Asserts that the tx version number is a signed 32-bit integer.

test/functional/rpc_rawtransaction.py

@@ -14,13 +14,10 @@ Test the following RPCs:
 
 from collections import OrderedDict
 from io import BytesIO
+from test_framework.messages import CTransaction, ToHex
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.messages import (
-    CTransaction,
-)
 from test_framework.util import *
 
-
 class multidict(dict):
     """Dictionary that allows duplicate keys.
 
@@ -363,5 +360,23 @@ class RawTransactionsTest(BitcoinTestFramework):
         decrawtx= self.nodes[0].decoderawtransaction(rawtx)
         assert_equal(decrawtx['vin'][0]['sequence'], 4294967294)
 
+        ####################################
+        # TRANSACTION VERSION NUMBER TESTS #
+        ####################################
+
+        # Test the minimum transaction version number that fits in a signed 32-bit integer.
+        tx = CTransaction()
+        tx.nVersion = -0x80000000
+        rawtx = ToHex(tx)
+        decrawtx = self.nodes[0].decoderawtransaction(rawtx)
+        assert_equal(decrawtx['version'], -0x80000000)
+
+        # Test the maximum transaction version number that fits in a signed 32-bit integer.
+        tx = CTransaction()
+        tx.nVersion = 0x7fffffff
+        rawtx = ToHex(tx)
+        decrawtx = self.nodes[0].decoderawtransaction(rawtx)
+        assert_equal(decrawtx['version'], 0x7fffffff)
+
 if __name__ == '__main__':
     RawTransactionsTest().main()