Copy over the code and tests, to see if this even works

src/documents/tests/date_parsing/conftest.py

@@ -0,0 +1,82 @@
+import datetime
+from collections.abc import Generator
+from typing import Any
+
+import pytest
+import pytest_django
+
+from documents.plugins.date_parsing import _discover_parser_class
+from documents.plugins.date_parsing.base import DateParserConfig
+from documents.plugins.date_parsing.regex_parser import RegexDateParserPlugin
+
+
+@pytest.fixture
+def base_config() -> DateParserConfig:
+    """Basic configuration for date parser testing."""
+    return DateParserConfig(
+        languages=["en"],
+        timezone_str="UTC",
+        ignore_dates=set(),
+        reference_time=datetime.datetime(
+            2024,
+            1,
+            15,
+            12,
+            0,
+            0,
+            tzinfo=datetime.timezone.utc,
+        ),
+        filename_date_order="YMD",
+        content_date_order="DMY",
+    )
+
+
+@pytest.fixture
+def config_with_ignore_dates() -> DateParserConfig:
+    """Configuration with dates to ignore."""
+    return DateParserConfig(
+        languages=["en", "de"],
+        timezone_str="America/New_York",
+        ignore_dates={datetime.date(2024, 1, 1), datetime.date(2024, 12, 25)},
+        reference_time=datetime.datetime(
+            2024,
+            1,
+            15,
+            12,
+            0,
+            0,
+            tzinfo=datetime.timezone.utc,
+        ),
+        filename_date_order="DMY",
+        content_date_order="MDY",
+    )
+
+
+@pytest.fixture
+def regex_parser(base_config: DateParserConfig) -> RegexDateParserPlugin:
+    """Instance of RegexDateParser with base config."""
+    return RegexDateParserPlugin(base_config)
+
+
+@pytest.fixture
+def clear_lru_cache() -> Generator[None, None, None]:
+    """
+    Ensure the LRU cache for _discover_parser_class is cleared
+    before and after any test that depends on it.
+    """
+    _discover_parser_class.cache_clear()
+    yield
+    _discover_parser_class.cache_clear()
+
+
+@pytest.fixture
+def mock_date_parser_settings(settings: pytest_django.fixtures.SettingsWrapper) -> Any:
+    """
+    Override Django settings for the duration of date parser tests.
+    """
+    settings.DATE_PARSER_LANGUAGES = ["en", "de"]
+    settings.TIME_ZONE = "UTC"
+    settings.IGNORE_DATES = [datetime.date(1900, 1, 1)]
+    settings.FILENAME_DATE_ORDER = "YMD"
+    settings.DATE_ORDER = "DMY"
+    return settings