code: def test_each_plugin_has_an_export(self):
      for plugin in self.plugins:
          self.assertIsInstance(
              getattr(self.module, plugin), collections.abc.Callable
          )
  
imports: import collections.abc
  import sys
  import unittest
  import tensorboard.summary
  import tensorboard.summary.v1
  import tensorboard.summary.v2
label_desc: Use image node_id 1 for calling the SummaryExportsBaseTest obj's underlying member method code with example usage: obj.test_each_plugin_has_an_export() without return types