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

Sources/DocCMiddleware/Internal/Enumerations/AssetFolder.swift

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+// ===----------------------------------------------------------------------===
+//
+// 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 all possible asset folders that could be generated by the `DocC` building process.
+enum AssetFolder: String, CaseIterable {
+    /// A folder that contains all CSS style sheets.
+    case css
+    /// A folder that contains all documentation data.
+    case data
+    /// A folder that contains all other resources.
+    case downloads
+    /// A folder that contains all image resources.
+    case images
+    /// A folder that contains all image resources.
+    case img
+    /// A folder that contains all generated `HTML` code.
+    case index
+    /// A folder that contains all generated `Javascript` code.
+    case js
+    /// A folder that contains all video resources.
+    case videos
+}
+
+// MARK: - Pathable
+
+extension AssetFolder: Pathable {
+    
+    // MARK: Computed
+    
+    var path: String {
+        .init(format: .Format.Path.folder, rawValue)
+    }
+    
+}

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

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+// ===----------------------------------------------------------------------===
+//
+// 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.AssetFolder
+
+@Suite("Asset Folder", .tags(.enumeration))
+struct AssetFolderTests {
+    
+    // MARK: Properties tests
+
+#if swift(>=6.2)
+    @Test(arguments: zip(
+        AssetFolder.allCases,
+        Output.assetFolderPaths
+    ))
+    func `path`(
+        `case`: AssetFolder,
+        expects result: String
+    ) {
+        assertPath(`case`, expects: result)
+    }
+#else
+    @Test("path", arguments: zip(
+        AssetFolder.allCases,
+        Output.assetFolderPaths
+    ))
+    func path(
+        `case`: AssetFolder,
+        expects result: String
+    ) {
+        assertPath(`case`, expects: result)
+    }
+#endif
+
+}
+
+// MARK: - Assertions
+
+private extension AssetFolderTests {
+    
+    // MARK: Functions
+    
+    /// Asserts the path property based on a given ``AssetFolder`` enumeration case and an expected result.
+    /// - Parameters:
+    ///   - case: A representation of the ``AssetFolder`` enumeration
+    ///   - result: An expected result coming out of the property.
+    func assertPath(
+        _ case: AssetFolder,
+        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 ``AssetFolder`` enumeration cases.
+    static let assetFolderPaths: [String] = ["/css/", "/data/", "/downloads/", "/images/", "/img/", "/index/", "/js/", "/videos/"]
+}