Map wrapped cancellation in the Amiibo live client to the cancelled error.

Tests/AmiiboService/Cases/Public/Clients/AmiiboLiveClientTests.swift

@@ -42,5 +42,51 @@ struct AmiiboLiveClientTests {
         // THEN
         #expect(url == expected)
     }
-    
+
+    // MARK: Error mapping tests
+
+    @Test(
+        "maps an error thrown by the transport to the matching service error",
+        arguments: zip(
+            TransportErrors.thrown,
+            TransportErrors.expected
+        )
+    )
+    func mapsTransportError(
+        thrown: any Error,
+        expected: AmiiboServiceError
+    ) async {
+        // GIVEN
+        let client = AmiiboLiveClient(transport: ThrowingTransport(error: thrown))
+
+        // WHEN
+        // THEN
+        await #expect(throws: expected) {
+            try await client.getAmiibos(by: .init())
+        }
+    }
+
+}
+
+// MARK: - Arguments
+
+private enum TransportErrors {
+    /// Errors thrown by the transport.
+    static let thrown: [any Error] = [
+        CancellationError(),
+        URLError(.cancelled),
+        URLError(.cannotParseResponse),
+        URLError(.notConnectedToInternet),
+        URLError(.timedOut),
+        URLError(.badURL)
+    ]
+    /// The service error expected for each thrown error.
+    static let expected: [AmiiboServiceError] = [
+        .cancelled,
+        .cancelled,
+        .decoding,
+        .notAvailable,
+        .notAvailable,
+        .unknown(String(describing: URLError(.badURL)))
+    ]
 }

Tests/AmiiboService/Helpers/Transports/ThrowingTransport.swift

@@ -0,0 +1,48 @@
+// ===----------------------------------------------------------------------===
+//
+// 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 throws a given error instead of sending the request, for testing purposes.
+///
+/// The error reaches the live client wrapped in a `ClientError`, as it would from a real transport.
+struct ThrowingTransport: ClientTransport {
+
+    // MARK: Properties
+
+    /// The error to throw.
+    private let error: any Error
+
+    // MARK: Initializers
+
+    /// Initializes this transport.
+    /// - Parameter error: An error to throw.
+    init(error: any Error) {
+        self.error = error
+    }
+
+    // MARK: Functions
+
+    func send(
+        _ request: HTTPRequest,
+        body: HTTPBody?,
+        baseURL: URL,
+        operationID: String
+    ) async throws -> (HTTPResponse, HTTPBody?) {
+        throw error
+    }
+
+}