new_contents: import unittest
  from biokbase.narrative.contents.manager_util import base_model
  
  class ManagerUtilTestCase(unittest.TestCase):
      def test_base_model(self):
          name = 'foo'
          path = 'bar'
          model = base_model(name, path)
          self.assertIn('name', model)
          self.assertEqual(model['name'], name)
          self.assertIn('path', model)
          self.assertEqual(model['path'], path)
          self.assertIn('last_modified', model)
          self.assertEqual(model['last_modified'], '00-00-0000')
          self.assertIn('created', model)
          self.assertEqual(model['created'], '00-00-0000')
          self.assertIn('content', model)
          self.assertIsNone(model['content'])
          self.assertIn('format', model)
          self.assertIsNone(model['format'])
          self.assertIn('mimetype', model)
          self.assertIsNone(model['mimetype'])
          self.assertIn('writable', model)
          self.assertFalse(model['writable'])
          self.assertIn('type', model)
          self.assertIsNone(model['type'])
  
subject: add manager util test