code: def test_constant(self):
      self.start_tests(name="constant")
  
      exploration = 0.1
      self.float_unittest(exploration=exploration)
  
      horizon = 4
      self.int_unittest(horizon=horizon)
  
file_path: tensorforce/test/test_parameters.py
imports: import unittest
  from test.unittest_base import UnittestBase
label_desc: Use image node_id 3 for calling the TestParameters obj's underlying member method code with example usage: obj.test_constant() without return types