Improve tests #2
Description
Currently the test_lambda_function.py test always passes, even if the pipeline raises an error and doesn't produce any data. This is misleading, and can easily result in users thinking that their AWS ingests will work and cause confusion.
This is not good practice, as we not only want to test that the pipeline can run, but we also want to test that it actually produces files and that the data produced in those files meets expectations. This should be updated to reflect better development practices.