Added the Input and Output namespaces in the tests target.

Tests/DocCMiddleware/Tests/Internal/Enumerations/AssetFileTests.swift

@@ -71,7 +71,7 @@ private extension AssetFileTests {
 
 // MARK: - Constants
 
-extension Output {
+private extension Output {
     /// A list of expected outputs for the paths of the ``AssetFile`` enumeration cases.
     static let assetFilePaths: [String] = ["/data/documentation.json", "/favicon.ico", "/favicon.svg", "/theme-settings.json"]
 }

Tests/DocCMiddleware/Tests/Internal/Enumerations/AssetFolderTests.swift

@@ -71,7 +71,7 @@ private extension AssetFolderTests {
 
 // MARK: - Constants
 
-extension Output {
+private extension Output {
     /// A list of expected outputs for the paths of the ``AssetFolder`` enumeration cases.
     static let assetFolderPaths: [String] = ["/css/", "/data/", "/downloads/", "/images/", "/img/", "/index/", "/js/", "/videos/"]
 }

Tests/DocCMiddleware/Tests/Internal/Enumerations/DocumentationFolderTests.swift

@@ -71,7 +71,7 @@ private extension DocumentationTypeTests {
 
 // MARK: - Constants
 
-extension Output {
+private extension Output {
     /// A list of expected outputs for the paths of the ``DocumentationFolder`` enumeration cases.
     static let documentationFolderPaths: [String] = ["/documentation", "/tutorials"]
 }

Tests/DocCMiddleware/Tests/Internal/Use Cases/CheckURIUseCaseTests.swift

@@ -79,7 +79,7 @@ private extension CheckURIUseCaseTests {
     
     // MARK: Functions
     
-    /// Asserts a URI type based on a given path and an expected result.
+    /// Asserts a URI path provided by the ``CheckURIPathUseCase`` use case based on a given path and an expected result.
     /// - Parameters:
     ///   - uriPath: A URI path to use with a URI type.
     ///   - result: An expected result coming out of the use case.
@@ -101,14 +101,14 @@ private extension CheckURIUseCaseTests {
 
 // MARK: - Constants
 
-enum Input {
+private extension Input {
     /// A list of non-encoded URI samples.
     static let nonEncodedURIs: [String] = ["/", "/some/known/path", "", "/some/../path", "some/other/path"]
     /// A list of percent-encoded URI samples.
     static let percentEncodedURIs: [String] = ["%2F", "/some%2Fknown%3Fpath", "%20", "/some/%2E%2E/path", "some%2Fother%3Fpath"]
 }
 
-enum Output {
+private extension Output {
     /// A list of expected outputs for the non-encoded URI samples.
     static let nonEncodedURIs: [String?] = ["/", "/some/known/path", "/", nil, nil]
     /// A list of expected outputs for the percent-encoded URI samples.

Tests/DocCMiddleware/Types/Namespaces/Input.swift

@@ -0,0 +1,14 @@
+// ===----------------------------------------------------------------------===
+//
+// 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
+//
+// ===----------------------------------------------------------------------===
+
+/// A namespace assigned for test arguments that would be input into test cases.
+enum Input {}

Tests/DocCMiddleware/Types/Namespaces/Output.swift

@@ -0,0 +1,14 @@
+// ===----------------------------------------------------------------------===
+//
+// 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
+//
+// ===----------------------------------------------------------------------===
+
+/// A namespace assigned for test arguments that would be expected outputs coming from results of test cases.
+enum Output {}