Generate and validate derived test classes

StyleCop.Analyzers/StyleCop.Analyzers.CodeGeneration/StyleCop.Analyzers.CodeGeneration.csproj

@@ -2,8 +2,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>netstandard2.0</TargetFrameworks>
-    <Nullable>enable</Nullable>
+    <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup>

StyleCop.Analyzers/StyleCop.Analyzers.PrivateAnalyzers/DerivedTestGenerator.cs

@@ -0,0 +1,167 @@
+// Copyright (c) Tunnel Vision Laboratories, LLC. All Rights Reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+namespace StyleCop.Analyzers.PrivateAnalyzers
+{
+    using System;
+    using System.Collections.Immutable;
+    using System.Linq;
+    using System.Text.RegularExpressions;
+    using Microsoft.CodeAnalysis;
+
+    [Generator]
+    internal sealed class DerivedTestGenerator : IIncrementalGenerator
+    {
+        public void Initialize(IncrementalGeneratorInitializationContext context)
+        {
+            var testData = context.CompilationProvider.Select((compilation, cancellationToken) =>
+            {
+                var currentAssemblyName = compilation.AssemblyName ?? string.Empty;
+                if (!Regex.IsMatch(currentAssemblyName, @"^StyleCop\.Analyzers\.Test\.CSharp\d+$"))
+                {
+                    // This is not a test project where derived test classes are expected
+                    return null;
+                }
+
+                var currentVersion = int.Parse(currentAssemblyName["StyleCop.Analyzers.Test.CSharp".Length..]);
+                var currentTestString = "CSharp" + currentVersion;
+                var previousTestString = currentVersion switch
+                {
+                    7 => string.Empty,
+                    _ => "CSharp" + (currentVersion - 1).ToString(),
+                };
+                var previousAssemblyName = previousTestString switch
+                {
+                    "" => "StyleCop.Analyzers.Test",
+                    _ => "StyleCop.Analyzers.Test." + previousTestString,
+                };
+
+                return new TestData(previousTestString, previousAssemblyName, currentTestString, currentAssemblyName);
+            });
+
+            var testTypes = context.CompilationProvider.Combine(testData).SelectMany((compilationAndTestData, cancellationToken) =>
+            {
+                var (compilation, testData) = compilationAndTestData;
+                if (testData is null)
+                {
+                    return ImmutableArray<string>.Empty;
+                }
+
+                var previousAssembly = compilation.Assembly.Modules.First().ReferencedAssemblySymbols.First(
+                    symbol => symbol.Identity.Name == testData.PreviousAssemblyName);
+                if (previousAssembly is null)
+                {
+                    return ImmutableArray<string>.Empty;
+                }
+
+                var collector = new TestClassCollector(testData.PreviousTestString);
+                var previousTests = collector.Visit(previousAssembly);
+                return previousTests.ToImmutableArray();
+            });
+
+            context.RegisterSourceOutput(
+                testTypes.Combine(testData),
+                (context, testTypeAndData) =>
+                {
+                    var (testType, testData) = testTypeAndData;
+                    if (testData is null)
+                    {
+                        throw new InvalidOperationException("Not reachable");
+                    }
+
+                    string expectedTest;
+                    if (testData.PreviousTestString is "")
+                    {
+                        expectedTest = testType.Replace(testData.PreviousAssemblyName, testData.CurrentAssemblyName).Replace("UnitTests", testData.CurrentTestString + "UnitTests");
+                    }
+                    else
+                    {
+                        expectedTest = testType.Replace(testData.PreviousTestString, testData.CurrentTestString);
+                    }
+
+                    var lastDot = testType.LastIndexOf('.');
+                    var baseNamespaceName = testType["global::".Length..lastDot];
+                    var baseTypeName = testType[(lastDot + 1)..];
+
+                    lastDot = expectedTest.LastIndexOf('.');
+                    var namespaceName = expectedTest["global::".Length..lastDot];
+                    var typeName = expectedTest[(lastDot + 1)..];
+                    var content =
+                        $@"// <auto-generated/>
+
+#nullable enable
+
+namespace {namespaceName};
+
+using {baseNamespaceName};
+
+public partial class {typeName}
+    : {baseTypeName}
+{{
+}}
+";
+
+                    context.AddSource(
+                        typeName + ".cs",
+                        content);
+                });
+        }
+
+        private sealed record TestData(string PreviousTestString, string PreviousAssemblyName, string CurrentTestString, string CurrentAssemblyName);
+
+        private sealed class TestClassCollector : SymbolVisitor<ImmutableSortedSet<string>>
+        {
+            private readonly string testString;
+
+            public TestClassCollector(string testString)
+            {
+                this.testString = testString;
+            }
+
+            public override ImmutableSortedSet<string> Visit(ISymbol? symbol)
+                => base.Visit(symbol) ?? throw new InvalidOperationException("Not reachable");
+
+            public override ImmutableSortedSet<string>? DefaultVisit(ISymbol symbol)
+                => ImmutableSortedSet<string>.Empty;
+
+            public override ImmutableSortedSet<string> VisitAssembly(IAssemblySymbol symbol)
+            {
+                return this.Visit(symbol.GlobalNamespace);
+            }
+
+            public override ImmutableSortedSet<string> VisitNamespace(INamespaceSymbol symbol)
+            {
+                var result = ImmutableSortedSet<string>.Empty;
+                foreach (var member in symbol.GetMembers())
+                {
+                    result = result.Union(this.Visit(member)!);
+                }
+
+                return result;
+            }
+
+            public override ImmutableSortedSet<string> VisitNamedType(INamedTypeSymbol symbol)
+            {
+                if (this.testString is "")
+                {
+                    if (symbol.Name.EndsWith("UnitTests"))
+                    {
+                        return ImmutableSortedSet.Create(symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+                    }
+                    else
+                    {
+                        return ImmutableSortedSet<string>.Empty;
+                    }
+                }
+                else if (symbol.Name.Contains(this.testString))
+                {
+                    return ImmutableSortedSet.Create(symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+                }
+                else
+                {
+                    return ImmutableSortedSet<string>.Empty;
+                }
+            }
+        }
+    }
+}

