Add SendImage to AppCore

Examples/xx-messenger/Sources/AppCore/SendImage/SendImage.swift

+import Foundation
+import XCTestDynamicOverlay
+import XXClient
+import XXMessengerClient
+import XXModels
+
+public struct SendImage {
+  public typealias OnError = (Error) -> Void
+  public typealias Completion = () -> Void
+
+  public var run: (Data, Data, @escaping OnError, @escaping Completion) -> Void
+
+  public func callAsFunction(
+    _ image: Data,
+    to recipientId: Data,
+    onError: @escaping OnError,
+    completion: @escaping Completion
+  ) {
+    run(image, recipientId, onError, completion)
+  }
+}
+
+extension SendImage {
+  public static func live(
+    messenger: Messenger,
+    db: DBManagerGetDB,
+    now: @escaping () -> Date
+  ) -> SendImage {
+    SendImage { image, recipientId, onError, completion in
+      // TODO: implement sending image
+      completion()
+    }
+  }
+}
+
+extension SendImage {
+  public static let unimplemented = SendImage(
+    run: XCTUnimplemented("\(Self.self)")
+  )
+}

Examples/xx-messenger/Tests/AppCoreTests/SendImage/SendImageTests.swift

+import CustomDump
+import XCTest
+import XXClient
+import XXMessengerClient
+import XXModels
+@testable import AppCore
+
+final class SendImageTests: XCTestCase {
+  func testSend() {
+    let image = "image-data".data(using: .utf8)!
+    let recipientId = "recipient-id".data(using: .utf8)!
+
+    var actions: [Action] = []
+
+    let messenger: Messenger = .unimplemented
+    let db: DBManagerGetDB = .unimplemented
+    let now: () -> Date = Date.init
+    let send: SendImage = .live(messenger: messenger, db: db, now: now)
+
+    actions = []
+    send(
+      image,
+      to: recipientId,
+      onError: { error in
+        actions.append(.didFail(error as NSError))
+      },
+      completion: {
+        actions.append(.didComplete)
+      }
+    )
+
+    XCTAssertNoDifference(actions, [
+      .didComplete
+    ])
+  }
+}
+
+private enum Action: Equatable {
+  case didFail(NSError)
+  case didComplete
+}