README.md

@@ -56,7 +56,7 @@ let gameSeries = try await service.getGameSeries()
 let lastUpdated = try await service.getLastUpdated()
 ```
 
-Results are sorted in ascending order by identifier (amiibos) or key (everything else).
+Results are sorted in ascending order by identifier (amiibos) or key (everything else). Models are `Hashable`, `Codable`, and `Identifiable`; filters are `Hashable`.
 
 ## Error handling
 

Sources/AmiiboService/Catalogs/AmiiboService.docc/Library.md

@@ -6,7 +6,7 @@ A Swift client for the Amiibo API.
 
 `AmiiboService` fetches data from the [Amiibo API](https://www.amiiboapi.org) and returns it as Swift models.
 
-The library does not expose a generated client that maps one-to-one to the REST endpoints. Instead, ``AmiiboService`` offers one method per resource, takes a typed filter, returns sorted models, and throws a single ``AmiiboServiceError`` type.
+``AmiiboService`` offers one method per resource: each takes a typed filter, returns sorted models, and throws ``AmiiboServiceError``.
 
 ## Installation
 
@@ -76,9 +76,7 @@ do throws(AmiiboServiceError) {
 
 ## Caching
 
-The library has no built-in cache. The Amiibo API asks regular consumers to cache responses.
+The library has no built-in cache, and the Amiibo API asks regular consumers to cache responses. To cache at the HTTP level, give ``AmiiboLiveClient`` a transport backed by a `URLCache`:
-
-To cache at the HTTP level, give ``AmiiboLiveClient`` a transport backed by a `URLCache`. The cache follows the server's cache headers:
 
 ```swift
 import OpenAPIURLSession
@@ -101,11 +99,11 @@ let service = AmiiboService(
 )
 ```
 
-You can also store the returned models in your own application storage.
+Models are `Codable`, so you can also store them yourself.
 
 ## Testing
 
-To test without network access, pass a mock ``AmiiboClient`` to ``AmiiboService/init(client:)``. The mock can return stub data or throw ``AmiiboServiceError`` values. ``AmiiboClient`` refines `Sendable`, so the mock must be `Sendable`, too:
+To test without network access, pass a mock ``AmiiboClient`` to ``AmiiboService/init(client:)``. ``AmiiboClient`` refines `Sendable`, so the mock must be `Sendable`, too:
 
 ```swift
 import AmiiboService

Sources/AmiiboService/Internal/Extensions/DateFormatter+Properties.swift

@@ -18,13 +18,11 @@ extension DateFormatter {
     
     // MARK: Properties
     
-    /// An ISO date formatter.
+    /// An ISO date formatter for the `yyyy-MM-dd` format.
-    ///
-    /// This formatter implements the `yyyy-MM-dd` date format.
     static let isoDate: DateFormatter = {
         let formatter = DateFormatter()
         
-        // A fixed-format date requires the POSIX locale, as the user's locale or 12/24-hour setting could otherwise alter the parsing.
+        // The POSIX locale keeps the user's locale and 12/24-hour setting from altering fixed-format parsing.
         formatter.locale = .init(identifier: "en_US_POSIX")
         formatter.dateFormat = "yyyy-MM-dd"
         formatter.timeZone = .init(secondsFromGMT: 0)
@@ -32,14 +30,13 @@ extension DateFormatter {
         return formatter
     }()
     
-    /// An ISO timestamp formatter.
+    /// An ISO timestamp formatter for the `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` format.
     ///
-    /// This formatter implements the `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` custom date format.
+    /// Used only to decode the timestamp returned by ``AmiiboService/getLastUpdated()``.
-    /// Within the context of this library, this formatter is solely used to decode a date formatted as a timestamp that is returned by the ``AmiiboService/getLastUpdated()`` function.
     static let isoTimestamp: DateFormatter = {
         let formatter = DateFormatter()
         
-        // A fixed-format date requires the POSIX locale, as the user's locale or 12/24-hour setting could otherwise alter the parsing.
+        // The POSIX locale keeps the user's locale and 12/24-hour setting from altering fixed-format parsing.
         formatter.locale = .init(identifier: "en_US_POSIX")
         formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSS"
         formatter.timeZone = .init(secondsFromGMT: 0)

Sources/AmiiboService/Internal/Protocols/KeyNameFilter.swift

@@ -12,8 +12,8 @@
 // 
 // ===----------------------------------------------------------------------===
 
-/// A protocol that defines filters containing optional `key` and/or `name` values for querying resources.
+/// A protocol for filters with optional `key` and `name` values.
-protocol KeyNameFilter {
+protocol KeyNameFilter: Hashable {
     
