Added tests for the Amiibo live client and ISO transcoder.

Tests/AmiiboService/Helpers/Extensions/Date+UTC.swift

@@ -0,0 +1,44 @@
+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the Amiibo Service open source project
+//
+// Copyright (c) 2026 Röck+Cöde VoF. and the Amiibo Service project authors
+// Licensed under Apache license v2.0
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of Amiibo Service project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// ===----------------------------------------------------------------------===
+
+import Foundation
+
+extension Date {
+
+    // MARK: Functions
+
+    /// Makes a date from UTC components.
+    static func utc(
+        _ year: Int,
+        _ month: Int,
+        _ day: Int,
+        _ hour: Int = 0,
+        _ minute: Int = 0,
+        _ second: Int = 0
+    ) -> Date {
+        var calendar = Calendar(identifier: .gregorian)
+
+        calendar.timeZone = .init(secondsFromGMT: 0)!
+
+        return calendar.date(from: .init(
+            year: year,
+            month: month,
+            day: day,
+            hour: hour,
+            minute: minute,
+            second: second
+        ))!
+    }
+
+}

Tests/AmiiboService/Helpers/Transports/StubTransport.swift

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+// ===----------------------------------------------------------------------===
+//
+// This source file is part of the Amiibo Service open source project
+//
+// Copyright (c) 2026 Röck+Cöde VoF. and the Amiibo Service project authors
+// Licensed under Apache license v2.0
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of Amiibo Service project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// ===----------------------------------------------------------------------===
+
+import Foundation
+import HTTPTypes
+import OpenAPIRuntime
+
+/// A transport that answers every request with a canned response, for testing purposes.
+struct StubTransport: ClientTransport {
+
+    // MARK: Type aliases
+
+    /// A closure that builds the response for a request.
+    typealias Handler = @Sendable (HTTPRequest) throws -> (HTTPResponse, HTTPBody?)
+
+    // MARK: Properties
+
+    /// The handler that builds the response.
+    private let handler: Handler
+
+    // MARK: Initializers
+
+    /// Initializes this transport with a response handler.
+    init(handler: @escaping Handler) {
+        self.handler = handler
+    }
+
+    /// Initializes this transport with a fixed response.
+    init(status: HTTPResponse.Status, json: String? = nil) {
+        self.init { _ in
+            Self.response(status: status, json: json)
+        }
+    }
+
+    // MARK: Functions
+
+    func send(
+        _ request: HTTPRequest,
+        body: HTTPBody?,
+        baseURL: URL,
+        operationID: String
+    ) async throws -> (HTTPResponse, HTTPBody?) {
+        try handler(request)
+    }
+
+    /// Builds a response with a status and an optional JSON body.
+    static func response(
+        status: HTTPResponse.Status,
+        json: String? = nil
+    ) -> (HTTPResponse, HTTPBody?) {
+        guard let json else {
+            return (.init(status: status), nil)
+        }
+
+        return (
+            .init(status: status, headerFields: [.contentType: "application/json"]),
+            .init(json)
+        )
+    }
+
+}