diff --git a/Tests/XXMessengerClientTests/TestHelpers/TestDoubles.swift b/Tests/XXMessengerClientTests/TestHelpers/TestDoubles.swift
index c9a90bde352a9da4ac0c359c26fed8e1a89d9f8f..93110b2efb3698aec563f2f6cc9a0e51f03189a9 100644
--- a/Tests/XXMessengerClientTests/TestHelpers/TestDoubles.swift
+++ b/Tests/XXMessengerClientTests/TestHelpers/TestDoubles.swift
@@ -23,3 +23,16 @@ extension BackupParams {
     username: "stub-username"
   )
 }
+
+extension ReceivedFile {
+  static func stub(_ id: Int) -> ReceivedFile {
+    ReceivedFile(
+      transferId: "transfer-id-\(id)".data(using: .utf8)!,
+      senderId: "sender-id-\(id)".data(using: .utf8)!,
+      preview: "preview-\(id)".data(using: .utf8)!,
+      name: "name-\(id)",
+      type: "type-\(id)",
+      size: id
+    )
+  }
+}
diff --git a/Tests/XXMessengerClientTests/Utils/ReceiveFileCallbacksRegistryTests.swift b/Tests/XXMessengerClientTests/Utils/ReceiveFileCallbacksRegistryTests.swift
index e99890b47188476af054df9878d287a4d9481b3d..87733caac8992f8eebfb8ee52497eb79437745be 100644
--- a/Tests/XXMessengerClientTests/Utils/ReceiveFileCallbacksRegistryTests.swift
+++ b/Tests/XXMessengerClientTests/Utils/ReceiveFileCallbacksRegistryTests.swift
@@ -42,16 +42,3 @@ final class ReceiveFileCallbacksRegistryTests: XCTestCase {
     XCTAssertNoDifference(secondCallbackDidHandle, [firstResult, secondResult])
   }
 }
-
-private extension ReceivedFile {
-  static func stub(_ id: Int) -> ReceivedFile {
-    ReceivedFile(
-      transferId: "transfer-id-\(id)".data(using: .utf8)!,
-      senderId: "sender-id-\(id)".data(using: .utf8)!,
-      preview: "preview-\(id)".data(using: .utf8)!,
-      name: "name-\(id)",
-      type: "type-\(id)",
-      size: id
-    )
-  }
-}