     // MARK: Properties
     

Sources/AmiiboService/Internal/Protocols/KeyNameModel.swift

@@ -13,7 +13,7 @@
 // ===----------------------------------------------------------------------===
 
 /// A protocol that defines models containing a `key` and `name` pair.
-protocol KeyNameModel: Sendable, Hashable {
+protocol KeyNameModel: Sendable, Hashable, Codable, Identifiable {
     
     // MARK: Properties
     

Sources/AmiiboService/Internal/Transcoders/ISODateTimeTranscoder.swift

@@ -15,15 +15,15 @@
 import Foundation
 import OpenAPIRuntime
 
-/// A type that allows the decoding and encoding of ISO dates, supporting both the `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` timestamp format and the `yyyy-MM-dd` date-only format.
+/// A transcoder for ISO dates in the `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` timestamp and `yyyy-MM-dd` date-only formats.
 struct ISODateTimeTranscoder {
     
     // MARK: Properties
     
-    /// A formatter to use to decode and encode ISO timestamp dates.
+    /// The ISO timestamp formatter.
     private let timestampFormatter: DateFormatter = .isoTimestamp
-    
+
-    /// A formatter to use to decode and encode ISO date-only strings.
+    /// The ISO date-only formatter.
     private let dateFormatter: DateFormatter = .isoDate
     
 }
@@ -34,17 +34,13 @@ extension ISODateTimeTranscoder: DateTranscoder {
     
     // MARK: Functions
     
-    /// Encodes a date into an ISO timestamp string.
+    /// Encodes a date as an ISO timestamp string.
-    /// - Parameter date: A date to encode.
-    /// - Returns: A string representation of the date in `yyyy-MM-dd'T'HH:mm:ss.SSSSSS` format.
     func encode(_ date: Date) throws -> String {
         timestampFormatter.string(from: date)
     }
     
-    /// Decodes an ISO date string into a date, trying the timestamp format first and falling back to the date-only format.
+    /// Decodes an ISO date string, trying the timestamp format before the date-only one.
-    /// - Parameter string: A string to decode.
+    /// - Throws: A `DecodingError` if the string matches neither format.
-    /// - Returns: A date parsed from the string.
-    /// - Throws: A `DecodingError` if the string cannot be parsed into a valid date.
     func decode(_ string: String) throws -> Date {
         if let date = timestampFormatter.date(from: string) {
             return date

Sources/AmiiboService/Public/Clients/AmiiboLiveClient.swift

@@ -16,16 +16,16 @@ import Foundation
 import OpenAPIRuntime
 import OpenAPIURLSession
 
-/// A type that implements a live client to the [Amiibo API](https://www.amiiboapi.org) online service.
+/// A live client for the [Amiibo API](https://www.amiiboapi.org).
 ///
-/// This client maps any transport error or unsuccessful HTTP response to an ``AmiiboServiceError`` error, and sorts the items of the list responses in ascending order by identifier or key.
+/// It maps transport errors and unsuccessful responses to ``AmiiboServiceError``, and sorts list results by identifier or key.
 public struct AmiiboLiveClient: Sendable {
     
     // MARK: Constants
     
-    /// The base URL of the live service, resolved once from the server defined in the OpenAPI specification.
+    /// The base URL of the live service, from the OpenAPI specification.
     ///
-    /// The validity of the URL is guaranteed by the bundled `openapi.yaml` specification and enforced by a unit test, so resolution is not expected to fail at runtime.
+    /// A unit test guards this URL, so resolution is not expected to fail at runtime.
     static let serverURL: URL = {
         guard let url = try? Servers.Server1.url() else {
             fatalError("The server URL defined in the OpenAPI specification could not be resolved. Verify that the 'openapi.yaml' server definition is valid.")
@@ -41,8 +41,8 @@ public struct AmiiboLiveClient: Sendable {
     
     // MARK: Initializers
     
-    /// Initializes this client with a transport for performing HTTP operations.
+    /// Initializes this client.
-    /// - Parameter transport: A transport that performs HTTP operations. Defaults to a `URLSessionTransport` using the shared session.
+    /// - Parameter transport: A transport for HTTP operations. Defaults to a `URLSessionTransport` on the shared session.
     public init(transport: any ClientTransport = URLSessionTransport()) {
         self.client = .init(
             serverURL: Self.serverURL,
@@ -61,9 +61,9 @@ extension AmiiboLiveClient: AmiiboClient {
     // MARK: Functions
     
     /// Gets a list of amiibo items based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo items.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiibos(
         by filter: AmiiboFilter
     ) async throws(AmiiboServiceError) -> [Amiibo] {
@@ -71,9 +71,9 @@ extension AmiiboLiveClient: AmiiboClient {
     }
 
