fix: asserts were wrong

ape_safe/client/mock.py

@@ -96,11 +96,11 @@ def post_transaction(
         # NOTE: More strict than Safe API check that silently ignores if no signatures are valid or
         #       from delegates, but should help us to get correct logic for mock testing purposes
         # NOTE: Using `assert` because this client is only meant for mock testing purposes
-        assert len(safe_tx_data.confirmations) > 0
-        assert all(
+        assert len(safe_tx_data.confirmations) == 0, "Must be a zero-conf txn"
+        assert any(
             self.delegator_for_delegate(signer) in owners
             for signer in filter(lambda signer: signer not in owners, signatures)
-        )
+        ), "At least one signature must be from a valid owner of the safe"
 
         tx_id = cast(SafeTxID, HexBytes(safe_tx_data.safe_tx_hash).hex())
         self.transactions[tx_id] = safe_tx_data