Merge pull request #299 from sharwell/empty-analyzer

Provide a default EmptyDiagnosticAnalyzer

src/Microsoft.CodeAnalysis.Testing/Microsoft.CodeAnalysis.Analyzer.Testing/EmptyDiagnosticAnalyzer.cs

@@ -0,0 +1,22 @@
+// Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+
+using System.Collections.Immutable;
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.CodeAnalysis.Diagnostics;
+
+namespace Microsoft.CodeAnalysis.Testing
+{
+    /// <summary>
+    /// Defines a <see cref="DiagnosticAnalyzer"/> which does not report any diagnostics.
+    /// </summary>
+    [SuppressMessage("MicrosoftCodeAnalysisCorrectness", "RS1001:Missing diagnostic analyzer attribute.", Justification = "This helper type for unit testing is not language specific, and is never actually provided as an analyzer for projects to consume.")]
+    public sealed class EmptyDiagnosticAnalyzer : DiagnosticAnalyzer
+    {
+        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics
+            => ImmutableArray<DiagnosticDescriptor>.Empty;
+
+        public override void Initialize(AnalysisContext context)
+        {
+        }
+    }
+}

src/Microsoft.CodeAnalysis.Testing/Microsoft.CodeAnalysis.Analyzer.Testing/PublicAPI.Unshipped.txt

@@ -56,6 +56,8 @@ Microsoft.CodeAnalysis.Testing.DiagnosticResult.WithSeverity(Microsoft.CodeAnaly
 Microsoft.CodeAnalysis.Testing.DiagnosticResult.WithSpan(Microsoft.CodeAnalysis.FileLinePositionSpan span) -> Microsoft.CodeAnalysis.Testing.DiagnosticResult
 Microsoft.CodeAnalysis.Testing.DiagnosticResult.WithSpan(int startLine, int startColumn, int endLine, int endColumn) -> Microsoft.CodeAnalysis.Testing.DiagnosticResult
 Microsoft.CodeAnalysis.Testing.DiagnosticResult.WithSpan(string path, int startLine, int startColumn, int endLine, int endColumn) -> Microsoft.CodeAnalysis.Testing.DiagnosticResult
+Microsoft.CodeAnalysis.Testing.EmptyDiagnosticAnalyzer
+Microsoft.CodeAnalysis.Testing.EmptyDiagnosticAnalyzer.EmptyDiagnosticAnalyzer() -> void
 Microsoft.CodeAnalysis.Testing.IVerifier
 Microsoft.CodeAnalysis.Testing.IVerifier.Empty<T>(string collectionName, System.Collections.Generic.IEnumerable<T> collection) -> void
 Microsoft.CodeAnalysis.Testing.IVerifier.Equal<T>(T expected, T actual, string message = null) -> void
@@ -111,6 +113,8 @@ abstract Microsoft.CodeAnalysis.Testing.AnalyzerTest<TVerifier>.DefaultFileExt.g
 abstract Microsoft.CodeAnalysis.Testing.AnalyzerTest<TVerifier>.GetDiagnosticAnalyzers() -> System.Collections.Generic.IEnumerable<Microsoft.CodeAnalysis.Diagnostics.DiagnosticAnalyzer>
 abstract Microsoft.CodeAnalysis.Testing.AnalyzerTest<TVerifier>.Language.get -> string
 override Microsoft.CodeAnalysis.Testing.DiagnosticResult.ToString() -> string
+override Microsoft.CodeAnalysis.Testing.EmptyDiagnosticAnalyzer.Initialize(Microsoft.CodeAnalysis.Diagnostics.AnalysisContext context) -> void
+override Microsoft.CodeAnalysis.Testing.EmptyDiagnosticAnalyzer.SupportedDiagnostics.get -> System.Collections.Immutable.ImmutableArray<Microsoft.CodeAnalysis.DiagnosticDescriptor>
 static Microsoft.CodeAnalysis.Testing.AnalyzerTest<TVerifier>.GetSortedDiagnosticsAsync(Microsoft.CodeAnalysis.Solution solution, System.Collections.Immutable.ImmutableArray<Microsoft.CodeAnalysis.Diagnostics.DiagnosticAnalyzer> analyzers, Microsoft.CodeAnalysis.Testing.CompilerDiagnostics compilerDiagnostics, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.Task<System.Collections.Immutable.ImmutableArray<Microsoft.CodeAnalysis.Diagnostic>>
 static Microsoft.CodeAnalysis.Testing.AnalyzerTest<TVerifier>.Verify.get -> TVerifier
 static Microsoft.CodeAnalysis.Testing.AnalyzerVerifier<TAnalyzer, TTest, TVerifier>.Diagnostic() -> Microsoft.CodeAnalysis.Testing.DiagnosticResult