     /// Gets a list of amiibo series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiiboSeries(
         by filter: AmiiboSeriesFilter
     ) async throws(AmiiboServiceError) -> [AmiiboSeries] {
@@ -81,9 +81,9 @@ extension AmiiboLiveClient: AmiiboClient {
     }
  
     /// Gets a list of amiibo types based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo types.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiiboTypes(
         by filter: AmiiboTypeFilter
     ) async throws(AmiiboServiceError) -> [AmiiboType] {
@@ -91,9 +91,9 @@ extension AmiiboLiveClient: AmiiboClient {
     }
 
     /// Gets a list of game characters based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game characters.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getGameCharacters(
         by filter: GameCharacterFilter
     ) async throws(AmiiboServiceError) -> [GameCharacter] {
@@ -101,9 +101,9 @@ extension AmiiboLiveClient: AmiiboClient {
     }
 
     /// Gets a list of game series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getGameSeries(
         by filter: GameSeriesFilter
     ) async throws(AmiiboServiceError) -> [GameSeries] {
@@ -112,7 +112,7 @@ extension AmiiboLiveClient: AmiiboClient {
 
     /// Gets the date when the data was last updated.
     /// - Returns: A last updated date, decoded as UTC.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getLastUpdated() async throws(AmiiboServiceError) -> Date {
         try await fetchLastUpdated()
     }
@@ -125,10 +125,7 @@ private extension AmiiboLiveClient {
     
     // MARK: Functions
     
-    /// Fetches a list of amiibo items based on a given filter.
+    /// Fetches the amiibos matching a filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
-    /// - Returns: A list of fetched amiibo items filtered, if requested.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
     func fetchAmiibos(
         _ filter: AmiiboFilter
     ) async throws(AmiiboServiceError) -> [Amiibo] {
@@ -174,10 +171,7 @@ private extension AmiiboLiveClient {
         }
     }
 
-    /// Fetches a list of amiibo series based on a given filter.
+    /// Fetches the amiibo series matching a filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
-    /// - Returns: A list of fetched amiibo series filtered, if requested.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
     func fetchAmiiboSeries(
         _ filter: AmiiboSeriesFilter
     ) async throws(AmiiboServiceError) -> [AmiiboSeries] {
@@ -210,10 +204,7 @@ private extension AmiiboLiveClient {
         }
     }
     
-    /// Fetches a list of amiibo types based on a given filter.
+    /// Fetches the amiibo types matching a filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
-    /// - Returns: A list of fetched amiibo types filtered, if requested.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
     func fetchAmiiboTypes(
         _ filter: AmiiboTypeFilter
     ) async throws(AmiiboServiceError) -> [AmiiboType] {
@@ -246,10 +237,7 @@ private extension AmiiboLiveClient {
         }
     }
     
-    /// Fetches a list of game characters based on a given filter.
+    /// Fetches the game characters matching a filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
-    /// - Returns: A list of fetched game characters filtered, if requested.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
     func fetchGameCharacters(
         _ filter: GameCharacterFilter
     ) async throws(AmiiboServiceError) -> [GameCharacter] {
@@ -282,10 +270,7 @@ private extension AmiiboLiveClient {
         }
     }
     
-    /// Fetches a list of game series based on a given filter.
+    /// Fetches the game series matching a filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
-    /// - Returns: A list of fetched game series filtered, if requested.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
     func fetchGameSeries(
         _ filter: GameSeriesFilter
     ) async throws(AmiiboServiceError) -> [GameSeries] {
@@ -319,8 +304,6 @@ private extension AmiiboLiveClient {
     }
     
     /// Fetches the date when the data was last updated.
-    /// - Returns: A fetched last updated date, decoded as UTC.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
     func fetchLastUpdated() async throws(AmiiboServiceError) -> Date {
         let response = try await perform {
             try await client.getLastUpdated()
@@ -339,10 +322,7 @@ private extension AmiiboLiveClient {
         }
     }
     
-    /// Performs an API call, mapping any error thrown by the underlying client to an ``AmiiboServiceError`` error.
+    /// Performs an API call, mapping any error to an ``AmiiboServiceError``.
-    /// - Parameter operation: A closure that performs the API call.
-    /// - Returns: The output of the performed API call.
-    /// - Throws: An ``AmiiboServiceError`` error in case the API call failed.
     func perform<Output>(
         _ operation: () async throws -> Output
     ) async throws(AmiiboServiceError) -> Output {
@@ -353,18 +333,14 @@ private extension AmiiboLiveClient {
         }
     }
     
