Create demurrage calc from contract

python/tests/test_demurrage_ext.py

@@ -2,7 +2,11 @@
 import datetime
 import unittest
 
+# external imports
+from chainlib.eth.nonce import RPCNonceOracle
+
 # local imports
+from erc20_demurrage_token import DemurrageToken
 from erc20_demurrage_token.demurrage import DemurrageCalculator
 
 # test imports
@@ -19,5 +23,13 @@ class TestEmulate(TestDemurrage):
         self.assert_within_lower(a, 99.69667, 0.1)
 
 
+    def test_from_contract(self):
+        nonce_oracle = RPCNonceOracle(self.accounts[0], self.rpc)
+        c = DemurrageToken(self.chain_spec, signer=self.signer, nonce_oracle=nonce_oracle)
+        self.deploy(c, 'SingleNocap')
+        dc = DemurrageCalculator.from_contract(self.rpc, self.chain_spec, self.address, sender_address=self.accounts[0])
+        self.assertEqual(dc.r_min, 0.02)
+
+
 if __name__ == '__main__':
     unittest.main()