Refactor configuration handling and improve error management across services; normalize placeholder values for SMTP and Stripe configurations; enhance local storage fallback logic in StorageService; add tests for new behaviors and edge cases.

backend/tests/test_pdf_ai_service.py

@@ -0,0 +1,24 @@
+"""Service-level tests for PDF AI helpers."""
+import pytest
+
+from app.services.pdf_ai_service import PdfAiError, _extract_text_from_pdf
+
+
+def test_extract_text_from_pdf_rejects_password_protected_documents(monkeypatch):
+    """Password-protected PDFs should surface a specific actionable error."""
+
+    class FakeReader:
+        def __init__(self, input_path):
+            self.is_encrypted = True
+            self.pages = []
+
+        def decrypt(self, password):
+            return 0
+
+    monkeypatch.setattr("PyPDF2.PdfReader", FakeReader)
+
+    with pytest.raises(PdfAiError) as exc:
+        _extract_text_from_pdf("/tmp/protected.pdf")
+
+    assert exc.value.error_code == "PDF_ENCRYPTED"
+    assert "unlock" in exc.value.user_message.lower()