-    /// Maps a list of key-name payloads into a sorted list of models.
+    /// Maps key-name payloads into models sorted by key.
-    /// - Parameter payloads: A list of payloads to map into models.
-    /// - Returns: A list of models sorted by their keys in ascending order.
     func makeModels<Model: KeyNameModel>(from payloads: [some KeyNamePayload]) -> [Model] {
         payloads
             .map { Model($0) }
             .sorted { $0.key < $1.key }
     }
     
-    /// Maps a given error to an ``AmiiboServiceError`` error.
+    /// Maps an error to the corresponding ``AmiiboServiceError``.
-    /// - Parameter error: An error to map.
-    /// - Throws: An ``AmiiboServiceError`` error that corresponds to the given error.
     func handle(error: any Error) throws(AmiiboServiceError) -> Never {
         switch error {
         case is CancellationError:

Sources/AmiiboService/Public/Errors/AmiiboServiceError.swift

@@ -22,7 +22,7 @@ public enum AmiiboServiceError: Error {
     case cancelled
     /// The response body could not be decoded into the expected model.
     case decoding
-    /// The backend service is currently unreachable due to a network or server issue.
+    /// The service is unreachable due to a network or server issue.
     case notAvailable
     /// No results were found matching the given filter criteria.
     ///
@@ -30,7 +30,7 @@ public enum AmiiboServiceError: Error {
     case notFound
     /// The server returned an undocumented HTTP status code.
     case undocumented(_ statusCode: Int)
-    /// An unexpected error that does not fall into any other category, with a description of the underlying error.
+    /// Any other error, with a description of the underlying one.
     case unknown(_ description: String)
 }
 

Sources/AmiiboService/Public/Filters/AmiiboFilter.swift

@@ -15,7 +15,7 @@
 /// A filter for amiibo requests.
 ///
 /// Values left as `nil` do not restrict the result.
-public struct AmiiboFilter: Sendable {
+public struct AmiiboFilter: Sendable, Hashable {
 
     // MARK: Properties
 
@@ -37,10 +37,10 @@ public struct AmiiboFilter: Sendable {
     /// An amiibo series key or name to match, if any.
     public let series: String?
 
-    /// A flag that indicates whether to include related games in ``Amiibo/platform``. `nil` means `false`.
+    /// Whether to include related games in ``Amiibo/platform``. `nil` means `false`.
     public let showGames: Bool?
 
-    /// A flag that indicates whether to include related games and their amiibo usages in ``Amiibo/platform``. `nil` means `false`.
+    /// Whether to include related games and their usages in ``Amiibo/platform``. `nil` means `false`.
     public let showUsage: Bool?
 
     /// The last 8 hexadecimal characters of an identifier to match, if any. Shorter values match as a prefix.
@@ -61,8 +61,8 @@ public struct AmiiboFilter: Sendable {
     ///   - series: An amiibo series key or name to match, if any.
     ///   - gameCharacter: A game character key or name to match, if any.
     ///   - gameSeries: A game series key or name to match, if any.
-    ///   - showGames: A flag that indicates whether to include related games in ``Amiibo/platform``. `nil` means `false`.
+    ///   - showGames: Whether to include related games in ``Amiibo/platform``. `nil` means `false`.
-    ///   - showUsage: A flag that indicates whether to include related games and their amiibo usages in ``Amiibo/platform``. `nil` means `false`.
+    ///   - showUsage: Whether to include related games and their usages in ``Amiibo/platform``. `nil` means `false`.
     public init(
         head: String? = nil,
         tail: String? = nil,

Sources/AmiiboService/Public/Models/Amiibo.swift

@@ -15,7 +15,7 @@
 import Foundation
 
 /// A model that represents an amiibo.
-public struct Amiibo: Sendable, Hashable {
+public struct Amiibo: Sendable, Hashable, Codable, Identifiable {
     
     // MARK: Properties
     
@@ -36,7 +36,7 @@ public struct Amiibo: Sendable, Hashable {
 
     /// The related games of this amiibo, grouped by platform.
     ///
-    /// This value is `nil` unless the request sets ``AmiiboFilter/showGames`` or ``AmiiboFilter/showUsage``, or when the amiibo has no related games.
+    /// `nil` unless the request sets ``AmiiboFilter/showGames`` or ``AmiiboFilter/showUsage``, or when there are no related games.
     public let platform: Platform?
     
