AV1755: Do not report on test methods

Fixes #112

Author: Bart Koelman

src/CSharpGuidelinesAnalyzer/CSharpGuidelinesAnalyzer.Test/Specs/Naming/SuffixAsyncMethodCorrectlySpecs.cs

@@ -194,6 +194,39 @@ static async Task Main(string[] args)
             VerifyGuidelineDiagnostic(source);
         }
 
+        [Fact]
+        internal void When_test_method_name_does_not_end_with_Async_it_must_be_skipped()
+        {
+            // Arrange
+            ParsedSourceCode source = new TypeSourceCodeBuilder()
+                .Using(typeof(Task).Namespace)
+                .InGlobalScope(@"
+                    namespace Xunit
+                    {
+                        public class FactAttribute : Attribute
+                        {
+                        }
+                    }
+
+                    namespace App
+                    {
+                        using Xunit;
+
+                        class UnitTests
+                        {
+                            [Fact]
+                            public async Task When_some_condition_it_must_work()
+                            {
+                            }
+                        }
+                    }
+                ")
+                .Build();
+
+            // Act and assert
+            VerifyGuidelineDiagnostic(source);
+        }
+
         protected override DiagnosticAnalyzer CreateAnalyzer()
         {
             return new SuffixAsyncMethodCorrectlyAnalyzer();

src/CSharpGuidelinesAnalyzer/CSharpGuidelinesAnalyzer/Rules/Naming/SuffixAsyncMethodCorrectlyAnalyzer.cs

@@ -69,7 +69,7 @@ private static bool RequiresReport([NotNull] IMethodSymbol method, [NotNull] Com
             CancellationToken cancellationToken)
         {
             return method.IsAsync && !method.Name.EndsWith("Async", StringComparison.Ordinal) && !method.IsSynthesized() &&
-                !method.IsEntryPoint(compilation, cancellationToken);
+                !method.IsUnitTestMethod() && !method.IsEntryPoint(compilation, cancellationToken);
         }
 
         private static void ReportAt([NotNull] IMethodSymbol method, [NotNull] Action<Diagnostic> reportDiagnostic)