code: def test_agent_mapping_setter():
      new_agent = agent.Agent(1, 1, 0, 1)
  
      try:
          new_agent.mapping = "a"
      except:
          new_agent.mapping = ["x1"]
  
      assert len(new_agent.mapping) == 1
  
      try:
          new_agent.mapping = []
      except:
          new_agent.mapping = ["x1"]
  
      assert len(new_agent.mapping) == 1
  
imports: import sys
  import numpy
  from opytimizer.core import agent
label_desc: Use image node_id 16 for calling a global function with example usage: test_agent_mapping_setter() without return types