Update rpc_psbt.py

Author: ComputerCraftr

test/functional/rpc_psbt.py

@@ -216,7 +216,7 @@ def run_test(self):
         dest_arg = [{self.nodes[0].getnewaddress(): 1}]
         min_tx_weight = 0
         assert_raises_rpc_error(-4, f"Maximum transaction weight must be between {min_tx_weight} and {MAX_STANDARD_TX_WEIGHT}", self.nodes[0].walletcreatefundedpsbt, [], dest_arg, 0, {"max_tx_weight": -1})
-        assert_raises_rpc_error(-4, f"Maximum transaction weight must be between {min_tx_weight} and {MAX_STANDARD_TX_WEIGHT}", self.nodes[0].walletcreatefundedpsbt, [], dest_arg, 0, {"max_tx_weight": 0})
+        assert_raises_rpc_error(-4, f"Maximum transaction weight must be between {min_tx_weight} and {MAX_STANDARD_TX_WEIGHT}", self.nodes[0].walletcreatefundedpsbt, [], dest_arg, 0, {"max_tx_weight": min_tx_weight - 1})
         assert_raises_rpc_error(-4, f"Maximum transaction weight must be between {min_tx_weight} and {MAX_STANDARD_TX_WEIGHT}", self.nodes[0].walletcreatefundedpsbt, [], dest_arg, 0, {"max_tx_weight": MAX_STANDARD_TX_WEIGHT + 1})
 
         # Base transaction vsize: version (4) + locktime (4) + input count (1) + witness overhead (1) = 10 vbytes
@@ -225,9 +225,6 @@ def run_test(self):
         p2wpkh_output_vsize = 31
         # 1 vbyte for output count
         output_count = 1
-        tx_weight_without_inputs = (base_tx_vsize + output_count + p2wpkh_output_vsize) * WITNESS_SCALE_FACTOR
-        # min_tx_weight is greater than transaction weight without inputs
-        assert_greater_than(min_tx_weight, tx_weight_without_inputs)
 
         # In order to test for when the passed max weight is less than the transaction weight without inputs
         # Define destination with two outputs.