Add mint amounts test

python/tests/base.py

@@ -92,6 +92,13 @@ class TestDemurrage(EthTesterCase):
         logg.debug('contract address {} start block {} start time {}'.format(self.address, self.start_block, self.start_time))
 
 
+    def assert_within_lower(self, v, target, tolerance_ppm):
+        lower_target = target - (target * (tolerance_ppm / 1000000))
+        self.assertGreaterEqual(v, lower_target)
+        self.assertLessEqual(v, target)
+        logg.debug('asserted within lower {} <= {} <= {}'.format(lower_target, v, target))
+
+
     def tearDown(self):
         pass
 

python/tests/test_amounts.py

@@ -0,0 +1,64 @@
+# standard imports
+import os
+import unittest
+import json
+import logging
+
+# external imports
+from chainlib.eth.constant import ZERO_ADDRESS
+from chainlib.eth.nonce import RPCNonceOracle
+from chainlib.eth.tx import receipt
+
+# local imports
+from erc20_demurrage_token import DemurrageToken
+
+# test imports
+from tests.base import TestDemurrageDefault
+
+logging.basicConfig(level=logging.DEBUG)
+logg = logging.getLogger()
+
+testdir = os.path.dirname(__file__)
+
+class TestAmounts(TestDemurrageDefault):
+
+    def test_mints(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], 1000)
+        r = self.rpc.do(o)
+
+        self.backend.time_travel(self.start_time + self.period_seconds)
+
+        (tx_hash, o) = c.apply_demurrage(self.address, self.accounts[0])
+        r = self.rpc.do(o)
+        
+        o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        balance = c.parse_balance_of(r)
+        self.assertEqual(balance, 817)
+
+        (tx_hash, o) = c.mint_to(self.address, self.accounts[0], self.accounts[1], 1000)
+        r = self.rpc.do(o)
+
+        o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        balance = c.parse_balance_of(r)
+        self.assert_within_lower(balance, 1817, 750)
+
+        self.backend.time_travel(self.start_time + self.period_seconds * 2)
+
+        (tx_hash, o) = c.apply_demurrage(self.address, self.accounts[0])
+        r = self.rpc.do(o)
+        
+        o = c.balance_of(self.address, self.accounts[1], sender_address=self.accounts[0])
+        r = self.rpc.do(o)
+        balance = c.parse_balance_of(r)
+
+        expected_balance = ((1 - self.tax_level / 1000000) ** 10) * 1000
+        expected_balance += ((1 - self.tax_level / 1000000) ** 20) * 1000
+        self.assert_within_lower(balance, expected_balance, 500)
+
+
+if __name__ == '__main__':
+    unittest.main()

python/tests/test_period.py

@@ -102,5 +102,6 @@ class TestPeriod(TestDemurrageDefault):
         period = int(period) * (10 ** (38 - 9))
         self.assertEqual(modifier, period)
 
+
 if __name__ == '__main__':
     unittest.main()