code: def test_view(self, mock_handler):
      from mindsdb.utilities.exception import (
          EntityExistsError,
          EntityNotExistsError,
      )
  
      df = pd.DataFrame(
          [
              {"a": 1, "b": "one"},
              {"a": 2, "b": "two"},
              {"a": 1, "b": "three"},
          ]
      )
      self.set_handler(mock_handler, name="pg", tables={"tasks": df})
      sql = """
              CREATE VIEW test_view AS (
              SELECT * FROM pg.tasks
              )
          """
      self.execute(sql)
  
      # create the same view without if not exists throws an error
      with pytest.raises(EntityExistsError):
          self.execute(sql)
  
      # create the same view with if not exists doesn't throw an error
      self.execute(
          """
              CREATE VIEW IF NOT EXISTS test_view AS (
              SELECT * FROM pg.tasks
              )
          """
      )
  
      # create a view with if not exists should indeed create a new view
      self.execute(
          """
              CREATE VIEW IF NOT EXISTS test_view2 AS (
              SELECT * FROM pg.tasks
              )
          """
      )
  
      # check that the view was indeed created
      ret = self.execute(
          """
              SHOW FULL TABLES
              WHERE tables_in_mindsdb = 'test_view2'
          """
      )
      assert len(ret.data) == 1
  
      # drop the view
      self.execute("DROP VIEW test_view2")
  
      # check that the view was indeed dropped
      ret = self.execute(
          """
              SHOW FULL TABLES
              WHERE tables_in_mindsdb = 'test_view2'
          """
      )
      assert len(ret.data) == 0
  
      # drop again without if exists should throw an error
      sql = """
              DROP VIEW test_view2
          """
      with pytest.raises(EntityNotExistsError):
          self.execute("DROP VIEW test_view2")
  
      # drop again with if exists should not throw an error
      self.execute("DROP VIEW IF EXISTS test_view2")
  
imports: from unittest.mock import patch
  import datetime
  import tempfile
  import pytest
  import pandas
  import numpy
  from mindsdb_sql.render.sqlalchemy_render import SqlalchemyRender
  from mindsdb.api.executor.utilities.sql import query_df
  from mindsdb.api.mysql.mysql_proxy.utilities.lightwood_dtype import dtype
  from .executor_test_base import BaseExecutorMockPredictor
label_desc: Use image node_id 7 for calling the TestIfExistsIfNotExists obj's underlying member method code with example usage: obj.test_view(mock_handler) without return types