add benchmark for testing

tests/test_mint_operations.py

@@ -1,3 +1,5 @@
+import time
+
 import pytest
 import pytest_asyncio
 
@@ -69,3 +71,18 @@ async def test_check_proof_state(wallet1: Wallet, ledger: Ledger):
     spendable, pending = await ledger.check_proof_state(proofs=send_proofs)
     assert sum(spendable) == len(send_proofs)
     assert sum(pending) == 0
+
+
+@pytest.mark.asyncio
+async def test_benchmark_check_proof_spendable(wallet1: Wallet, ledger: Ledger):
+    invoice = await wallet1.request_mint(1000)
+    pay_if_regtest(invoice.bolt11)
+    await wallet1.mint(1000, split=[1] * 1000, id=invoice.id)
+
+    time_begin = time.time()
+    spendable = await ledger._check_proofs_spendable(wallet1.proofs)
+    time_end = time.time()
+    time_elapsed = time_end - time_begin
+    print(f"Time elapsed: {time_elapsed}")
+    assert sum(spendable) == len(wallet1.proofs)
+    assert time_elapsed < 0.5