Fix diagnostic suppressor, add tests

Author: Sergio0694

components/DependencyPropertyGenerator/CommunityToolkit.DependencyPropertyGenerator.SourceGenerators/Diagnostics/Suppressors/StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor.cs

@@ -46,7 +46,7 @@ public override void ReportSuppressions(SuppressionAnalysisContext context)
             SyntaxNode? syntaxNode = diagnostic.Location.SourceTree?.GetRoot(context.CancellationToken).FindNode(diagnostic.Location.SourceSpan);
 
             // Check that the target is effectively [static:] over a property declaration, which is the only case we are interested in
-            if (syntaxNode is AttributeTargetSpecifierSyntax { Parent: PropertyDeclarationSyntax propertyDeclaration, Identifier: SyntaxToken(SyntaxKind.StaticKeyword) })
+            if (syntaxNode is AttributeTargetSpecifierSyntax { Parent.Parent: PropertyDeclarationSyntax propertyDeclaration, Identifier: SyntaxToken(SyntaxKind.StaticKeyword) })
             {
                 SemanticModel semanticModel = context.GetSemanticModel(syntaxNode.SyntaxTree);
 

components/DependencyPropertyGenerator/CommunityToolkit.DependencyPropertyGenerator.Tests/Test_DiagnosticSuppressors.cs

@@ -0,0 +1,84 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Threading.Tasks;
+using CommunityToolkit.GeneratedDependencyProperty.Tests.Helpers;
+using Microsoft.CodeAnalysis.Testing;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace CommunityToolkit.GeneratedDependencyProperty.Tests;
+
+[TestClass]
+public class Test_DiagnosticSuppressors
+{
+    private static readonly DiagnosticResult CS0658 = DiagnosticResult.CompilerWarning("CS0658");
+
+    [TestMethod]
+    [DataRow("get")]
+    [DataRow("with")]
+    [DataRow("readonly")]
+    [DataRow("propdp")]
+    public async Task StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor_OtherTarget_NotSuppressed(string target)
+    {
+        await new CSharpSuppressorTest<StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor>(
+            $$"""
+            using System;
+            using CommunityToolkit.WinUI;
+            using Windows.UI.Xaml;
+
+            public class MyObject : DependencyObject
+            {
+                [GeneratedDependencyProperty]
+                [{{target}}: Test]
+                public string? Name { get; set; }
+            }
+
+            public class TestAttribute : Attribute;
+            """)
+            .WithSpecificDiagnostics(CS0658)
+            .RunAsync();
+    }
+
+    [TestMethod]
+    public async Task StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor_NoTriggerAttribute_NotSuppressed()
+    {
+        await new CSharpSuppressorTest<StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor>(
+            """
+            using System;
+            using Windows.UI.Xaml;
+
+            public class MyObject : DependencyObject
+            {
+                [static: Test]
+                public string? Name { get; set; }
+            }
+
+            public class TestAttribute : Attribute;
+            """)
+            .WithSpecificDiagnostics(CS0658)
+            .RunAsync();
+    }
+
+    [TestMethod]
+    public async Task StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor_ValidUse_Suppressed()
+    {
+        await new CSharpSuppressorTest<StaticAttributeListTargetOnGeneratedDependencyPropertyDeclarationSuppressor>(
+            """
+            using System;
+            using CommunityToolkit.WinUI;
+            using Windows.UI.Xaml;
+
+            public class MyObject : DependencyObject
+            {
+                [GeneratedDependencyProperty]
+                [static: Test]
+                public string? Name { get; set; }
+            }
+
+            public class TestAttribute : Attribute;
+            """)
+            .WithSpecificDiagnostics(CS0658)
+            .RunAsync();
+    }
+}