#!/bin/bash
set -uxo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd /workspace
git config --global --add safe.directory /workspace
mkdir -p /logs/verifier
git checkout 220edcfd7a16552acbd604fe5892051e73fb30cb -- tests/test_gains.py tests/test_helpers.py || true
git apply --verbose --reject - <<'EOF_R2E_TEST_PATCH'
diff --git a/tests/test_gains.py b/tests/test_gains.py
index 0685a83..61db084 100644
--- a/tests/test_gains.py
+++ b/tests/test_gains.py
@@ -238,6 +238,89 @@ class TestGainsClass:
         # total equals the paid stamp exactly.
         assert total_stamp == Decimal("1.25")
 
+    def test_failed_sip_payment_not_received_nets_to_zero(self):
+        """A failed SIP (``Payment not received``) reverses both the
+        units and the stamp duty on the same date. Modelled on a real
+        CAMS DETAILED statement::
+
+            SIP Purchase - Instalment 1/7        2,999.85   1.365  2,198.255
+            *** Stamp Duty ***                        0.15
+            SIP Purchase151/Payment not received  (2,999.85) (1.365) 2,198.255
+            *** Stamp Duty ***                       (0.15)
+
+        Two guarantees:
+
+        - The reversal is classified ``REVERSAL`` (not ``REDEMPTION``),
+          so net ``purchase_units`` for the date is 0 → no buy, no sell,
+          and therefore **no phantom redemption** in the gains report.
+        - The matching ``(0.15)`` stamp reversal nets the date's stamp
+          duty to exactly 0, so **no stamp is ever claimed** for a
+          purchase that never settled (a failed payment is not a §48
+          transfer).
+        """
+        fund = Fund("Failed-SIP Fund", "FS", "INF000FS0001", "EQUITY")
+        dt = date(2025, 9, 26)
+        transactions = [
+            TransactionData(
+                date=dt,
+                description="SIP Purchase - Instalment 1/7 - via myCAMS Online",
+                amount=Decimal("2999.85"),
+                units=Decimal("1.365"),
+                nav=Decimal("2198.255"),
+                balance=Decimal("3.843"),
+                type=TransactionType.PURCHASE_SIP,
+                dividend_rate=None,
+            ),
+            TransactionData(
+                date=dt,
+                description="*** Stamp Duty ***",
+                amount=Decimal("0.15"),
+                units=None,
+                nav=None,
+                balance=None,
+                type=TransactionType.STAMP_DUTY_TAX,
+                dividend_rate=None,
+            ),
+            TransactionData(
+                date=dt,
+                description=(
+                    "SIP Purchase151/Payment not received from investor "
+                    "Banker Physical - Instalment No 1"
+                ),
+                amount=Decimal("-2999.85"),
+                units=Decimal("-1.365"),
+                nav=Decimal("2198.255"),
+                balance=Decimal("2.478"),
+                type=TransactionType.REVERSAL,
+                dividend_rate=None,
+            ),
+            TransactionData(
+                date=dt,
+                description="*** Stamp Duty ***",
+                amount=Decimal("-0.15"),
+                units=None,
+                nav=None,
+                balance=None,
+                type=TransactionType.STAMP_DUTY_TAX,
+                dividend_rate=None,
+            ),
+        ]
+        fifo = FIFOUnits(fund, transactions)
+
+        # Units and stamp both net to zero for the date.
+        merged = fifo._merged_transactions[dt]
+        assert merged.purchase_units == Decimal("0.000")
+        assert merged.sale_units == Decimal("0")
+        assert merged.stamp_duty == Decimal("0.00")
+
+        # No phantom redemption, and nothing left in the FIFO queue.
+        assert fifo.gains == []
+        assert fifo.balance == Decimal("0")
+
+        # No stamp duty claimed anywhere.
+        total_stamp = sum((ge.stamp_duty for ge in fifo.gains), Decimal("0"))
+        assert total_stamp == Decimal("0")
+
 
 def _ltcg_entry(fy, fund, purchase_date, sale_date, units="100.000"):
     """Build a minimal LTCG GainEntry (EQUITY, held > 1yr) for the
diff --git a/tests/test_helpers.py b/tests/test_helpers.py
index b0b51c8..d19bc66 100644
--- a/tests/test_helpers.py
+++ b/tests/test_helpers.py
@@ -53,6 +53,13 @@ class TestTransactionType:
             "Purchase SIPCheque Dishonoured - Instalment No 108",
             Decimal("-1"),
         ) == (TransactionType.REVERSAL, None)
+        # A failed-SIP "payment not received" row carries negative units
+        # but is a reversal of a provisional purchase, not a redemption.
+        assert get_transaction_type(
+            "SIP Purchase151/Payment not received from investor Banker "
+            "Physical - Instalment No 1",
+            Decimal("-1.365"),
+        ) == (TransactionType.REVERSAL, None)
 
     def test_dividends(self):
         assert get_transaction_type(

EOF_R2E_TEST_PATCH
R2E_APPLY_RC=$?
if [ "$R2E_APPLY_RC" -ne 0 ]; then
  echo "0.000000" > /logs/verifier/reward.txt
  printf '%s' '{"reward": 0.0, "resolved": false, "parse_status": "test_patch_apply_failed"}' > /logs/verifier/reward-details.json
  echo "R2E: test_patch failed to apply (rc=$R2E_APPLY_RC) — failing closed" >&2
  exit 0
fi
( python -m pytest -v tests/test_gains.py tests/test_helpers.py ) > /logs/verifier/test_output.log 2>&1
TEST_EXIT_CODE=$?
cat /logs/verifier/test_output.log
python3 "$SCRIPT_DIR/verifier.py" --log /logs/verifier/test_output.log --f2p "$SCRIPT_DIR/f2p.json" --p2p "$SCRIPT_DIR/p2p.json" --test-cmds 'python -m pytest -v tests/test_gains.py tests/test_helpers.py' --exit-code "$TEST_EXIT_CODE" --out-dir /logs/verifier || { [ "$TEST_EXIT_CODE" -eq 0 ] && echo "1.0" > /logs/verifier/reward.txt || echo "0.0" > /logs/verifier/reward.txt; }
git checkout 220edcfd7a16552acbd604fe5892051e73fb30cb -- tests/test_gains.py tests/test_helpers.py || true
exit 0