Follow-up from "Allow default color mode to be set"

The following discussions from !161325 (merged) should be addressed:

  • @hfyngvason started a discussion: (+2 comments)

    That there is no example block in gitlab.yml.example

  • @eduardosanz started a discussion: (+1 comment)

    @jrushford, please could you create a test that check the presence of gl-dark class in the sign-in page (<html> element) if the default_color_mode option is 2?

  • @eduardosanz create a unit test for default_id (using the public method default): !161325 (diffs)

Edited by Eduardo Sanz García