     /// The release dates of this amiibo across different regions.
@@ -99,7 +99,12 @@ public struct Amiibo: Sendable, Hashable {
     }
     
     // MARK: Computed
-    
+
+    /// The ``identifier`` of this amiibo.
+    public var id: String {
+        identifier
+    }
+
     /// The full 16-character hexadecimal identifier, composed of the ``head`` and ``tail``.
     public var identifier: String {
         head + tail

Sources/AmiiboService/Public/Models/Amiibo/Amiibo+Game.swift

@@ -14,7 +14,7 @@
 
 extension Amiibo {
     /// A model that represents a game related to an amiibo.
-    public struct Game: Sendable, Hashable {
+    public struct Game: Sendable, Hashable, Codable {
         
         // MARK: Properties
         

Sources/AmiiboService/Public/Models/Amiibo/Amiibo+Platform.swift

@@ -13,8 +13,8 @@
 // ===----------------------------------------------------------------------===
 
 extension Amiibo {
-    /// A model that represents a collection of `Switch`, `Switch 2`, `3DS`, and `Wii U` games related to an amiibo.
+    /// A model that groups the games related to an amiibo by platform.
-    public struct Platform: Sendable, Hashable {
+    public struct Platform: Sendable, Hashable, Codable {
         
         // MARK: Properties
         

Sources/AmiiboService/Public/Models/Amiibo/Amiibo+Release.swift

@@ -18,7 +18,7 @@ extension Amiibo {
     /// A model that represents the regional release dates of an amiibo.
     ///
     /// The service provides these dates as date-only values, which are decoded as midnight UTC.
-    public struct Release: Sendable, Hashable {
+    public struct Release: Sendable, Hashable, Codable {
         
         // MARK: Properties
         

Sources/AmiiboService/Public/Models/Amiibo/Amiibo+Usage.swift

@@ -14,14 +14,14 @@
 
 extension Amiibo {
     /// A model that represents the usage of an amiibo within a certain game.
-    public struct Usage: Sendable, Hashable {
+    public struct Usage: Sendable, Hashable, Codable {
         
         // MARK: Properties
         
         /// A description of how the amiibo is used within the game.
         public let explanation: String
         
-        /// A flag that indicates whether the amiibo can save game data.
+        /// Whether the amiibo can save game data.
         public let isWriteable: Bool
         
         // MARK: Initializers

Sources/AmiiboService/Public/Models/AmiiboSeries.swift

@@ -37,5 +37,12 @@ public struct AmiiboSeries: KeyNameModel {
         self.key = payload.key
         self.name = payload.name
     }
-    
+
+    // MARK: Computed
+
+    /// The ``key`` of this amiibo series.
+    public var id: String {
+        key
+    }
+
 }

Sources/AmiiboService/Public/Models/AmiiboType.swift

@@ -37,5 +37,12 @@ public struct AmiiboType: KeyNameModel {
         self.key = payload.key
         self.name = payload.name
     }
-    
+
+    // MARK: Computed
+
+    /// The ``key`` of this amiibo type.
+    public var id: String {
+        key
+    }
+
 }

Sources/AmiiboService/Public/Models/GameCharacter.swift

@@ -37,5 +37,12 @@ public struct GameCharacter: KeyNameModel {
         self.key = payload.key
         self.name = payload.name
     }
-    
+
+    // MARK: Computed
+
+    /// The ``key`` of this game character.
+    public var id: String {
+        key
+    }
+
 }

Sources/AmiiboService/Public/Models/GameSeries.swift

@@ -37,5 +37,12 @@ public struct GameSeries: KeyNameModel {
         self.key = payload.key
         self.name = payload.name
     }
-    
+
+    // MARK: Computed
+
+    /// The ``key`` of this game series.
+    public var id: String {
+        key
+    }
+
 }

Sources/AmiiboService/Public/Protocols/AmiiboClient.swift

@@ -16,44 +16,44 @@ import Foundation
 
 /// A protocol that defines a client that fetches data from the Amiibo API.
 ///
-/// ``AmiiboLiveClient`` is the default implementation. Conform to this protocol to provide another one, such as a mock for tests. Conforming types must be `Sendable`.
+/// ``AmiiboLiveClient`` is the default implementation; conform to provide another, such as a mock. Conforming types must be `Sendable`.
 public protocol AmiiboClient: Sendable {
     
     // MARK: Functions
     
     /// Gets a list of amiibo items based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo items.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     func getAmiibos(by filter: AmiiboFilter) async throws(AmiiboServiceError) -> [Amiibo]
     
     /// Gets a list of amiibo series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     func getAmiiboSeries(by filter: AmiiboSeriesFilter) async throws(AmiiboServiceError) -> [AmiiboSeries]
     
     /// Gets a list of amiibo types based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo types.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     func getAmiiboTypes(by filter: AmiiboTypeFilter) async throws(AmiiboServiceError) -> [AmiiboType]
     
