content: package org.aliyun;
  
  import org.aliyun.gsl_client.Graph;
  import org.aliyun.gsl_client.Query;
  
  import junit.framework.Test;
  import junit.framework.TestCase;
  import junit.framework.TestSuite;
  
  /**
   * Run these test cases after `python3 mock_server.py`.
   */
  public class PlanTest extends TestCase {
    public PlanTest(String testName) {
      super(testName);
    }
  
    public static Test suite() {
      return new TestSuite(PlanTest.class);
    }
  
    public void testPlan() {
      String mock_server = "http://localhost:8088";
  
      System.out.println("Start to connect...");
      Graph g = Graph.connect(mock_server);
      System.out.println("Connected...");
      try {
        Query query = g.V("user").properties(10)
            .outV("knows").sample(15).by("topk").properties(10)
            .outV("knows").sample(10).by("topk").properties(10)
            .values();
  
        String plan_str = query.getPlan().toJson().toString();
        System.out.println(plan_str);
  
      } catch (Exception e) {
        System.out.println(e.getMessage());
      }
    }
  }
  