repo_description: GoCQL Driver for Apache Cassandra®
repo_topics: cassandra client database driver go golang nosql
code: //go:build all || unit
  // +build all unit
  
  /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * Content before git sha 34fdeebefcbf183ed7f916f931aa0586fdaa1b40
   * Copyright (c) 2016, The Gocql authors,
   * provided under the BSD-3-Clause License.
   * See the NOTICE file distributed with this work for additional information.
   */
  
  package gocql
  
  import (
  	"context"
  	"testing"
  )
  
  func TestAsyncSessionInit(t *testing.T) {
  	// Build a 3 node cluster to test host metric mapping
  	var addresses = []string{
  		"127.0.0.1",
  		"127.0.0.2",
  		"127.0.0.3",
  	}
  	// only build 1 of the servers so that we can test not connecting to the last
  	// one
  	srv := NewTestServerWithAddress(addresses[0]+":0", t, defaultProto, context.Background())
  	defer srv.Stop()
  
  	// just choose any port
  	cluster := testCluster(defaultProto, srv.Address, addresses[1]+":9999", addresses[2]+":9999")
  	cluster.PoolConfig.HostSelectionPolicy = SingleHostReadyPolicy(RoundRobinHostPolicy())
  	db, err := cluster.CreateSession()
  	if err != nil {
  		t.Fatalf("NewCluster: %v", err)
  	}
  	defer db.Close()
  
  	// make sure the session works
  	if err := db.Query("void").Exec(); err != nil {
  		t.Fatalf("unexpected error from void")
  	}
  }
  