code: def test_trigger(self):
      trigger = type(self).trigger_type(self.key, trigger=self.interval)
      self._test_trigger(
          trigger, self.key, self.accuracies, self.expected
      )
  
file_path: chainer/tests/chainer_tests/training_tests/triggers_tests/test_minmax_trigger.py
imports: import tempfile
  import unittest
  from chainer import serializers
  from chainer import testing
  from chainer.training import triggers
label_desc: Use image node_id 2 for calling the BestValueTriggerTester obj's underlying member method code with example usage: obj.test_trigger() without return types