     /// Gets a list of game characters based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game characters.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     func getGameCharacters(by filter: GameCharacterFilter) async throws(AmiiboServiceError) -> [GameCharacter]
     
     /// Gets a list of game series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     func getGameSeries(by filter: GameSeriesFilter) async throws(AmiiboServiceError) -> [GameSeries]
     
     /// Gets the date when the data was last updated.
     /// - Returns: A last updated date, decoded as UTC.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     func getLastUpdated() async throws(AmiiboServiceError) -> Date
 
 }

Sources/AmiiboService/Public/Services/AmiiboService.swift

@@ -16,7 +16,7 @@ import Foundation
 
 /// The entry point for fetching data from the Amiibo API.
 ///
-/// This service forwards every call to the ``AmiiboClient`` passed at initialization, which defaults to ``AmiiboLiveClient``. It is `Sendable`, so you can share an instance across concurrency domains.
+/// It forwards every call to the ``AmiiboClient`` given at initialization, which defaults to ``AmiiboLiveClient``. Instances are `Sendable`.
 public struct AmiiboService: Sendable {
 
     // MARK: Properties
@@ -35,9 +35,9 @@ public struct AmiiboService: Sendable {
     // MARK: Functions
     
     /// Gets a list of amiibo items based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo items.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiibos(
         _ filter: AmiiboFilter = .init()
     ) async throws(AmiiboServiceError) -> [Amiibo] {
@@ -45,9 +45,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of amiibo series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiiboSeries(
         _ filter: AmiiboSeriesFilter = .init()
     ) async throws(AmiiboServiceError) -> [AmiiboSeries] {
@@ -55,9 +55,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of amiibo types based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered amiibo types.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getAmiiboTypes(
         _ filter: AmiiboTypeFilter = .init()
     ) async throws(AmiiboServiceError) -> [AmiiboType] {
@@ -65,9 +65,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of game characters based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game characters.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getGameCharacters(
         _ filter: GameCharacterFilter = .init()
     ) async throws(AmiiboServiceError) -> [GameCharacter] {
@@ -75,9 +75,9 @@ public struct AmiiboService: Sendable {
     }
 
     /// Gets a list of game series based on a given filter.
-    /// - Parameter filter: A filter to remove unwanted items from the result.
+    /// - Parameter filter: A filter for the result.
     /// - Returns: A list of filtered game series.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getGameSeries(
         _ filter: GameSeriesFilter = .init()
     ) async throws(AmiiboServiceError) -> [GameSeries] {
@@ -86,7 +86,7 @@ public struct AmiiboService: Sendable {
 
     /// Gets the date when the data was last updated.
     /// - Returns: A last updated date, decoded as UTC.
-    /// - Throws: An ``AmiiboServiceError`` error in case some issue is encountered while generating the result.
+    /// - Throws: An ``AmiiboServiceError`` if the call fails.
     public func getLastUpdated() async throws(AmiiboServiceError) -> Date {
         try await client.getLastUpdated()
     }

Tests/AmiiboService/Cases/Public/Filters/FilterConformanceTests.swift

@@ -0,0 +1,61 @@
+// ===----------------------------------------------------------------------===
+//
+// 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 AmiiboService
+import Testing
+
+@Suite("Filter conformances")
+struct FilterConformanceTests {
+
+    // MARK: Equatable tests
+
+    @Test("compares amiibo filters by value")
+    func amiiboFilterEquality() {
+        // GIVEN
+        // WHEN
+        // THEN
+        #expect(AmiiboFilter() == AmiiboFilter())
+        #expect(AmiiboFilter(name: "zelda") == AmiiboFilter(name: "zelda"))
+        #expect(AmiiboFilter(name: "zelda") != AmiiboFilter(name: "mario"))
+        #expect(AmiiboFilter() != AmiiboFilter(showGames: true))
+    }
+
+    @Test("compares key-name filters by value")
+    func keyNameFilterEquality() {
+        // GIVEN
+        // WHEN
+        // THEN
+        #expect(AmiiboSeriesFilter() == AmiiboSeriesFilter())
+        #expect(AmiiboSeriesFilter(key: "0x01") == AmiiboSeriesFilter(key: "0x01"))
+        #expect(AmiiboSeriesFilter(key: "0x01") != AmiiboSeriesFilter(name: "0x01"))
+        #expect(AmiiboTypeFilter(name: "Card") != AmiiboTypeFilter(name: "Figure"))
+        #expect(GameCharacterFilter(key: "0x0100") != GameCharacterFilter())
+        #expect(GameSeriesFilter(name: "Pikmin") == GameSeriesFilter(name: "Pikmin"))
+    }
+
+    // MARK: Hashable tests
+
+    @Test("hashes equal filters alike")
+    func filterHashing() {
+        // GIVEN
+        let amiiboFilters: Set = [AmiiboFilter(name: "zelda"), AmiiboFilter(name: "zelda"), AmiiboFilter(name: "mario")]
+        let seriesFilters: Set = [AmiiboSeriesFilter(key: "0x01"), AmiiboSeriesFilter(key: "0x01"), AmiiboSeriesFilter()]
+
+        // WHEN
+        // THEN
+        #expect(amiiboFilters.count == 2)
+        #expect(seriesFilters.count == 2)
+    }
+
+}

