erc20-demurrage-token/python/tests/test_burn.py

# 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 TestDemurrageDefault

logging.basicConfig(level=logging.DEBUG)
logg = logging.getLogger()

testdir = os.path.dirname(__file__)


class TestBurn(TestDemurrageDefault):

    def test_burn_basic(self):
        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], 500000)
        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], 500000)
        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, 500000)


    def test_burned_redistribution(self):
        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)



#    def test_burned_other_redistribution(self):
#        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], 1024)
#        r = self.rpc.do(o)
#
#        (tx_hash, o) = c.burn(self.address, self.accounts[0], 500)
#        r = self.rpc.do(o)
#
#        (tx_hash, o) = c.transfer(self.address, self.accounts[0], self.accounts[1], 524)
#        r = self.rpc.do(o)
#        
#        self.backend.time_travel(self.start_time + self.period_seconds)
#
#        (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, 524)
#
#        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, 524)
#
#        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, 524)

if __name__ == '__main__':
    unittest.main()