diff --git a/Tests/WebAuthnTests/Utils/TestModels/TestKeyConfiguration.swift b/Tests/WebAuthnTests/Utils/TestModels/TestKeyConfiguration.swift
index 7420e8b..e8a0a73 100644
--- a/Tests/WebAuthnTests/Utils/TestModels/TestKeyConfiguration.swift
+++ b/Tests/WebAuthnTests/Utils/TestModels/TestKeyConfiguration.swift
@@ -13,13 +13,13 @@
 
 import Foundation
 
-protocol TestSigner {
+protocol TestSigner: Sendable {
     static func sign(data: Data) throws -> [UInt8]
     
     static var signature: [UInt8] { get throws }
 }
 
-struct TestKeyConfiguration {
+struct TestKeyConfiguration: Sendable {
     var signer: any TestSigner.Type
     var credentialPublicKeyBuilder: TestCredentialPublicKeyBuilder
     var authDataBuilder: TestAuthDataBuilder
diff --git a/Tests/WebAuthnTests/WebAuthnManagerRegistrationTests.swift b/Tests/WebAuthnTests/WebAuthnManagerRegistrationTests.swift
index bf9ecbb..4efd893 100644
--- a/Tests/WebAuthnTests/WebAuthnManagerRegistrationTests.swift
+++ b/Tests/WebAuthnTests/WebAuthnManagerRegistrationTests.swift
@@ -398,7 +398,6 @@ struct WebAuthnManagerRegistrationTests {
             rawID: credentialID,
             attestationObject: attestationObject
         )
-        #expect(credential != nil)
 
         #expect(credential.id == credentialID.base64EncodedString().asString())
         #expect(credential.publicKey == credentialPublicKey)