feat: Respect base properties (bUnit-dev#1572)

* feat: Respect base properties

* Update src/bunit.generators/Web.Stubs/MemberRetriever.cs

Co-authored-by: Egil Hansen <[email protected]>

---------

Co-authored-by: Egil Hansen <[email protected]>

src/bunit.generators/Web.Stubs/AddStubMethodStubGenerator/AddStubGenerator.cs

@@ -31,8 +31,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
 
 	private static AddStubClassInfo? GetStubClassInfo(GeneratorSyntaxContext context)
 	{
-		var invocation = context.Node as InvocationExpressionSyntax;
-		if (invocation is null || !IsComponentFactoryStubMethod(invocation, context.SemanticModel))
+		if (context.Node is not InvocationExpressionSyntax invocation || !IsComponentFactoryStubMethod(invocation, context.SemanticModel))
 		{
 			return null;
 		}
@@ -56,7 +55,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
 		var line = lineSpan.StartLinePosition.Line + 1;
 		var column = lineSpan.Span.Start.Character + context.Node.ToString().IndexOf("AddStub", StringComparison.Ordinal) + 1;
 
-		var properties = symbol.GetMembers()
+		var properties = symbol.GetAllMembersRecursively()
 				.OfType<IPropertySymbol>()
 				.Where(IsParameterOrCascadingParameter)
 				.Select(CreateFromProperty)

src/bunit.generators/Web.Stubs/AttributeStubGenerator/ComponentStubAttributeGenerator.cs

@@ -62,7 +62,7 @@ private static bool IsClassWithComponentStubAttribute(SyntaxNode s) =>
 			}
 
 			var parameter = attribute.AttributeClass!.TypeArguments
-				.SelectMany(s => s.GetMembers())
+				.SelectMany(s => s.GetAllMembersRecursively())
 				.OfType<IPropertySymbol>()
 				.Where(IsParameterOrCascadingParameter)
 				.Select(CreateFromProperty)

src/bunit.generators/Web.Stubs/MemberRetriever.cs

@@ -0,0 +1,19 @@
+using Microsoft.CodeAnalysis;
+
+namespace Bunit.Web.Stubs;
+
+internal static class MemberRetriever
+{
+	public static IEnumerable<ISymbol> GetAllMembersRecursively(this ITypeSymbol type)
+	{
+		var currentType = type;
+		while (currentType is not null)
+		{
+			foreach (var member in currentType.GetMembers())
+			{
+				yield return member;
+			}
+			currentType = currentType.BaseType;
+		}
+	}
+}

tests/bunit.generators.tests/Web.Stub/AddStubGeneratorTests.cs

@@ -61,7 +61,42 @@ public void Generated_stub_via_attribute_has_same_parameters()
 		var stub = cut.FindComponent<ButtonComponentStub>();
 		Assert.Equal("test", stub.Instance.Text);
 	}
+
+	[Fact]
+	public void Generated_Stub_respects_base_class_parameters()
+	{
+		ComponentFactories.AddStub<DerivedComponent>();
+
+		var cut = RenderComponent<ContainerComponent>(c => c.AddChildContent<DerivedComponent>());
+
+		var stub = cut.FindComponent<DerivedComponentStub>();
+		Assert.Equal(0, stub.Instance.BaseCount);
+	}
+
+	[Fact]
+	public void Generated_stub_via_attribute_respects_base_class_parameters()
+	{
+		ComponentFactories.Add<DerivedComponent, DerivedComponentStubViaAttributeAnnotation>();
+
+		var cut = RenderComponent<ContainerComponent>(c => c.AddChildContent<DerivedComponent>());
+
+		var stub = cut.FindComponent<DerivedComponentStubViaAttributeAnnotation>();
+		Assert.Equal(0, stub.Instance.BaseCount);
+	}
 }
 
 [ComponentStub<ButtonComponent>]
-public partial class ButtonComponentStub;
+public partial class ButtonComponentStub;
+
+public abstract class BaseComponent : ComponentBase
+{
+	[Parameter] public int BaseCount { get; set; }
+}
+
+public class DerivedComponent : BaseComponent
+{
+	[Parameter] public int DerivedCount { get; set; }
+}
+
+[ComponentStub<DerivedComponent>]
+public partial class DerivedComponentStubViaAttributeAnnotation;

tests/bunit.generators.tests/Web.Stub/Components/ContainerComponent.cs

@@ -0,0 +1,14 @@
+namespace Bunit.Web.Stub.Components;
+
+public class ContainerComponent : ComponentBase
+{
+	[Parameter]
+	public RenderFragment ChildContent { get; set; }
+
+	protected override void BuildRenderTree(RenderTreeBuilder builder)
+	{
+		builder.OpenElement(0, "div");
+		builder.AddContent(1, ChildContent);
+		builder.CloseElement();
+	}
+}