Hi,

You can mock dbutils. An easy way to do it is to:

• Try to receive dbutils as a parameter in your functions (inject it) instead of using it globally. This way your code is more testable and you won't to do patching which is a bit more cumbersome.
• Use a mock library. Unittest.mock is the simplest approach
• Call your function passing down a mock instead of the actual dbutils

Example:

• your library under test

def my_function(dbutils):
   ...
   dbutils.fs.ls("/tmp")  # this is using the local variable received by parameter
   ...

• your notebook

from my_library import my_function
 
...
my_function(dbutils)  # this refers to the global dbutils variable

• your test

from unittest.mock import MagicMock
 
from my_library import my_function
 
 
def test_my_function_calls_dbutils():
   mock_dbutils = MagicMock()
 
   my_function(dbutils=mock_dbutils)
 
   mock_dbutils.fs.ls.assert_called_once_with("/tmp")