Tests/AmiiboService/Cases/Public/Models/ModelConformanceTests.swift

@@ -0,0 +1,84 @@
+// ===----------------------------------------------------------------------===
+//
+// 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 AmiiboService
+import Foundation
+import Testing
+
+@Suite("Model conformances")
+struct ModelConformanceTests {
+
+    // MARK: Identifiable tests
+
+    @Test("identifies an amiibo by its identifier")
+    func amiiboID() {
+        // GIVEN
+        let amiibos = Fixtures.amiibos
+
+        // WHEN
+        // THEN
+        #expect(amiibos.map(\.id) == amiibos.map(\.identifier))
+    }
+
+    @Test("identifies key-name models by their keys")
+    func keyNameIDs() {
+        // GIVEN
+        // WHEN
+        // THEN
+        #expect(Fixtures.amiiboSeries.map(\.id) == Fixtures.amiiboSeries.map(\.key))
+        #expect(Fixtures.amiiboTypes.map(\.id) == Fixtures.amiiboTypes.map(\.key))
+        #expect(Fixtures.gameCharacters.map(\.id) == Fixtures.gameCharacters.map(\.key))
+        #expect(Fixtures.gameSeries.map(\.id) == Fixtures.gameSeries.map(\.key))
+    }
+
+    // MARK: Codable tests
+
+    @Test("round-trips amiibos through JSON")
+    func amiibosRoundTrip() throws {
+        // GIVEN
+        let amiibos = Fixtures.amiibos
+
+        // WHEN
+        let decoded = try roundTrip(amiibos)
+
+        // THEN
+        #expect(decoded == amiibos)
+        #expect(decoded.first?.platform?.switch.first?.usages?.isEmpty == false)
+    }
+
+    @Test("round-trips key-name models through JSON")
+    func keyNameRoundTrip() throws {
+        // GIVEN
+        // WHEN
+        // THEN
+        #expect(try roundTrip(Fixtures.amiiboSeries) == Fixtures.amiiboSeries)
+        #expect(try roundTrip(Fixtures.amiiboTypes) == Fixtures.amiiboTypes)
+        #expect(try roundTrip(Fixtures.gameCharacters) == Fixtures.gameCharacters)
+        #expect(try roundTrip(Fixtures.gameSeries) == Fixtures.gameSeries)
+    }
+
+}
+
+// MARK: - Helpers
+
+private extension ModelConformanceTests {
+
+    // MARK: Functions
+
+    /// Encodes a value to JSON and decodes it back.
+    func roundTrip<Value: Codable>(_ value: Value) throws -> Value {
+        try JSONDecoder().decode(Value.self, from: JSONEncoder().encode(value))
+    }
+
+}

