code: def test_agent_n_variables_setter():
      try:
          new_agent = agent.Agent(0.0, 1, 0, 1)
      except:
          new_agent = agent.Agent(1, 1, 0, 1)
  
      try:
          new_agent = agent.Agent(0, 4, 0, 1)
      except:
          new_agent = agent.Agent(1, 1, 0, 1)
  
      assert new_agent.n_variables == 1
  
imports: import sys
  import numpy
  from opytimizer.core import agent
label_desc: Use image node_id 2 for calling a global function with example usage: test_agent_n_variables_setter() without return types