Add render_patterns to project test suite & contributing notes

Author: thibaudcolas

CONTRIBUTING.md

@@ -20,7 +20,10 @@ Then you can install the dependencies and run the test app:
 
 ```sh
 poetry install
-poetry run 'django-admin runserver --settings=tests.settings --pythonpath=.'
+# Start the server for testing:
+poetry run django-admin runserver --settings=tests.settings --pythonpath=.
+# Or to try out the render_patterns command:
+poetry run django-admin render_patterns --settings=tests.settings --pythonpath=. --dry-run --verbosity 2
 ```
 
 ### Run a local build with docker

pattern_library/management/commands/render_patterns.py

@@ -55,7 +55,6 @@ def handle(self, **options):
             if self.wrap_fragments:
                 self.stderr.write('Writing fragment patterns wrapped in base template')
 
-
         # Resolve the output dir according to the directory the command is run from.
         parent_dir = Path.cwd().joinpath(self.output_dir)
 

tox.ini

@@ -9,6 +9,7 @@ install_command =
     ./tox_install.sh {packages}
 commands =
     poetry run ./runtests.py
+    poetry run django-admin render_patterns --settings=tests.settings --pythonpath=. --dry-run
 deps =
     dj22: Django>=2.2,<2.3
     dj30: Django>=3.0,<3.1