Allow zero-fee fundrawtxn and walletcreatefundedpsbt calls

A check to raise an error on zero-fee txns was mistakenly extended in commit
a0d4957 from the bumpfee and send{toaddress, many} RPCs to also include
fundrawtransaction and walletcreatefundedpsbt.

This commit overrides zero fee rate checking for these two RPCs, not only for
the feeRate (BTC/kvB) arg to return to previous behavior, but also for the new
fee_rate (sat/vB) arg.

1 files changed, 7 insertions, 1 deletions

diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
index 5da71c85f9..685e805877 100755
--- a/test/functional/wallet_send.py
+++ b/test/functional/wallet_send.py
@@ -303,10 +303,16 @@ class WalletSendTest(BitcoinTestFramework):
                 self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=v, estimate_mode=mode,
                     expect_error=(-3, "Expected type number for conf_target, got {}".format(k)))
 
-        # Test setting explicit fee rate just below the minimum.
+        # Test setting explicit fee rate just below the minimum and at zero.
         self.log.info("Explicit fee rate raises RPC error 'fee rate too low' if fee_rate of 0.99999999 is passed")
         self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=0.99999999,
             expect_error=(-4, "Fee rate (0.999 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
+        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=0.99999999,
+            expect_error=(-4, "Fee rate (0.999 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
+        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=0,
+            expect_error=(-4, "Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
+        self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=0,
+            expect_error=(-4, "Fee rate (0.000 sat/vB) is lower than the minimum fee rate setting (1.000 sat/vB)"))
 
         # TODO: Return hex if fee rate is below -maxmempool
         # res = self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=0.1, estimate_mode="sat/b", add_to_wallet=False)