feat: support for all element types that can have an aria-labelledby

src/bunit.web.query/Labels/LabelQueryExtensions.cs

@@ -10,6 +10,7 @@ public static class LabelQueryExtensions
 		new LabelTextUsingForAttributeStrategy(),
 		new LabelTextUsingAriaLabelStrategy(),
 		new LabelTextUsingWrappedElementStrategy(),
+		new LabelTextUsingAriaLabelledByStrategy(),
 	};
 
 	/// <summary>

src/bunit.web.query/Labels/Strategies/LabelTextUsingAriaLabelledByStrategy.cs

@@ -0,0 +1,20 @@
+using AngleSharp.Dom;
+
+namespace Bunit;
+
+internal class LabelTextUsingAriaLabelledByStrategy : ILabelTextQueryStrategy
+{
+	public IElement? FindElement(IRenderedFragment renderedFragment, string labelText)
+	{
+		var elementsWithAriaLabelledBy = renderedFragment.FindAll("[aria-labelledby]");
+
+		foreach (var element in elementsWithAriaLabelledBy)
+		{
+			var labelElements = renderedFragment.FindAll($"#{element.GetAttribute("aria-labelledby")}");
+			if (labelElements.Count > 0 && labelElements[0].GetInnerText() == labelText)
+				return element;
+		}
+
+		return null;
+	}
+}

tests/bunit.testassets/BlazorE2E/LabelQueryComponent.razor

@@ -26,9 +26,15 @@
 	@((MarkupString) $"""<{htmlElement} id="{htmlElement}-with-aria-label" aria-label="{htmlElement} Aria Label"></{htmlElement}>""")
 }
 
+@* Testing aria-labelledby *@
+@foreach (var htmlElement in htmlElementsThatCanHaveALabel)
+{
+	<h2 id="@htmlElement-with-aria-labelledby">@htmlElement Aria Labelled By</h2>
+	@((MarkupString) $"""<{htmlElement} aria-labelledby="{htmlElement}-with-aria-labelledby"></{htmlElement}>""")
+}
 
 @code {
-	List<string> htmlElementsThatCanHaveALabel = new()
+	readonly List<string> htmlElementsThatCanHaveALabel = new()
 	{
 		"input",
 		"select",

tests/bunit.web.query.tests/Labels/LabelQueryExtensionsTests.cs

@@ -74,6 +74,18 @@ public void Test005(string htmlElementWithLabel)
 		input.Id.ShouldBe($"{htmlElementWithLabel}-with-aria-label");
 	}
 
+	[Theory(DisplayName = "Should return back element associated with another element when that other element uses aria-labelledby")]
+	[MemberData(nameof(HtmlElementsThatCanHaveALabel))]
+	public void Test006(string htmlElementWithLabel)
+	{
+		var cut = RenderComponent<LabelQueryComponent>();
+
+		var input = cut.FindByLabelText($"{htmlElementWithLabel} Aria Labelled By");
+
+		input.ShouldNotBeNull();
+		input.NodeName.ShouldBe(htmlElementWithLabel, StringCompareShould.IgnoreCase);
+		input.GetAttribute("aria-labelledby").ShouldBe($"{htmlElementWithLabel}-with-aria-labelledby");
+	}
+
 	// Throw error that says why
-	// TODO: get aria-labelledby
 }