class_docstr: construct_dgl_server_env_vars()
class_docstr_tok: ["construct_dgl_server_env_vars","(",")"]
code: def test_simple(self):
      self.assertEqual(
          construct_dgl_server_env_vars(
              num_samplers=2,
              num_server_threads=3,
              tot_num_clients=4,
              part_config="path/to/part.config",
              ip_config="path/to/ip.config",
              num_servers=5,
              graph_format="csc",
          ),
          (
              "DGL_ROLE=server "
              "DGL_NUM_SAMPLER=2 "
              "OMP_NUM_THREADS=3 "
              "DGL_NUM_CLIENT=4 "
              "DGL_CONF_PATH=path/to/part.config "
              "DGL_IP_CONFIG=path/to/ip.config "
              "DGL_NUM_SERVER=5 "
              "DGL_GRAPH_FORMAT=csc "
          ),
      )
  
file_path: dgl/tests/tools/test_launch.py
imports: import json
  import os
  import tempfile
  import unittest
  from launch import *
label_desc: Use image node_id 1 for calling the TestConstructDglServerEnvVars obj's underlying member method code with example usage: obj.test_simple() without return types