Lee-W commented on PR #43978:
URL: https://github.com/apache/airflow/pull/43978#issuecomment-2484629746

   > > Maybe add one then - following the same structure in `tests` as you have 
for the source
   > 
   > Sure. Since it's an abstract class, I'm thinking I'll have to create a 
mock implementation for the test. I'll also need to mock `check_query_exists` 
so that it returns `None` .Something like:
   > 
   > ```python
   > class LazySelectSequenceInstance(LazySelectSequence[Any]):
   >     ... # implement required methods
   > 
   > @mock.patch("check_query_exists", lambda x, y: None):
   > def test_lazy_select_sequence():
   >     lss = LazySelectSequenceInstance(...)
   >     assert bool(lss) == False
   > ```
   > 
   > Does this make sense?
   
   Sounds reasonable. We already have a mock class here 
https://github.com/apache/airflow/blob/f5abe506fc6ba22a8b8efb0d4784dd85eaa90af4/tests/serialization/test_serialized_objects.py#L170
   probably we could do something similar here as well?


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