add tests

tests/integration/test_wallet_melt_restart.py

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+"""Restart reconciliation for ambiguous melts, against a real cashu wallet DB.
+
+The ambiguous-melt path in ``execute_bolt11_payment`` re-reserves proofs with
+``set_reserved_for_melt(..., quote_id=...)`` after cashu's ``melt()`` clears
+both the reservation and the ``melt_id`` on a transport error. These tests
+prove, on cashu's actual sqlite store rather than mocks, that the recovery
+survives a process restart: a fresh wallet instance on the same database can
+still find the proofs by ``melt_id`` — the lookup ``get_melt_quote()`` uses to
+invalidate them on "paid" or release them on "unpaid".
+"""
+
+from pathlib import Path
+
+import pytest
+from cashu.core.base import Proof
+from cashu.wallet import crud
+from cashu.wallet.wallet import Wallet
+
+pytestmark = pytest.mark.asyncio
+
+QUOTE_ID = "quote-restart-1"
+
+
+def _proof(secret: str, amount: int = 64) -> Proof:
+    return Proof(
+        id="009a1f293253e41e",
+        amount=amount,
+        secret=secret,
+        C="02bc9097997d81afb2cc7346b5e4345a9346bd2a506eb7958598a72f0cf85163ea",
+    )
+
+
+async def _wallet(db_dir: Path) -> Wallet:
+    # with_db builds the instance and runs migrations locally; nothing here
+    # talks to a mint.
+    return await Wallet.with_db("https://mint.test", str(db_dir))
+
+
+async def _seed_ambiguous_melt(wallet: Wallet) -> list[Proof]:
+    """Reproduce the exact sequence of an ambiguous melt failure.
+
+    1. Proofs exist and are selected for a melt.
+    2. cashu's melt() reserves them with the quote id, then hits a transport
+       error and rolls that back — reservation gone, melt_id gone.
+    3. Our recovery in execute_bolt11_payment re-reserves with the quote id.
+    """
+    proofs = [_proof("secret-a"), _proof("secret-b", amount=32)]
+    for proof in proofs:
+        await crud.store_proof(proof, db=wallet.db)
+
+    await wallet.set_reserved_for_melt(proofs, reserved=True, quote_id=QUOTE_ID)
+    # cashu's `except` block in melt():
+    await wallet.set_reserved_for_melt(proofs, reserved=False, quote_id=None)
+    # our recovery:
+    await wallet.set_reserved_for_melt(proofs, reserved=True, quote_id=QUOTE_ID)
+    return proofs
+
+
+async def test_melt_recovery_is_findable_by_quote_after_restart(
+    tmp_path: Path,
+) -> None:
+    wallet = await _wallet(tmp_path)
+    await _seed_ambiguous_melt(wallet)
+
+    # "Restart": a brand-new wallet on the same database file, as after a
+    # process crash between the melt and any reconciliation.
+    restarted = await _wallet(tmp_path)
+    found = await crud.get_proofs(db=restarted.db, melt_id=QUOTE_ID)
+
+    # This is get_melt_quote()'s own lookup. If it comes back empty, a "paid"
+    # answer can never invalidate these proofs and an "unpaid" answer can
+    # never release them — the strand the send-style re-reserve caused.
+    assert sorted(p.secret for p in found) == ["secret-a", "secret-b"]
+    assert all(p.reserved for p in found)
+    assert all(p.melt_id == QUOTE_ID for p in found)
+
+
+async def test_send_style_reservation_would_not_be_reconcilable(
+    tmp_path: Path,
+) -> None:
+    """The defect the fix removed, demonstrated on the real store."""
+    wallet = await _wallet(tmp_path)
+    proofs = [_proof("secret-send")]
+    for proof in proofs:
+        await crud.store_proof(proof, db=wallet.db)
+
+    await wallet.set_reserved_for_melt(proofs, reserved=True, quote_id=QUOTE_ID)
+    await wallet.set_reserved_for_melt(proofs, reserved=False, quote_id=None)
+    # The old recovery: reserve as a send, no quote association.
+    await wallet.set_reserved_for_send(proofs, reserved=True)
+
+    restarted = await _wallet(tmp_path)
+    found = await crud.get_proofs(db=restarted.db, melt_id=QUOTE_ID)
+    assert found == []  # reconciliation would never see these proofs
+
+
+async def test_unpaid_reconciliation_releases_recovered_proofs_after_restart(
+    tmp_path: Path,
+) -> None:
+    """The full recovery arc: crash, restart, mint says unpaid, funds usable."""
+    wallet = await _wallet(tmp_path)
+    await _seed_ambiguous_melt(wallet)
+
+    restarted = await _wallet(tmp_path)
+    found = await crud.get_proofs(db=restarted.db, melt_id=QUOTE_ID)
+    assert len(found) == 2
+
+    # What get_melt_quote() does on an "unpaid" answer.
+    await restarted.set_reserved_for_melt(found, reserved=False, quote_id=None)
+
+    released = await crud.get_proofs(db=restarted.db, melt_id=QUOTE_ID)
+    assert released == []
+    all_proofs = await crud.get_proofs(db=restarted.db)
+    assert len(all_proofs) == 2
+    assert all(not p.reserved for p in all_proofs)  # spendable again