cicnet/erc20-demurrage-token
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lash/simple-contract
erc20-demurrage-token/python/tests/test_burn.py

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# standard imports
import os
import unittest
import json
import logging
import datetime
# external imports
from chainlib.eth.constant import ZERO_ADDRESS
from chainlib.eth.nonce import RPCNonceOracle
from chainlib.eth.tx import receipt
from chainlib.eth.block import (
block_latest,
block_by_number,
)
# local imports
from erc20_demurrage_token import DemurrageToken
# test imports
from erc20_demurrage_token.unittest.base import TestDemurrage
logging.basicConfig(level=logging.INFO)
logg = logging.getLogger()
testdir = os.path.dirname(__file__)
TAX_LEVEL = 2
class TestBurn(TestDemurrage):
def setUp(self):
super(TestBurn, self).setUp()
def deploy(self, tax_level=None):
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
self.mode = os.environ.get('ERC20_DEMURRAGE_TOKEN_TEST_MODE')
if self.mode == None:
self.mode = 'MultiNocap'
logg.debug('executing test setup default mode {}'.format(self.mode))
if tax_level != None:
self.deployer.settings.demurrage_level = tax_level * (10 ** 32)
self.deployer.settings.sink_address = self.accounts[9]
self.deployer.sink_address = self.accounts[9]
super(TestBurn, self).deploy(c, self.mode)
logg.info('deployed with mode {}'.format(self.mode))
# Burn tokens and immediately check balances and supply
def test_burn_basic(self):
self.deploy()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 1000000)
r = self.rpc.do(o)
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.burn(self.address, self.accounts[1], 600000)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 0)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.add_minter(self.address, self.accounts[0], self.accounts[1])
r = self.rpc.do(o)
nonce_oracle = RPCNonceOracle(self.accounts[1], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.burn(self.address, self.accounts[1], 600000)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 400000)
o = c.total_burned(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
burned = c.parse_total_burned(r)
self.assertEqual(burned, 600000)
# burn tokens and check sink balance and supply after first redistribution period
def test_burned_redistribution(self):
self.deploy()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000000)
r = self.rpc.do(o)
(tx_hash, o) = c.burn(self.address, self.accounts[0], 500000000)
r = self.rpc.do(o)
(tx_hash, o) = c.transfer(self.address, self.accounts[0], self.sink_address, 500000000)
r = self.rpc.do(o)
self.backend.time_travel(self.start_time + self.period_seconds)
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assertEqual(bal, 416873881) # 9 periods demurrage
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assert_within_lower(bal, 500000000, 0.0025)
self.backend.time_travel(self.start_time + (self.period_seconds * 2))
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
# if we don't burn anything more it should be the same
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assert_within_lower(bal, 500000000, 0.0025)
# burn tokens and check sink and taxed balance and supply after first redistribution period
def test_burned_other_redistribution(self):
self.deploy()
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[0], 1000000000)
r = self.rpc.do(o)
(tx_hash, o) = c.burn(self.address, self.accounts[0], 500000000)
r = self.rpc.do(o)
(tx_hash, o) = c.transfer(self.address, self.accounts[0], self.accounts[1], 500000000)
r = self.rpc.do(o)
self.backend.time_travel(self.start_time + self.period_seconds)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assertEqual(bal, 416873881) # 9 periods demurrage
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bal = c.parse_balance(r)
self.assertEqual(bal, 408536403) # 9 periods demurrage
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
sink_bal = c.parse_balance(r)
self.assert_within_lower(sink_bal, 500000000 - 408536403, 0.09) # TODO is this ok variance, 1.0 is ppm?
self.backend.time_travel(self.start_time + (self.period_seconds * 2))
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.assertEqual(new_supply, 500000000)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
next_bal = c.parse_balance(r)
self.assertEqual(next_bal, 333803985) # 9 periods demurrage
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
prev_sink_bal = sink_bal
bal = prev_sink_bal + (bal - next_bal)
sink_bal = c.parse_balance(r)
self.assert_within_lower(sink_bal, bal, 0.09) # TODO is this ok variance, 1.0 is ppm?
# verify expected results of balance and supply after multiple redistribution periods
def test_burn_accumulate(self):
self.deploy(tax_level=2/1000)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.add_minter(self.address, self.accounts[0], self.sink_address)
self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.sink_address, self.default_supply)
r = self.rpc.do(o)
balance_share = int(self.default_supply / 2)
nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
(tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], balance_share)
r = self.rpc.do(o)
new_supply = None
burn_rate = 1000
sink_bal = None
bob_bal = None
bob_refund = None
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
prev_bob_bal = bob_bal
iterations = 100
for i in range(1, iterations + 1):
nonce_oracle = RPCNonceOracle(self.sink_address, self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
if bob_refund != None:
(tx_hash, o) = c.transfer(self.address, self.sink_address, self.accounts[1], bob_refund)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
(tx_hash, o) = c.burn(self.address, self.sink_address, burn_rate)
r = self.rpc.do(o)
o = receipt(tx_hash)
r = self.rpc.do(o)
self.assertEqual(r['status'], 1)
nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
o = c.total_supply(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
new_supply = c.parse_total_supply(r)
self.backend.time_travel(self.start_time + (self.period_seconds * i))
(tx_hash, o) = c.change_period(self.address, self.accounts[0])
self.rpc.do(o)
o = c.balance(self.address, self.accounts[1], sender_address=self.accounts[0])
r = self.rpc.do(o)
bob_bal = c.parse_balance(r)
bob_refund = prev_bob_bal - bob_bal
o = c.balance(self.address, self.sink_address, sender_address=self.accounts[0])
r = self.rpc.do(o)
burner_bal = c.parse_balance(r)
sum_supply = bob_bal + burner_bal
o = c.total_burned(self.address, sender_address=self.accounts[0])
r = self.rpc.do(o)
total_burned = c.parse_balance(r)
o = c.to_base_amount(self.address, total_burned, sender_address=self.accounts[0])
r = self.rpc.do(o)
total_burned_base = c.parse_balance(r)
expected_supply = self.default_supply - (burn_rate * i)
logg.info('checking burn round {} balance burner {} bob {} supply {} expected {} summed {} burned {} base {}'.format(i, burner_bal, bob_bal, new_supply, expected_supply, sum_supply, total_burned, total_burned_base))
self.assertEqual(new_supply, expected_supply)
sum_supply = burner_bal + bob_bal
logg.debug('balances sink {} bob {} total {} supply real {} original {}'.format(sink_bal, bob_bal, sum_supply, new_supply, self.default_supply))
self.assert_within_lower(sum_supply, new_supply, 0.00001)
self.assert_within_greater(burner_bal, balance_share - total_burned, 0.1)
bob_delta = self.default_supply * ((2 / 1000000) / 1000)
self.assert_within_lower(bob_bal, balance_share - bob_delta, 0.1)
self.assertEqual(total_burned, iterations * burn_rate)
if __name__ == '__main__':
unittest.main()
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