diff --git a/test/functional/data/invalid_txs.py b/test/functional/data/invalid_txs.py
--- a/test/functional/data/invalid_txs.py
+++ b/test/functional/data/invalid_txs.py
@@ -21,7 +21,13 @@
 """
 import abc
 
-from test_framework.messages import CTransaction, CTxIn, CTxOut, COutPoint
+from test_framework.messages import (
+    COutPoint,
+    CTransaction,
+    CTxIn,
+    CTxOut,
+    MAX_MONEY,
+)
 from test_framework import script as sc
 from test_framework.blocktools import create_tx_with_script
 from test_framework.txtools import pad_tx
@@ -176,7 +182,7 @@
             self.spend_tx, 0, script_pub_key=basic_p2sh, amount=(self.spend_avail + 1))
 
 
-class SpendNegative(BadTxTemplate):
+class CreateNegative(BadTxTemplate):
     reject_reason = 'bad-txns-vout-negative'
     expect_disconnect = True
 
@@ -184,6 +190,25 @@
         return create_tx_with_script(self.spend_tx, 0, amount=-1)
 
 
+class CreateTooLarge(BadTxTemplate):
+    reject_reason = 'bad-txns-vout-toolarge'
+    expect_disconnect = True
+
+    def get_tx(self):
+        return create_tx_with_script(self.spend_tx, 0, amount=MAX_MONEY + 1)
+
+
+class CreateSumTooLarge(BadTxTemplate):
+    reject_reason = 'bad-txns-txouttotal-toolarge'
+    expect_disconnect = True
+
+    def get_tx(self):
+        tx = create_tx_with_script(self.spend_tx, 0, amount=MAX_MONEY)
+        tx.vout = [tx.vout[0]] * 2
+        tx.calc_sha256()
+        return tx
+
+
 class InvalidOPIFConstruction(BadTxTemplate):
     reject_reason = "mandatory-script-verify-flag-failed (Invalid OP_IF construction)"
     expect_disconnect = True
diff --git a/test/functional/mempool_accept.py b/test/functional/mempool_accept.py
--- a/test/functional/mempool_accept.py
+++ b/test/functional/mempool_accept.py
@@ -14,6 +14,7 @@
     FromHex,
     MAX_BLOCK_BASE_SIZE,
     ToHex,
+    MAX_MONEY,
 )
 from test_framework.script import (
     hash160,
@@ -238,7 +239,7 @@
         # (see CVE-2010-5139).
         self.log.info('A transaction with too large output value')
         tx = FromHex(CTransaction(), raw_tx_reference)
-        tx.vout[0].nValue = 21000000 * COIN + 1
+        tx.vout[0].nValue = MAX_MONEY + 1
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(
             ), 'allowed': False, 'reject-reason': 'bad-txns-vout-toolarge'}],
@@ -248,7 +249,7 @@
         self.log.info('A transaction with too large sum of output values')
         tx = FromHex(CTransaction(), raw_tx_reference)
         tx.vout = [tx.vout[0]] * 2
-        tx.vout[0].nValue = 21000000 * COIN
+        tx.vout[0].nValue = MAX_MONEY
         self.check_mempool_result(
             result_expected=[{'txid': tx.rehash(
             ), 'allowed': False, 'reject-reason': 'bad-txns-txouttotal-toolarge'}],
diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -44,6 +44,7 @@
 
 # 1 BCH in satoshis
 COIN = 100000000
+MAX_MONEY = 21000000 * COIN
 
 NODE_NETWORK = (1 << 0)
 NODE_GETUTXO = (1 << 1)