Improvements on the AmiiboService service type initialization (#12)

This PR addresses the issue #10 as described in the *Possible Solution* section in that issue.

Reviewed-on: #12
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Tests/AmiiboService/Types/Clients/AmiiboMockClient.swift

@@ -0,0 +1,217 @@
+//===----------------------------------------------------------------------===
+//
+// This source file is part of the AmiiboService open source project
+//
+// Copyright (c) 2024-2025 Röck+Cöde VoF. and the AmiiboAPI project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of AmiiboAPI project authors
+//
+//===----------------------------------------------------------------------===
+
+import AmiiboService
+import Foundation
+
+/// A type that implements a mock client, for testing purposes.
+struct AmiiboMockClient {
+    
+    // MARK: Properties
+    
+    /// A list of amiibo items to return, if any.
+    private let amiibos: [Amiibo]?
+    
+    /// A list of amiibo series to return, if any.
+    private let amiiboSeries: [AmiiboSeries]?
+    
+    /// A list of amiibo types to return, if any.
+    private let amiiboTypes: [AmiiboType]?
+    
+    /// An error to throw, if any.
+    private let error: AmiiboServiceError?
+    
+    /// A list of game characters to return, if any.
+    private let gameCharacters: [GameCharacter]?
+    
+    /// A list of game series to return, if any.
+    private let gameSeries: [GameSeries]?
+    
+    /// A last updated date to return, if any.
+    private let lastUpdated: Date?
+    
+    // MARK: Initializers
+    
+    /// Initializes this client.
+    /// - Parameters:
+    ///   - amiibos: A list of amiibo items to return, if any.
+    ///   - amiiboSeries: A list of amiibo series to return, if any.
+    ///   - amiiboTypes: A list of amiibo types to return, if any.
+    ///   - gameCharacters: A list of game characters to return, if any.
+    ///   - gameSeries: A list of game series to return, if any.
+    ///   - lastUpdated: A last updated date to return, if any.
+    ///   - error: An error to throw, if any. 
+    init(
+        amiibos: [Amiibo]? = nil,
+        amiiboSeries: [AmiiboSeries]? = nil,
+        amiiboTypes: [AmiiboType]? = nil,
+        gameCharacters: [GameCharacter]? = nil,
+        gameSeries: [GameSeries]? = nil,
+        lastUpdated: Date? = nil,
+        error: AmiiboServiceError? = nil
+    ) {
+        self.amiibos = amiibos
+        self.amiiboSeries = amiiboSeries
+        self.amiiboTypes = amiiboTypes
+        self.error = error
+        self.gameCharacters = gameCharacters
+        self.gameSeries = gameSeries
+        self.lastUpdated = lastUpdated
+    }
+    
+}
+
+// MARK: - AmiiboClient
+
+extension AmiiboMockClient: AmiiboClient {
+    
+    // MARK: Functions
+
+#if swift(>=6.0)
+    func getAmiibos(by filter: AmiiboFilter) async throws(AmiiboServiceError) -> [Amiibo] {
+        try throwErrorIfExists()
+
+        guard let amiibos else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return amiibos
+    }
+
+    func getAmiiboSeries(by filter: AmiiboSeriesFilter) async throws(AmiiboServiceError) -> [AmiiboSeries] {
+        try throwErrorIfExists()
+
+        guard let amiiboSeries else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return amiiboSeries
+    }
+
+    func getAmiiboTypes(by filter: AmiiboTypeFilter) async throws(AmiiboServiceError) -> [AmiiboType] {
+        try throwErrorIfExists()
+
+        guard let amiiboTypes else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return amiiboTypes
+    }
+
+    func getGameCharacters(by filter: GameCharacterFilter) async throws(AmiiboServiceError) -> [GameCharacter] {
+        try throwErrorIfExists()
+
+        guard let gameCharacters else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return gameCharacters
+    }
+
+    func getGameSeries(by filter: GameSeriesFilter) async throws(AmiiboServiceError) -> [GameSeries] {
+        try throwErrorIfExists()
+
+        guard let gameSeries else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return gameSeries
+    }
+
+    func getLastUpdated() async throws(AmiiboServiceError) -> Date {
+        try throwErrorIfExists()
+
+        guard let lastUpdated else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return lastUpdated
+    }
+#else
+    func getAmiibos(by filter: AmiiboFilter) async throws -> [Amiibo] {
+        try throwErrorIfExists()
+        
+        guard let amiibos else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return amiibos
+    }
+    
+    func getAmiiboSeries(by filter: AmiiboSeriesFilter) async throws -> [AmiiboSeries] {
+        try throwErrorIfExists()
+        
+        guard let amiiboSeries else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return amiiboSeries
+    }
+    
+    func getAmiiboTypes(by filter: AmiiboTypeFilter) async throws -> [AmiiboType] {
+        try throwErrorIfExists()
+        
+        guard let amiiboTypes else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return amiiboTypes
+    }
+    
+    func getGameCharacters(by filter: GameCharacterFilter) async throws -> [GameCharacter] {
+        try throwErrorIfExists()
+        
+        guard let gameCharacters else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return gameCharacters
+    }
+    
+    func getGameSeries(by filter: GameSeriesFilter) async throws -> [GameSeries] {
+        try throwErrorIfExists()
+        
+        guard let gameSeries else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return gameSeries
+    }
+
+    func getLastUpdated() async throws -> Date {
+        try throwErrorIfExists()
+        
+        guard let lastUpdated else {
+            throw AmiiboServiceError.notFound
+        }
+        
+        return lastUpdated
+    }
+#endif
+    
+}
+
+// MARK: - Helpers
+
+private extension AmiiboMockClient {
+    
+    // MARK: Functions
+    
+    /// Throws an error if it has been provided,
+    /// - Throws: An ``AmiiboServiceError`` error in case an error has been provided.
+    func throwErrorIfExists() throws(AmiiboServiceError) {
+        if let error {
+            throw error
+        }
+    }
+    
+}

Tests/AmiiboService/Types/Extensions/Tag+Customs.swift

@@ -0,0 +1,22 @@
+//===----------------------------------------------------------------------===
+//
+// This source file is part of the AmiiboService open source project
+//
+// Copyright (c) 2024-2025 Röck+Cöde VoF. and the AmiiboAPI project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE for license information
+// See CONTRIBUTORS for the list of AmiiboAPI project authors
+//
+//===----------------------------------------------------------------------===
+
+import Testing
+
+extension Tag {
+    
+    // MARK: Properties
+    
+    /// Tag that indicates tests against a live backend service.
+    @Tag static var live: Self
+    
+}