new_contents: """ Unit tests for action caller sample"""
  
  from django.test import TestCase
  
  from plugin import plugin_registry
  
  class SampleApiCallerPluginTests(TestCase):
      """ Tests for SampleApiCallerPluginTests """
  
      def test_return(self):
          """check if the external api call works"""
          # The plugin should be defined
          self.assertIn('sample-api-caller', plugin_registry.plugins)
          plg = plugin_registry.plugins['sample-api-caller']
          self.assertTrue(plg)
  
          # do an api call
          result = plg.get_external_url()
          self.assertTrue(result)
          self.assertIn('data', result,)
  
subject: add integration test for plugin