feat(sp41): pipeline B — NOT_IN_835 → fresh 837Ps by (member, ISO-week)

backend/tests/test_rebill_pipeline_b.py

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+"""Pipeline B: NOT_IN_835 visits → fresh 837Ps, batched by (member, ISO-week)."""
+from datetime import date
+from decimal import Decimal
+from cyclone.rebill.pipeline_b import build_pipeline_b_batches
+from cyclone.rebill.reconcile import VisitRow
+
+
+def _v(date_, member, proc, amt):
+    return VisitRow(date=date_, member_id=member, procedure=proc, billed=Decimal(amt))
+
+
+def test_batches_split_by_member_and_iso_week():
+    visits = [
+        _v(date(2026, 6, 23), "J813715", "T1019", "2.32"),
+        _v(date(2026, 6, 25), "J813715", "T1019", "2.32"),  # same week
+        _v(date(2026, 6, 23), "OTHER",    "T1019", "2.32"),  # different member
+        _v(date(2026, 6, 30), "J813715", "T1019", "2.32"),  # different week
+    ]
+    out = build_pipeline_b_batches(visits, as_of=date(2026, 7, 7), override=False)
+    assert len(out) == 3
+    sizes = sorted(len(b.visits) for b in out)
+    assert sizes == [1, 1, 2]
+
+
+def test_timely_filing_excludes_old_visits():
+    visits = [
+        _v(date(2026, 1, 1), "OLD", "T1019", "2.32"),  # 187 days old
+        _v(date(2026, 6, 27), "NEW", "T1019", "2.32"), # 10 days old
+    ]
+    out = build_pipeline_b_batches(visits, as_of=date(2026, 7, 7), override=False)
+    members = {b.member_id for b in out}
+    assert "OLD" not in members
+    assert "NEW" in members
+
+
+def test_override_relaxes_timely_filing():
+    visits = [_v(date(2026, 1, 1), "OLD", "T1019", "2.32")]
+    out_default = build_pipeline_b_batches(visits, as_of=date(2026, 7, 7), override=False)
+    out_overridden = build_pipeline_b_batches(visits, as_of=date(2026, 7, 7), override=True)
+    assert out_default == []
+    assert len(out_overridden) == 1