code: def test_show_knowledge_bases(self):
      # create the knowledge base
      sql = f"""
              CREATE KNOWLEDGE BASE test_kb
              USING
              MODEL = {self.embedding_model_name},
              STORAGE = {self.vector_database_name}.{self.vector_database_table_name}
          """
      self.run_sql(sql)
  
      # show knowledge bases
      sql = """
              SHOW KNOWLEDGE BASES
          """
      df = self.run_sql(sql)
      assert df.shape[0] == 1
  
imports: import tempfile
  import time
  from unittest.mock import patch
  import pandas
  import pytest
  from mindsdb_sql import parse_sql
  from mindsdb.interfaces.storage.db import KnowledgeBase
  from .executor_test_base import BaseExecutorTest
label_desc: Use image node_id 11 for calling the TestKnowledgeBase obj's underlying member method code with example usage: obj.test_show_knowledge_bases() without return types