Resolve typing ImportError in policy

nucypher/blockchain/eth/policies.py

@@ -114,7 +114,7 @@ class BlockchainPolicy(Policy):
 
     def __find_ursulas(self, ether_addresses: List[str], target_quantity: int, timeout: int = 120):
         start_time = maya.now()  # Marker for timeout calculation
-        found_ursulas, unknown_addresses = set(), deque()  # type: Tuple[set, deque]
+        found_ursulas, unknown_addresses = set(), deque()  # type: set, deque
         while len(found_ursulas) < target_quantity:
 
             # Check for a timeout

nucypher/utilities/sandbox/policy.py

@@ -1,5 +1,5 @@
 from collections import OrderedDict
-from typing import List
+from typing import List, Set
 
 import maya
 
@@ -34,7 +34,9 @@ class MockPolicy(Policy):
                                           hrac=self.hrac(),
                                           expiration=expiration)
 
-            self.consider_arrangement(network_middleware=network_middleware, arrangement=arrangement)
+            self.consider_arrangement(network_middleware=network_middleware,
+                                      ursula=ursula,
+                                      arrangement=arrangement)
 
 
 class MockPolicyCreation: