[fix] attestation based unit test updates

Author: dtsiflit

Sources/Main/AttestationBasedClient/ClientAttestation.swift

@@ -39,7 +39,7 @@ public struct ClientAttestationJWT {
 
     /*
     guard payload[JWTClaimNames.subject].string != nil else {
-      throw AttestationError.missingSubject
+      throw ClientAttestationError.missingSubject
     }
      */
 
@@ -50,11 +50,10 @@ public struct ClientAttestationJWT {
     guard cnf[JWTClaimNames.JWK] != nil else {
       throw ClientAttestationError.missingJwkClaim
     }
-    /*
-    guard payload[JWTClaimNames.expirationTime].string != nil else {
-      throw AttestationError.missingExpirationClaim
+
+    guard payload[JWTClaimNames.expirationTime].number != nil else {
+      throw ClientAttestationError.missingExpirationClaim
     }
-     */
   }
 
   public var clientId: ClientId {

Tests/Helpers/SelfSignedClientAttestation.swift

@@ -39,6 +39,8 @@ internal func selfSignedClient(
   let payload: Payload = try! .init([
     "iss": clientId,
     "clientId": clientId,
+    "sub": clientId,
+    "exp": 1800000000,
     "cnf": [
       "jwk": ECPublicKey(
         publicKey: try! KeyController.generateECDHPublicKey(