* interfaces_file: fixed unit tests and added README, added test cases for #3862
* typo fix for interfaces_file unit tests README.md
Co-authored-by: Felix Fontein <felix@fontein.de>
* typo fix for interfaces_file unit tests README.md
Co-authored-by: Felix Fontein <felix@fontein.de>
* typo fix for interfaces_file unit tests README.md
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Felix Fontein <felix@fontein.de>