functional_tests: add get_fee_estimate to blockchain test

tests/functional_tests/blockchain.py

@@ -70,6 +70,12 @@ class BlockchainTest():
         except: ok = True
         assert ok
 
+        res = daemon.get_fee_estimate()
+        assert res.fee == 234562
+        assert res.quantization_mask == 10000
+        res = daemon.get_fee_estimate(10)
+        assert res.fee <= 234562
+
         # generate blocks
         res_generateblocks = daemon.generateblocks('42ey1afDFnn4886T7196doS9GPMzexD9gXpsZJDwVjeRVdFCSoHnv7KPbBeGpzJBzHRCAs9UxqeoyFQMYbqSWYTfJJQAWDm', blocks)
 
@@ -221,6 +227,12 @@ class BlockchainTest():
             assert res.histogram[i].unlocked_instances == 0
             assert res.histogram[i].recent_instances == 0
 
+        res = daemon.get_fee_estimate()
+        assert res.fee == 234560
+        assert res.quantization_mask == 10000
+        res = daemon.get_fee_estimate(10)
+        assert res.fee <= 234560
+
     def _test_alt_chains(self):
         print('Testing alt chains')
         daemon = Daemon()

utils/python-rpc/framework/daemon.py

@@ -330,3 +330,14 @@ class Daemon(object):
             'id': '0'
         }
         return self.rpc.send_json_rpc_request(get_alternate_chains)
+
+    def get_fee_estimate(self, grace_blocks = 0):
+        get_fee_estimate = {
+            'method': 'get_fee_estimate',
+            'params': {
+                'grace_blocks': grace_blocks,
+            },
+            'jsonrpc': '2.0',
+            'id': '0'
+        }
+        return self.rpc.send_json_rpc_request(get_fee_estimate)