refactor(tests): add shared CLI test helpers

Adds shared test helpers for CLI script loading and scoped core.database stubs, then converts a low-conflict pilot set of CLI tests. Part of #2523.

tests/test_docs_cli_content_length.py

@@ -1,30 +1,10 @@
-import importlib.machinery
-import importlib.util
-import sys
-import types
-from pathlib import Path
-from unittest.mock import MagicMock
-
-
-ROOT = Path(__file__).resolve().parents[1]
-
-
-def _load_cli(monkeypatch):
-    db = types.ModuleType("core.database")
-    db.SessionLocal = MagicMock()
-    db.Document = MagicMock()
-    db.DocumentVersion = MagicMock()
-    monkeypatch.setitem(sys.modules, "core.database", db)
-    path = ROOT / "scripts" / "odysseus-docs"
-    loader = importlib.machinery.SourceFileLoader("odysseus_docs_cli", str(path))
-    spec = importlib.util.spec_from_loader(loader.name, loader)
-    module = importlib.util.module_from_spec(spec)
-    loader.exec_module(module)
-    return module
+from tests.helpers.cli_loader import load_script
+from tests.helpers.db_stubs import make_core_db_stub
 
 
 def test_text_len_ignores_non_string_values(monkeypatch):
-    cli = _load_cli(monkeypatch)
+    make_core_db_stub(monkeypatch, models=["Document", "DocumentVersion"])
+    cli = load_script("odysseus-docs")
 
     assert cli._text_len("hello") == 5
     assert cli._text_len(None) == 0