Find all __init__ modules for packages named 'tests' and clear their contents

empty_tests_init_files.sh

find . \
  -path "*/tests/*" \
  -type f \
  -name "__init__.py" \
  -exec sh -c 'echo "" > {}' \;

prefix_test_files_for_autodiscovery.sh

find . \
  -path "*/tests/*" 
  -type f 
  -name "*.py" \
  \! -name "__init__.py" 
  -execdir git mv "{}" test_"{}" \;