Add GetPublicKeyFromContact functor

Sources/ElixxirDAppsSDK/Legacy/ContactPubkeyProvider.swift → Sources/ElixxirDAppsSDK/GetPublicKeyFromContact.swift

 import Bindings
+import XCTestDynamicOverlay
 
-public struct ContactPubkeyProvider {
-  public var get: (Data) throws -> Data
+public struct GetPublicKeyFromContact {
+  public var run: (Data) throws -> Data
 
   public func callAsFunction(contact: Data) throws -> Data {
-    try get(contact)
+    try run(contact)
   }
 }
 
-extension ContactPubkeyProvider {
-  public static let live = ContactPubkeyProvider { contact in
+extension GetPublicKeyFromContact {
+  public static let live = GetPublicKeyFromContact { contact in
     var error: NSError?
-    let pubkey = BindingsGetPubkeyFromContact(contact, &error)
+    let key = BindingsGetPubkeyFromContact(contact, &error)
     if let error = error {
       throw error
     }
-    guard let pubkey = pubkey else {
+    guard let key = key else {
       fatalError("BindingsGetPubkeyFromContact returned `nil` without providing error")
     }
-    return pubkey
+    return key
   }
 }
 
-#if DEBUG
-extension ContactPubkeyProvider {
-  public static let failing = ContactPubkeyProvider { _ in
-    struct NotImplemented: Error {}
-    throw NotImplemented()
-  }
+extension GetPublicKeyFromContact {
+  public static let unimplemented = GetPublicKeyFromContact(
+    run: XCTUnimplemented("\(Self.self)")
+  )
 }
-#endif