Improved and documented the DocCModilleware middleware in the library target.

Test/Sources/Helpers/Mocks/FileProviderMock.swift

@@ -0,0 +1,55 @@
+import Foundation
+import Hummingbird
+
+struct FileProviderMock {
+    
+    // MARK: Properties
+    
+    private var attributes: [String: Data] = [:]
+    private var identifiers: [String] = []
+    
+    // MARK: Functions
+    
+    mutating func setFile(identifier: String) {
+        identifiers += [identifier]
+        attributes[identifier] = identifier.data(using: .utf8)
+    }
+    
+}
+
+// MARK: - FileProvider
+
+extension FileProviderMock: FileProvider {
+    
+    // MARK: Type aliases
+
+    typealias FileAttributes = Data
+    typealias FileIdentifier = String
+    
+    // MARK: Functions
+
+    func getFileIdentifier(_ path: String) -> String? {
+        identifiers.first { $0 == path }
+    }
+    
+    func getAttributes(id: String) async throws -> Data? {
+        attributes[id]
+    }
+    
+    func loadFile(id: String, context: some RequestContext) async throws -> ResponseBody {
+        guard let fileData = attributes[id] else {
+            throw HTTPError(.notFound)
+        }
+
+        return .init(byteBuffer: .init(data: fileData))
+    }
+    
+    func loadFile(
+        id: String,
+        range: ClosedRange<Int>,
+        context: some RequestContext
+    ) async throws -> ResponseBody {
+        try await loadFile(id: id, context: context)
+    }
+    
+}