I am trying to test my code that gets all the user details from Keycloak using the Keycloak library. But I keep seeing this error. can anyone help me with this?

Test code

trait Setup {
    val keycloak: Keycloak = mock[Keycloak]
    val keycloakBuilder: KeycloakBuilder = mock[KeycloakBuilder]
    val service = new NewUserService(conf)
    val restEasy: ResteasyClientBuilder = mock[ResteasyClientBuilder]
    val restEasyClient: ResteasyClient = mock[ResteasyClient]
    val realmResource: RealmResource = mock[RealmResource]
    val usersResource: UsersResource = mock[UsersResource]
  }
  "NewUserService#getAllUsers" should {

    "return all users" in new Setup {
      when(restEasy.build()) thenReturn restEasyClient
      when(keycloakBuilder.build()) thenReturn keycloak
      when(restEasy.build()) thenReturn restEasyClient
      when(keycloak.realm(any[String])) thenReturn realmResource
      when(realmResource.users()) thenReturn usersResource
      when(usersResource.list()) thenReturn List(any[UserRepresentation]).asJava
      whenReady(service.getAllUsers) { result =>
        assert(result.isRight)
      }
    }
  }

NewUserService.scala

class NewUserService(conf: Config)(implicit val ec: ExecutionContext, logger: LoggingAdapter) {

  def getAllUsers: Future[Either[NewUserServiceError, util.List[idm.UserRepresentation]]] = {
    val keycloakConf = conf.getConfig("keycloak")
    val serverUrl = keycloakConf.getString("realmServerURL")
    val realm = keycloakConf.getString("realmName")
    val userName = keycloakConf.getString("username")
    val password = keycloakConf.getString("password")
    val clientId = keycloakConf.getString("clientId")
    val clientSecret = keycloakConf.getString("clientSecret")
    val keycloakBuild = KeycloakBuilder
      .builder()
      .serverUrl(serverUrl)
      .realm(realm)
      .username(userName)
      .password(password)
      .clientId(clientId)
      .clientSecret(clientSecret)
      .resteasyClient(new ResteasyClientBuilder().connectionPoolSize(20).build())
      .build()
    val usersList = Future(Try(keycloakBuild.realm("knoldus").users().list()))
    usersList.map {
      case Success(users) =>
        users.asRight
      case Failure(exception) =>
        logger.error(s"Unable to get user details $exception")
        NewUserServiceError.UserNotFoundError.asLeft
    }
  }
}

object NewUserService {

  sealed trait NewUserServiceError

  object NewUserServiceError {
    case object UserNotFoundError extends NewUserServiceError

    case object InternalServerError extends NewUserServiceError
  }

}

I get the connection refused error when i donot start my keycloak server at 8080 port. And when i start it on 8080 port i see user not found error. Please tell me what am i doing wrong.

Error

Unable to get user details javax.ws.rs.ProcessingException: RESTEASY004655: Unable to invoke request: org.apache.http.conn.HttpHostConnectException: Connect to 127.0.0.1:8080 [/127.0.0.1] failed: Connection refused

Unable to get user details javax.ws.rs.ProcessingException: javax.ws.rs.NotFoundException: HTTP 404 Not Found