StyleCop.Analyzers/StyleCop.Analyzers.PrivateAnalyzers/IncludeTestClassesAnalyzer.cs

@@ -0,0 +1,156 @@
+// Copyright (c) Tunnel Vision Laboratories, LLC. All Rights Reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+namespace StyleCop.Analyzers.PrivateAnalyzers;
+
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text.RegularExpressions;
+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.Diagnostics;
+using Microsoft.CodeAnalysis.Text;
+
+[DiagnosticAnalyzer(LanguageNames.CSharp)]
+internal sealed class IncludeTestClassesAnalyzer : DiagnosticAnalyzer
+{
+    private static readonly DiagnosticDescriptor Descriptor =
+        new(PrivateDiagnosticIds.SP0001, "Include all test classes", "Expected test class '{0}' was not found", "Correctness", DiagnosticSeverity.Warning, isEnabledByDefault: true, customTags: new[] { "CompilationEnd" });
+
+    public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics { get; } = ImmutableArray.Create(Descriptor);
+
+    public override void Initialize(AnalysisContext context)
+    {
+        context.ConfigureGeneratedCodeAnalysis(GeneratedCodeAnalysisFlags.None);
+        context.EnableConcurrentExecution();
+
+        context.RegisterCompilationStartAction(context =>
+        {
+            var assemblyName = context.Compilation.AssemblyName ?? string.Empty;
+            if (!Regex.IsMatch(assemblyName, @"^StyleCop\.Analyzers\.Test\.CSharp\d+$"))
+            {
+                // This is not a test project where derived test classes are expected
+                return;
+            }
+
+            // Map actual test class in current project to base type
+            var testClasses = new ConcurrentDictionary<string, string>();
+
+            context.RegisterSymbolAction(
+                context =>
+                {
+                    var namedType = (INamedTypeSymbol)context.Symbol;
+                    if (namedType.TypeKind != TypeKind.Class)
+                    {
+                        return;
+                    }
+
+                    testClasses[namedType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat)] = namedType.BaseType?.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat) ?? string.Empty;
+                },
+                SymbolKind.NamedType);
+
+            context.RegisterCompilationEndAction(context =>
+            {
+                var currentVersion = int.Parse(assemblyName["StyleCop.Analyzers.Test.CSharp".Length..]);
+                var currentTestString = "CSharp" + currentVersion;
+                var previousTestString = currentVersion switch
+                {
+                    7 => string.Empty,
+                    _ => "CSharp" + (currentVersion - 1).ToString(),
+                };
+                var previousAssemblyName = previousTestString switch
+                {
+                    "" => "StyleCop.Analyzers.Test",
+                    _ => "StyleCop.Analyzers.Test." + previousTestString,
+                };
+
+                var previousAssembly = context.Compilation.Assembly.Modules.First().ReferencedAssemblySymbols.First(
+                    symbol => symbol.Identity.Name == previousAssemblyName);
+                if (previousAssembly is null)
+                {
+                    return;
+                }
+
+                var reportingLocation = context.Compilation.SyntaxTrees.FirstOrDefault()?.GetLocation(new TextSpan(0, 0)) ?? Location.None;
+                var collector = new TestClassCollector(previousTestString);
+                var previousTests = collector.Visit(previousAssembly);
+                foreach (var previousTest in previousTests)
+                {
+                    string expectedTest;
+                    if (previousTestString is "")
+                    {
+                        expectedTest = previousTest.Replace(previousAssemblyName, assemblyName).Replace("UnitTests", currentTestString + "UnitTests");
+                    }
+                    else
+                    {