Tests/AmiiboService/Cases/Public/Services/AmiiboServiceMockTests.swift

@@ -326,71 +326,3 @@ private enum Errors {
         .unknown("An underlying error description.")
     ]
 }
-
-private enum Fixtures {
-    /// Amiibo items; the first one has release dates and related games with usages.
-    static let amiibos: [Amiibo] = [
-        .init(
-            head: "01000000",
-            tail: "00040002",
-            name: "Zelda",
-            type: "Figure",
-            series: "Super Smash Bros.",
-            gameCharacter: "Zelda",
-            gameSeries: "The Legend of Zelda",
-            image: "https://raw.githubusercontent.com/N3evin/AmiiboAPI/master/images/icon_01000000-00040002.png",
-            release: .init(
-                america: Date(timeIntervalSince1970: 1_416_441_600),
-                australia: Date(timeIntervalSince1970: 1_417_564_800),
-                europe: Date(timeIntervalSince1970: 1_417_132_800),
-                japan: Date(timeIntervalSince1970: 1_417_564_800)
-            ),
-            platform: .init(
-                switch: [
-                    .init(
-                        identifiers: ["01007EF00011E000"],
-                        name: "The Legend of Zelda: Breath of the Wild",
-                        usages: [.init(explanation: "Spawns a random selection of items.", isWriteable: false)]
-                    )
-                ],
-                wiiU: [
-                    .init(
-                        identifiers: ["0005000010145000"],
-                        name: "Super Smash Bros. for Wii U",
-                        usages: [.init(explanation: "Unlocks a figure player.", isWriteable: true)]
-                    )
-                ]
-            )
-        ),
-        .init(
-            head: "00000000",
-            tail: "00000002",
-            name: "Mario",
-            type: "Figure",
-            series: "Super Smash Bros.",
-            gameCharacter: "Mario",
-            gameSeries: "Super Mario",
-            image: "https://raw.githubusercontent.com/N3evin/AmiiboAPI/master/images/icon_00000000-00000002.png"
-        )
-    ]
-    /// Amiibo series.
-    static let amiiboSeries: [AmiiboSeries] = [
-        .init(key: "0x00", name: "Super Smash Bros."),
-        .init(key: "0x01", name: "Super Mario")
-    ]
-    /// Amiibo types.
-    static let amiiboTypes: [AmiiboType] = [
-        .init(key: "0x00", name: "Figure"),
-        .init(key: "0x01", name: "Card")
-    ]
-    /// Game characters.
-    static let gameCharacters: [GameCharacter] = [
-        .init(key: "0x0000", name: "Mario"),
-        .init(key: "0x0100", name: "Zelda")
-    ]
-    /// Game series.
-    static let gameSeries: [GameSeries] = [
-        .init(key: "0x000", name: "Super Mario"),
-        .init(key: "0x010", name: "The Legend of Zelda")
-    ]
-}

Tests/AmiiboService/Helpers/Fixtures/Fixtures.swift

@@ -0,0 +1,85 @@
+// ===----------------------------------------------------------------------===
+//
+// 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 AmiiboService
+import Foundation
+
+/// Ready-made models for testing purposes.
+enum Fixtures {
+    /// Amiibo items; the first one has release dates and related games with usages.
+    static let amiibos: [Amiibo] = [
+        .init(
+            head: "01000000",
+            tail: "00040002",
+            name: "Zelda",
+            type: "Figure",
+            series: "Super Smash Bros.",
+            gameCharacter: "Zelda",
+            gameSeries: "The Legend of Zelda",
+            image: "https://raw.githubusercontent.com/N3evin/AmiiboAPI/master/images/icon_01000000-00040002.png",
+            release: .init(
+                america: Date(timeIntervalSince1970: 1_416_441_600),
+                australia: Date(timeIntervalSince1970: 1_417_564_800),
+                europe: Date(timeIntervalSince1970: 1_417_132_800),
+                japan: Date(timeIntervalSince1970: 1_417_564_800)
+            ),
+            platform: .init(
+                switch: [
+                    .init(
+                        identifiers: ["01007EF00011E000"],
+                        name: "The Legend of Zelda: Breath of the Wild",
+                        usages: [.init(explanation: "Spawns a random selection of items.", isWriteable: false)]
+                    )
+                ],
+                wiiU: [
+                    .init(
+                        identifiers: ["0005000010145000"],
+                        name: "Super Smash Bros. for Wii U",
+                        usages: [.init(explanation: "Unlocks a figure player.", isWriteable: true)]
+                    )
+                ]
+            )
+        ),
+        .init(
+            head: "00000000",
+            tail: "00000002",
+            name: "Mario",
+            type: "Figure",
+            series: "Super Smash Bros.",
+            gameCharacter: "Mario",
+            gameSeries: "Super Mario",
+            image: "https://raw.githubusercontent.com/N3evin/AmiiboAPI/master/images/icon_00000000-00000002.png"
+        )
+    ]
+    /// Amiibo series.
+    static let amiiboSeries: [AmiiboSeries] = [
+        .init(key: "0x00", name: "Super Smash Bros."),
+        .init(key: "0x01", name: "Super Mario")
+    ]
+    /// Amiibo types.
+    static let amiiboTypes: [AmiiboType] = [
+        .init(key: "0x00", name: "Figure"),
+        .init(key: "0x01", name: "Card")
+    ]
+    /// Game characters.
+    static let gameCharacters: [GameCharacter] = [
+        .init(key: "0x0000", name: "Mario"),
+        .init(key: "0x0100", name: "Zelda")
+    ]
+    /// Game series.
+    static let gameSeries: [GameSeries] = [
+        .init(key: "0x000", name: "Super Mario"),
+        .init(key: "0x010", name: "The Legend of Zelda")
+    ]
+}