Add test for API Collection icon rendering in external references

Adds test to verify that articles with task groups from external references get collectionGroup role for correct icon display. The test is temporarily skipped until the fix is implemented in the next commit.

rdar://135837611

Author: RalucaP

Tests/SwiftDocCTests/Rendering/DocumentationContentRendererTests.swift

@@ -131,6 +131,26 @@ class DocumentationContentRendererTests: XCTestCase {
             ]
         )
     }
+    
+    func testRenderKindAndRoleForAPICollection() throws {
+        throw XCTSkip("TDD: Temporarily disabled while implementing API Collection icon fix")
+
+        // Articles with task groups should get collectionGroup role for external references
+        let apiCollectionSummary = LinkDestinationSummary(
+            kind: .article,
+            language: .swift,
+            relativePresentationURL: URL(string: "/documentation/test/external/api-collection")!,
+            referenceURL: URL(string: "doc://com.example.test/documentation/test/external/api-collection")!,
+            title: "External API Collection",
+            availableLanguages: [.swift],
+            taskGroups: [LinkDestinationSummary.TaskGroup(title: "Symbols", identifiers: ["doc://com.example.test/symbol1"])],
+            variants: []
+        )
+
+        let (kind, role) = DocumentationContentRenderer.renderKindAndRole(.article, semantic: nil, linkSummary: apiCollectionSummary)
+        XCTAssertEqual(kind, RenderNode.Kind.article)
+        XCTAssertEqual(role, "collectionGroup")
+    }
 }
 
 private extension DocumentationDataVariantsTrait {