Implemented the "metadata()" helper function for the LoggerMetadata+Helpers extension in the library target.

Tests/DocCMiddleware/Types/Extensions/Logger+Constants.swift

@@ -10,6 +10,7 @@
 //
 // ===----------------------------------------------------------------------===
 
+import Foundation
 import Logging
 import Testing
 
@@ -22,7 +23,9 @@ extension Logger {
         var logger = Logger(label: "test.hummingbird-docc-middleware.logger")
         
         logger.logLevel = try! #require(Logger.Level.allCases.randomElement())
-        
+
+        logger[metadataKey: "hb.request.id"] = "\(UUID().uuidString)"
+
         return logger
     }()
     

Tests/DocCMiddleware/Types/Extensions/Request+Helpers.swift

@@ -0,0 +1,41 @@
+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the Hummingbird DocC Middleware open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the Hummingbird DocC Middleware project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of Hummingbird DocC Middleware project authors
+//
+// ===----------------------------------------------------------------------===
+
+import struct Hummingbird.HTTPRequest
+import struct Hummingbird.Request
+import struct Hummingbird.RequestBody
+
+extension Request {
+    
+    // MARK: Functions
+    
+    /// Generates a request that is ready to use in test case.
+    /// - Parameters:
+    ///   - method: A HTTP method.
+    ///   - path: A URI path, if any.
+    /// - Returns: A generated request instance to use in test cases.
+    static func test(
+        method: HTTPRequest.Method,
+        path: String? = nil
+    ) -> Self {
+        .init(
+            head: .init(
+                method: method,
+                scheme: nil,
+                authority: nil,
+                path: path
+            ),
+            body: .init(buffer: .init())
+        )
+    }
+    
+}

Tests/DocCMiddleware/Types/Extensions/Tag+Constants.swift

@@ -18,6 +18,8 @@ extension Tag {
     
     /// Tag that indicate a test case for an enumeration type.
     @Tag static var enumeration: Self
+    /// Tag that indicate a test case for an extended type.
+    @Tag static var `extension`: Self
     /// Tag that indicate a test case for a middleware type.
     @Tag static var middleware: Self
     /// Tag that indicate a test case for a use case type.

Tests/DocCMiddleware/Types/Mocks/MockRequestContext.swift

@@ -0,0 +1,51 @@
+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the Hummingbird DocC Middleware open source project
+//
+// Copyright (c) 2025 Röck+Cöde VoF. and the Hummingbird DocC Middleware project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of Hummingbird DocC Middleware project authors
+//
+// ===----------------------------------------------------------------------===
+
+import class NIOEmbedded.NIOAsyncTestingChannel
+
+import protocol Hummingbird.RequestContext
+
+import struct Hummingbird.ApplicationRequestContextSource
+import struct Hummingbird.CoreRequestContextStorage
+import struct Logging.Logger
+
+/// A mock that conforms to the `RequestContext` protocol.
+struct MockRequestContext {
+
+    // MARK: Properties
+    
+    var coreContext: CoreRequestContextStorage
+    
+    // MARK: Initializers
+    
+    /// Initializes this mock.
+    /// - Parameter logger: A type that interacts with the logging system.
+    init(logger: Logger) {
+        self.coreContext = .init(source: ApplicationRequestContextSource(
+            channel: NIOAsyncTestingChannel(),
+            logger: logger
+        ))
+    }
+    
+}
+
+// MARK: - RequestContext
+
+extension MockRequestContext: RequestContext {
+    
+    // MARK: Initializers
+    
+    init(source: ApplicationRequestContextSource) {
+        self.coreContext = .init(source: source)
+    }
+    
+}

Tests/DocCMiddleware/Types/Namespaces/Input.swift

@@ -10,5 +10,5 @@
 //
 // ===----------------------------------------------------------------------===
 
-/// A namespace assigned for test arguments that would be input into test cases.
+/// A namespace assigned for test arguments 
 enum Input {}