You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: kv_test.go
    path of file: ./repos/etcd/tests/integration/proxy/grpcproxy
    
    the code of the file until where you have to start completion: // Copyright 2016 The etcd Authors
//
// Licensed under the Apache 
    
func TestKVProxyRange(t *testing.T) {
	integration2.BeforeTest(t)

	clus := integration2.NewCluster(t, &integration2.ClusterConfig{Size: 1})
	defer clus.Terminate(t)

	kvts := newKVProxyServer([]string{clus.Members[0].GRPCURL()}, t)
	defer kvts.close()

	// create a client and try to get key from proxy.
	cfg := clientv3.Config{
		Endpoints:   []string{kvts.l.Addr().String()},
		DialTimeout: 5 * time.Second,
	}
	client, err := integration2.NewClient(t, cfg)
	if err != nil {
		t.Fatalf("err = %v, want nil", err)
	}
	_, err = client.Get(context.Background(), "foo")
	if err != nil {
		t.Fatalf("err = %v, want nil", err)
	}
	client.Close()
}