Subject of the issue

You can't use the diff method with multiple paths.

Your environment

• git version 2.32.0 (Apple Git-132)
• git (1.10.0)
• ruby 3.0.3p157 (2021-11-24 revision 3fb7d2cadc) [arm64-darwin21]

Steps to reproduce

puts(Git.open('.').diff.path('dir_a dir_b'))

Expected behaviour

The diff for the files under the directories dir_a and dir_b should be displayed.

Actual behaviour

No diff is displayed.