mergetools / kompareon commit tests: make use of the test_must_be_empty function (d3c6751)
   1can_merge () {
   2        return 1
   3}
   4
   5diff_cmd () {
   6        "$merge_tool_path" "$LOCAL" "$REMOTE"
   7}
   8
   9exit_code_trustable () {
  10        true
  11}