* Do not remove non-ASCII Unicode from multi-line string output.
* Added basic tests.
* Add Unicode test.
* Simplify tests, avoid later Jinja features.
* Refactor.
* Make use diy tests use callback test framework as well.
* Remove color codes.
* Work around stable-2.9 bug.
* Simplify again.
(cherry picked from commit 0a7ed3b019)
Co-authored-by: Felix Fontein <felix@fontein.de>
