Defined the AssetFile enumeration type in. the library target and also, conformed it to the Pathable protocol.

Sources/DocCMiddleware/Internal/Enumerations/AssetFile.swift

@@ -0,0 +1,38 @@
+// ===----------------------------------------------------------------------===
+//
+// 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
+//
+// ===----------------------------------------------------------------------===
+
+/// An enumeration that represents the essential static files that could be generated by the `DocC` building process.
+enum AssetFile: String, CaseIterable {
+    /// A file defining all the documentation available, which will be used to redirect to the root of the documentation's root article.
+    case documentation = "documentation.json"
+    /// A file containing the icon in `.ico` format within the documentation generated by the `DocC` building process.
+    case faviconICO = "favicon.ico"
+    /// A file containing the icon in `.svg` format within the documentation generated by the `DocC` building process.
+    case faviconSVG = "favicon.svg"
+    /// A file containing the theme settings within the documentation generated by the `DocC` building process.
+    case themeSettings = "theme-settings.json"
+}
+
+// MARK: - Pathable
+
+extension AssetFile: Pathable {
+    
+    // MARK: Computed
+    
+    var path: String {
+        switch self {
+        case .documentation: .init(format: .Format.Path.data, rawValue)
+        default: .init(format: .Format.Path.root, rawValue)
+        }
+    }
+    
+}

Sources/DocCMiddleware/Internal/Protocols/Pathable.swift

@@ -15,7 +15,7 @@ protocol Pathable {
     
     // MARK: Properties
     
-    /// A (relative) path.
+    /// A (relative) path to a resource.
     var path: String { get }
     
 }

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

@@ -0,0 +1,77 @@
+// ===----------------------------------------------------------------------===
+//
+// 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 Testing
+
+@testable import enum DocCMiddleware.AssetFile
+
+@Suite("Asset File", .tags(.enumeration))
+struct AssetFileTests {
+
+    // MARK: Properties tests
+
+#if swift(>=6.2)
+    @Test(arguments: zip(
+        AssetFile.allCases,
+        Output.assetFilePaths
+    ))
+    func `path`(
+        `case`: AssetFile,
+        expects result: String
+    ) {
+        assertPath(`case`, expects: result)
+    }
+#else
+    @Test("path", arguments: zip(
+        AssetFile.allCases,
+        Output.assetFilePaths
+    ))
+    func path(
+        `case`: AssetFile,
+        expects result: String
+    ) {
+        assertPath(`case`, expects: result)
+    }
+#endif
+
+}
+
+// MARK: - Assertions
+
+private extension AssetFileTests {
+    
+    // MARK: Functions
+    
+    /// Asserts the path property based on a given ``AssetFile`` enumeration case and an expected result.
+    /// - Parameters:
+    ///   - case: A representation of the ``AssetFile`` enumeration
+    ///   - result: An expected result coming out of the property.
+    func assertPath(
+        _ case: AssetFile,
+        expects result: String
+    ) {
+        // GIVEN
+        // WHEN
+        let output = `case`.path
+        
+        // THEN
+        #expect(output == result)
+    }
+    
+}
+
+// MARK: - Constants
+
+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/Types/Extensions/Tag+Constants.swift

@@ -16,6 +16,8 @@ extension Tag {
     
     // MARK: Constants
     
+    /// Tag that indicate a test case for an enumeration type.
+    @Tag static var enumeration: Self
     /// Tag that indicate a test case for a type initialization.
     @Tag static var initializer: Self
     /// Tag that indicate a test case for a use case type.