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76 lines
3.1 KiB
Python
Executable File
76 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (c) 2017-present The Bitcoin Core developers
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# Distributed under the MIT software license, see the accompanying
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# file COPYING or http://www.opensource.org/licenses/mit-license.php.
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"""Test wallet fallbackfee."""
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from decimal import Decimal
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from test_framework.blocktools import COINBASE_MATURITY
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from test_framework.test_framework import BitcoinTestFramework
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from test_framework.util import assert_equal, assert_raises_rpc_error
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HIGH_TX_FEE_PER_KB = Decimal('0.01')
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class WalletFallbackFeeTest(BitcoinTestFramework):
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def set_test_params(self):
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self.num_nodes = 1
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self.setup_clean_chain = True
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def skip_test_if_missing_module(self):
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self.skip_if_no_wallet()
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def sending_succeeds(self, node):
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# Check that fallback fee is being used as a test-of-the-test.
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assert_equal(
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node.sendtoaddress(node.getnewaddress(), 1, verbose=True)['fee_reason'],
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"Fallback fee"
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)
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node.fundrawtransaction(node.createrawtransaction([], {node.getnewaddress(): 1}))
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assert_equal(
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node.sendmany("", {node.getnewaddress(): 1}, verbose=True)["fee_reason"],
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"Fallback fee"
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)
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def sending_fails(self, node):
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assert_raises_rpc_error(-6, "Fee estimation failed", lambda: node.sendtoaddress(node.getnewaddress(), 1))
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assert_raises_rpc_error(-4, "Fee estimation failed", lambda: node.fundrawtransaction(node.createrawtransaction([], {node.getnewaddress(): 1})))
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assert_raises_rpc_error(-6, "Fee estimation failed", lambda: node.sendmany("", {node.getnewaddress(): 1}))
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def run_test(self):
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node = self.nodes[0]
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self.generate(node, COINBASE_MATURITY + 1)
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# By default, the test framework sets a fallback fee for nodes,
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# in order to test default behavior, comment this line out.
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node.replace_in_config([("fallbackfee=", "#fallbackfee=")])
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self.restart_node(0)
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# Sending a transaction with no -fallbackfee setting fails, since the
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# default value is 0.
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self.sending_fails(node)
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# Sending a tx with explicitly disabled fallback fee fails.
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self.restart_node(0, extra_args=["-fallbackfee=0"])
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self.sending_fails(node)
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# Sending a transaction with a fallback fee set succeeds. Use the
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# largest fallbackfee value that doesn't trigger a warning.
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self.restart_node(0, extra_args=[f"-fallbackfee={HIGH_TX_FEE_PER_KB}"])
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self.sending_succeeds(node)
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self.stop_node(0, expected_stderr='')
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# Starting a node with a large fallback fee set...
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excessive_fallback = HIGH_TX_FEE_PER_KB + Decimal('0.00000001')
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self.start_node(0, extra_args=[f"-fallbackfee={excessive_fallback}"])
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# ...works...
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self.sending_succeeds(node)
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# ...but results in a warning message.
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expected_error = "Warning: -fallbackfee is set very high! This is the transaction fee you may pay when fee estimates are not available."
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self.stop_node(0, expected_stderr=expected_error)
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if __name__ == '__main__':
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WalletFallbackFeeTest(__file__).main()
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