result: failed to start with message "already in progress?"
expected: start normally
option 1. Should check that no operation yet started and cleanup all in case of error and failed before the starting
option 2: verify input branches so that error is handled nicel
result: failed to start with message "already in progress?"
expected: start normally
option 1. Should check that no operation yet started and cleanup all in case of error and failed before the starting option 2: verify input branches so that error is handled nicel