Add pdf render tests (#6566)

* Add pdf tests

* pdf tests: Save temporary pdfs for failed test debugging

* Review comments

src/tests/conftest.py

@@ -21,6 +21,8 @@
 #
 import inspect
 import os
+import re
+from pathlib import Path
 
 import pytest
 from django.core.cache import cache
@@ -28,7 +30,6 @@ from django.test import override_settings
 from django.utils import translation
 from django_scopes import scopes_disabled
 from fakeredis import FakeRedisConnection
-from hierarkey.proxy import dirty_cache_keys
 from xdist.dsession import DSession
 
 from pretix.testutils.mock import get_redis_connection
@@ -85,6 +86,7 @@ def reset_locale():
 
 @pytest.fixture(autouse=True)
 def reset_hierarkey_cache_state():
+    from hierarkey.proxy import dirty_cache_keys
     dirty_cache_keys.set(set())
 
 
@@ -143,3 +145,23 @@ def set_lock_namespaces(request):
 @pytest.fixture
 def class_monkeypatch(request, monkeypatch):
     request.cls.monkeypatch = monkeypatch
+
+
+def pytest_addoption(parser):
+    parser.addoption(
+        '--pdf-dir', action='store', help="output dir for files generated by pdf tests", type=Path
+    )
+    parser.addoption(
+        '--pdf-tmp-keep', action='store_true', help="keep the temporary directory created for pdf tests"
+    )
+
+
+@pytest.fixture
+def pdf_dir(request, tmp_path_factory):
+    dirname = re.sub('[^a-zA-Z0-9]+', '_', request.node.name).strip("_")
+    if dir := request.config.getoption('--pdf-dir'):
+        pdf_dir: Path = (dir / dirname).absolute()
+        pdf_dir.mkdir(exist_ok=True, parents=True)
+        yield pdf_dir
+    else:
+        yield tmp_path_factory.mktemp(dirname)