On Thu, Sep 06 2018, SZEDER Gábor wrote: > +# Create a file named as $1 with content read from stdin. > +# Set the file's mtime to a few seconds in the past to avoid racy situations. > +create_file () { Nit: Would be easier to read in the future as e.g. s/create_file/create_old_file/ or something like that. I.e. so you can see at a glance from the tests themselves what this is doing. > test_expect_success 'modify original file, base index untouched' ' > - echo modified >one && > + echo modified |create_file one && Style nit: missing whitespace after "|", i.e. should be "echo modified | create_file one".