feat(sp41): SVC-level 835 reparser with member_id at SVC scope

backend/tests/test_rebill_parse_835_svc.py

@@ -0,0 +1,28 @@
+"""835 SVC-level parser with member_id at SVC scope."""
+from pathlib import Path
+from decimal import Decimal
+from cyclone.rebill.parse_835_svc import parse_835_svc
+
+FIX = Path(__file__).parent / "fixtures" / "835_sample_svc_with_member.txt"
+
+def test_parse_835_svc_extracts_member_id():
+    """NM1*QC NM109 at the CLP scope must propagate to every SVC row."""
+    rows = list(parse_835_svc(FIX))
+    assert len(rows) >= 1
+    for r in rows:
+        assert r.member_id == "J813715"
+        assert r.procedure  # non-empty
+        assert r.svc_date   # non-empty
+        assert r.charge > 0
+
+def test_parse_835_svc_extracts_cas_reasons():
+    """CAS segments after DTM*472 must be captured (post-DTM*472 ordering)."""
+    rows = list(parse_835_svc(FIX))
+    # at least one row should have an OA-18 reason
+    assert any("OA-18" in r.cas_reasons for r in rows)
+
+def test_parse_835_svc_picks_up_status_22_reversals():
+    """Status 22 (reversal of previous payment) must be preserved."""
+    rows = list(parse_835_svc(FIX))
+    statuses = {r.status for r in rows}
+    assert statuses & {"1", "4", "22"}  # at least one of each present