code: def setUp(self):
      self.env = StreamExecutionEnvironment.get_execution_environment()
      self.execution_config = self.env.get_config()
  
imports: from pyflink.datastream import StreamExecutionEnvironment
  from pyflink.common import ExecutionConfig, RestartStrategies, ExecutionMode, Configuration
  from pyflink.java_gateway import get_gateway
  from pyflink.testing.test_case_utils import PyFlinkTestCase
  from pyflink.util.java_utils import get_j_env_configuration
label_desc: Use image node_id 1 for calling the ExecutionConfigTests obj's underlying member method code with example usage: obj.setUp() without return types