Add growth decay test, improve resolution in growth/decay in contract (SingleCap)

python/erc20_demurrage_token/token.py

@@ -323,6 +323,40 @@ class DemurrageToken(ERC20):
         return self.call_noarg('supplyCap', contract_address, sender_address=sender_address)
 
 
+    def grow_by(self, contract_address, value, period, sender_address=ZERO_ADDRESS):
+        o = jsonrpc_template()
+        o['method'] = 'eth_call'
+        enc = ABIContractEncoder()
+        enc.method('growBy')
+        enc.typ(ABIContractType.UINT256)
+        enc.typ(ABIContractType.UINT256)
+        enc.uint256(value)
+        enc.uint256(period)
+        data = add_0x(enc.get())
+        tx = self.template(sender_address, contract_address)
+        tx = self.set_code(tx, data)
+        o['params'].append(self.normalize(tx))
+        o['params'].append('latest')
+        return o
+
+
+    def decay_by(self, contract_address, value, period, sender_address=ZERO_ADDRESS):
+        o = jsonrpc_template()
+        o['method'] = 'eth_call'
+        enc = ABIContractEncoder()
+        enc.method('decayBy')
+        enc.typ(ABIContractType.UINT256)
+        enc.typ(ABIContractType.UINT256)
+        enc.uint256(value)
+        enc.uint256(period)
+        data = add_0x(enc.get())
+        tx = self.template(sender_address, contract_address)
+        tx = self.set_code(tx, data)
+        o['params'].append(self.normalize(tx))
+        o['params'].append('latest')
+        return o
+
+
     @classmethod
     def parse_actual_period(self, v):
         return abi_decode_single(ABIContractType.UINT256, v)
@@ -376,3 +410,12 @@ class DemurrageToken(ERC20):
     @classmethod
     def parse_supply_cap(self, v):
         return abi_decode_single(ABIContractType.UINT256, v)
+
+    @classmethod
+    def parse_grow_by(self, v):
+        return abi_decode_single(ABIContractType.UINT256, v)
+
+
+    @classmethod
+    def parse_decay_by(self, v):
+        return abi_decode_single(ABIContractType.UINT256, v)