Example of struggling generic controller content.

Author: connor-ricks

Tests/HummingbirdRouterTests/ControllerTests.swift

@@ -42,4 +42,37 @@ final class ControllerTests: XCTestCase {
             }
         }
     }
+
+    func testRouterControllerWithGenericChild() async throws {
+        struct ChildController: RouterController {
+            typealias Context = BasicRouterRequestContext
+            var body: some RouterMiddleware<Context> {
+                Get("child") { _,_ in "child" }
+            }
+        }
+
+        struct ParentController<Child: RouterController>: RouterController where Child.Context: RouterRequestContext {
+            typealias Context = Child.Context
+            @MiddlewareFixedTypeBuilder<Request, Response, Context> var child: () -> Child
+
+            var body: some RouterMiddleware<Context> {
+                RouteGroup("parent") {
+                    child()
+                }
+            }
+        }
+
+        let router = RouterBuilder(context: BasicRouterRequestContext.self) {
+            ParentController {
+                ChildController()
+            }
+        }
+
+        let app = Application(responder: router)
+        try await app.test(.router) { client in
+            try await client.execute(uri: "/parent/child", method: .get) {
+                XCTAssertEqual(String(buffer: $0.body), "child")
+            }
+        }
+    }
 }