Update SA1130 for nullable reference types

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test.CSharp8/ReadabilityRules/SA1130CSharp8UnitTests.cs

@@ -3,9 +3,94 @@
 
 namespace StyleCop.Analyzers.Test.CSharp8.ReadabilityRules
 {
+    using System.Threading;
+    using System.Threading.Tasks;
     using StyleCop.Analyzers.Test.CSharp7.ReadabilityRules;
+    using Xunit;
+    using static StyleCop.Analyzers.Test.Verifiers.StyleCopCodeFixVerifier<
+        StyleCop.Analyzers.ReadabilityRules.SA1130UseLambdaSyntax,
+        StyleCop.Analyzers.ReadabilityRules.SA1130CodeFixProvider>;
 
     public partial class SA1130CSharp8UnitTests : SA1130CSharp7UnitTests
     {
+        [Fact]
+        [WorkItem(3006, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3006")]
+        public async Task TestDelegateInNullableEnabledGenericAsync()
+        {
+            var testCode = @"#nullable enable
+using System;
+
+public class TestClass
+{
+    public void TestMethod<T>() where T : class
+    {
+        Func<T?> resolve = {|#0:delegate|} { return default; };
+    }
+}
+";
+
+            var fixedCode = @"#nullable enable
+using System;
+
+public class TestClass
+{
+    public void TestMethod<T>() where T : class
+    {
+        Func<T?> resolve = () => { return default; };
+    }
+}
+";
+
+            await VerifyCSharpFixAsync(testCode, Diagnostic().WithLocation(0), fixedCode, CancellationToken.None).ConfigureAwait(false);
+        }
+
+        [Fact]
+        [WorkItem(3006, "https://github.com/DotNetAnalyzers/StyleCopAnalyzers/issues/3006")]
+        public async Task TestDelegateUsedAsNamedArgumentWithNullableTypesAsync()
+        {
+            var testCode = @"#nullable enable
+using System;
+using System.Linq;
+
+public class TestClass
+{
+    public void Test()
+    {
+        Invoke(resolve: {|#0:delegate|}
+        {
+            return """";
+        });
+    }
+
+    private void Invoke(string? description = null, Func<object?, string?> resolve = null!)
+    {
+        _ = resolve(0);
+    }
+}
+";
+
+            var fixedCode = @"#nullable enable
+using System;
+using System.Linq;
+
+public class TestClass
+{
+    public void Test()
+    {
+        Invoke(resolve: arg =>
+        {
+            return """";
+        });
+    }
+
+    private void Invoke(string? description = null, Func<object?, string?> resolve = null!)
+    {
+        _ = resolve(0);
+    }
+}
+";
+
+            await VerifyCSharpFixAsync(testCode, Diagnostic().WithLocation(0), fixedCode, CancellationToken.None).ConfigureAwait(false);
+        }
     }
 }