text: """
  Unittests
  =========
  
  Tests are builded using **py.test**.
  
  In data fixtures, not all settings and Sass sources will compile with
  libsass. Some of them contains some errors for test needs.
  
  * ``settings.txt``: Is not an usable settings file, just a dummy file for base backend tests;
  * ``settings.json``: Is not an usable settings file, its values are dummy pointing to path and files that does not exists;
  * ``settings_polluted.json``: Is almost equivalent of ``settings_custom.json`` but polluted with invalid setting names;
  * ``settings_custom.json``: Contain only valid settings, will compile;
  
  For Sass sources, they should all contains a comment when it contains errors.
  """