types.
         /// False otherwise.
         /// </summary>

src/nunit.analyzers/MissingProperty/MissingPropertyAnalyzer.cs

@@ -71,7 +71,9 @@ protected override void AnalyzeAssertInvocation(OperationAnalysisContext context
                     continue;
                 }
 
-                var propertyMembers = actualType.GetAllMembers().Where(m => m.Kind == SymbolKind.Property);
+                var propertyMembers = actualType.GetAllMembers()
+                                                .Where(m => m.Kind == SymbolKind.Property)
+                                                .ToArray();
                 if (!propertyMembers.Any(m => m.Name == propertyName))
                 {
                     var properties = propertyMembers.Select(p => p.Name).Distinct().ToImmutableDictionary(p => p, p => (string?)p);