Update functional RBF test to check replaceable flag

Author: dexX7

test/functional/feature_rbf.py

@@ -427,6 +427,9 @@ def test_opt_in(self):
         tx1a_hex = txToHex(tx1a)
         tx1a_txid = self.nodes[0].sendrawtransaction(tx1a_hex, True)
 
+        # This transaction isn't shown as replaceable
+        assert_equal(self.nodes[0].getmempoolentry(tx1a_txid)['bip125-replaceable'], False)
+
         # Shouldn't be able to double-spend
         tx1b = CTransaction()
         tx1b.vin = [CTxIn(tx0_outpoint, nSequence=0)]
@@ -467,7 +470,10 @@ def test_opt_in(self):
         tx3a.vout = [CTxOut(int(0.9*COIN), CScript([b'c'])), CTxOut(int(0.9*COIN), CScript([b'd']))]
         tx3a_hex = txToHex(tx3a)
 
-        self.nodes[0].sendrawtransaction(tx3a_hex, True)
+        tx3a_txid = self.nodes[0].sendrawtransaction(tx3a_hex, True)
+
+        # This transaction is shown as replaceable
+        assert_equal(self.nodes[0].getmempoolentry(tx3a_txid)['bip125-replaceable'], True)
 
         tx3b = CTransaction()
         tx3b.vin = [CTxIn(COutPoint(tx1a_txid, 0), nSequence=0)]