Debugging without access to these two functions may be a pain in the neck. Fortunately, there is a simple solution, you can apply in just a few seconds.
Go to your config/test.exs file and you'll probably see:
# Print only warnings and errors during test config :logger, level: :warn
The only thing you have to do is change it to:
config :logger, backends: [:console], compile_time_purge_level: :debug
After your work, I would recommend you to revert changes.