Remove replay protection tests from test_transaction_signing

Removed tests for replay protection and nonce handling.

Author: kpj2006

tests/test_transaction_signing_karun.py

@@ -140,59 +140,5 @@ def test_unsigned_transaction_fails_verification(alice, bob):
     assert not tx.verify(), "An unsigned transaction must not verify."
 
 
-# ------------------------------------------------------------------
-# 4. Replay protection
-# ------------------------------------------------------------------
-
-def test_replay_attack_same_nonce_rejected(alice, bob, funded_state):
-    """Replaying the same transaction must be rejected the second time."""
-    alice_sk, alice_pk = alice
-    _, bob_pk = bob
-
-    tx = Transaction(alice_pk, bob_pk, 10, nonce=0)
-    tx.sign(alice_sk)
-
-    assert funded_state.apply_transaction(tx), "First submission must succeed."
-    assert not funded_state.apply_transaction(tx), "Replayed transaction must be rejected."
-    # Ensure the rejected replay did not mutate the ledger
-    assert funded_state.get_account(alice_pk)["balance"] == 90, \
-        "Alice's balance must not change after a rejected replay."
-    assert funded_state.get_account(alice_pk)["nonce"] == 1, \
-        "Alice's nonce must not advance after a rejected replay."
-
-
-def test_out_of_order_nonce_rejected(alice, bob, funded_state):
-    """A transaction with a skipped nonce must be rejected."""
-    alice_sk, alice_pk = alice
-    _, bob_pk = bob
-
-    tx = Transaction(alice_pk, bob_pk, 10, nonce=5)
-    tx.sign(alice_sk)
-
-    assert not funded_state.apply_transaction(tx), "A transaction with a skipped nonce must be rejected."
-    # Ensure the rejected transaction did not mutate the ledger
-    assert funded_state.get_account(alice_pk)["balance"] == 100, \
-        "Alice's balance must remain unchanged after a rejected transaction."
-    assert funded_state.get_account(alice_pk)["nonce"] == 0, \
-        "Alice's nonce must remain unchanged after a rejected transaction."
-
-
-def test_sequential_nonces_accepted(alice, bob, funded_state):
-    """Two transactions with consecutive nonces must both succeed."""
-    alice_sk, alice_pk = alice
-    _, bob_pk = bob
-
-    tx0 = Transaction(alice_pk, bob_pk, 10, nonce=0)
-    tx0.sign(alice_sk)
-    assert funded_state.apply_transaction(tx0)
-
-    tx1 = Transaction(alice_pk, bob_pk, 10, nonce=1)
-    tx1.sign(alice_sk)
-    assert funded_state.apply_transaction(tx1)
 
-    assert funded_state.get_account(alice_pk)["nonce"] == 2, \
-        "Alice's nonce should advance to 2 after two accepted transactions."
-    assert funded_state.get_account(alice_pk)["balance"] == 80, \
-        "Alice's balance should be 80 after two 10-coin transfers."
-    assert funded_state.get_account(bob_pk)["balance"] == 20, \
         "Bob's balance should be 20 after receiving two transfers."