+                        expectedTest = previousTest.Replace(previousTestString, currentTestString);
+                    }
+
+                    if (testClasses.TryGetValue(expectedTest, out var actualTest)
+                        && actualTest == previousTest)
+                    {
+                        continue;
+                    }
+
+                    context.ReportDiagnostic(Diagnostic.Create(Descriptor, reportingLocation, expectedTest));
+                }
+            });
+        });
+    }
+
+    private sealed class TestClassCollector : SymbolVisitor<ImmutableSortedSet<string>>
+    {
+        private readonly string testString;
+
+        public TestClassCollector(string testString)
+        {
+            this.testString = testString;
+        }
+
+        public override ImmutableSortedSet<string> Visit(ISymbol? symbol)
+            => base.Visit(symbol) ?? throw new InvalidOperationException("Not reachable");
+
+        public override ImmutableSortedSet<string>? DefaultVisit(ISymbol symbol)
+            => ImmutableSortedSet<string>.Empty;
+
+        public override ImmutableSortedSet<string> VisitAssembly(IAssemblySymbol symbol)
+        {
+            return this.Visit(symbol.GlobalNamespace);
+        }
+
+        public override ImmutableSortedSet<string> VisitNamespace(INamespaceSymbol symbol)
+        {
+            var result = ImmutableSortedSet<string>.Empty;
+            foreach (var member in symbol.GetMembers())
+            {
+                result = result.Union(this.Visit(member)!);
+            }
+
+            return result;
+        }
+
+        public override ImmutableSortedSet<string> VisitNamedType(INamedTypeSymbol symbol)
+        {
+            if (this.testString is "")
+            {
+                if (symbol.Name.EndsWith("UnitTests"))
+                {
+                    return ImmutableSortedSet.Create(symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+                }
+                else
+                {
+                    return ImmutableSortedSet<string>.Empty;
+                }
+            }
+            else if (symbol.Name.Contains(this.testString))
+            {
+                return ImmutableSortedSet.Create(symbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat));
+            }
+            else
+            {
+                return ImmutableSortedSet<string>.Empty;
+            }
+        }
+    }
+}

StyleCop.Analyzers/StyleCop.Analyzers.PrivateAnalyzers/PrivateDiagnosticIds.cs

@@ -0,0 +1,13 @@
+// Copyright (c) Tunnel Vision Laboratories, LLC. All Rights Reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+namespace StyleCop.Analyzers.PrivateAnalyzers
+{
+    internal static class PrivateDiagnosticIds
+    {
+        /// <summary>
+        /// SP0001: Include all test classes.
+        /// </summary>
+        public const string SP0001 = nameof(SP0001);
+    }
+}

StyleCop.Analyzers/StyleCop.Analyzers.PrivateAnalyzers/StyleCop.Analyzers.PrivateAnalyzers.csproj

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <!-- RS2008: Enable analyzer release tracking -->
+    <NoWarn>$(NoWarn),RS2008</NoWarn>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <CodeAnalysisRuleSet>..\StyleCop.Analyzers.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>..\..\build\keys\StyleCopAnalyzers.snk</AssemblyOriginatorKeyFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.0.1" />
+    <PackageReference Include="TunnelVisionLabs.LanguageTypes.SourceGenerator" Version="0.1.20-beta" />
+    <PackageReference Include="TunnelVisionLabs.ReferenceAssemblyAnnotator" Version="1.0.0-alpha.160" PrivateAssets="all" />
+    <PackageDownload Include="Microsoft.NETCore.App.Ref" Version="[3.1.0]" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <!-- The .generated file is excluded by default, but we want to show the items in Solution Explorer so we included it as None -->
+    <None Include="Lightup\.generated\**" />
+  </ItemGroup>
+
+</Project>