Add test case dark-listing

tests/dark-listing/conf.py

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+extensions = [
+    'sphinx.ext.autodoc',
+]
+
+master_doc = "index"
+html_theme = "furo"
+
+autodoc_preserve_defaults = True
+default_role = 'any'
+
+# HTML theme
+html_theme = 'furo'
+html_logo = "images/logo.svg"
+
+extensions += ['jaraco.tidelift']

tests/dark-listing/index.rst

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+=======
+Artwork
+=======
+
+.. code-block:: text
+
+   Permission is hereby granted, free of charge, to any person obtaining a copy
+   of this software and associated documentation files (the "Software"), to
+   deal in the Software without restriction, including without limitation the
+   rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+   sell copies of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+   IN THE SOFTWARE.
+
+   THE USAGE OF THIS LOGO AND ARTWORK DOES NOT INDICATE ENDORSEMENT BY THE
+   SETUPTOOLS PROJECT.

tests/dark-listing/requirements.txt

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+sphinx
+furo
+pygments-github-lexers
+-e ../..