[librsvg] (3 commits) Non-fast-forward update to branch refactor-test-utils

[Sven Neumann <sneumann src gnome org>]

The branch 'refactor-test-utils' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  35ea4f4... Refactor test_utils and move it to the tests
  b305404... Implement PngPredicate.with_contents() using tests::referen
  cb78faf... Add test to verify that rsvg-convert renders the background

Commits added to the branch:

  25aad2a... Refactor test_utils and move it to the tests
  bfafd58... Implement PngPredicate.with_contents() using tests::referen
  7aad1b5... Add test to verify that rsvg-convert renders the background