Add basic test for custom abi condition

tests/data/test_conditions.json

@@ -1,4 +1,46 @@
 {
+  "TStaking": {
+    "contractAddress": "0x01B67b1194C75264d06F808A921228a95C765dd7",
+    "chain": "ethereum",
+    "method": "stakes",
+    "functionAbi": {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "stakingProvider",
+          "type": "address"
+        }
+      ],
+      "name": "stakes",
+      "outputs": [
+        {
+          "internalType": "uint96",
+          "name": "tStake",
+          "type": "uint96"
+        },
+        {
+          "internalType": "uint96",
+          "name": "keepInTStake",
+          "type": "uint96"
+        },
+        {
+          "internalType": "uint96",
+          "name": "nuInTStake",
+          "type": "uint96"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    "parameters": [
+      ":userAddress"
+    ],
+    "returnValueTest": {
+      "key": "tStake",
+      "comparator": ">",
+      "value": 0
+    }
+  },
   "SubscriptionManagerPayment": {
     "contractAddress": "0xaDD9D957170dF6F33982001E4c22eCCdd5539118",
     "chain": 137,

tests/unit/conditions/conftest.py

@@ -41,6 +41,11 @@ def mock_condition_blockchains(mocker):
     mocker.patch.object(nucypher.policy.conditions.evm, '_CONDITION_CHAINS', tuple([131277322940537]))
 
 
+@pytest.fixture()
+def TStaking_data():
+    return json.dumps(VECTORS["TStaking"])
+
+
 # ERC1155
 
 @pytest.fixture()

tests/unit/conditions/test_evm_condition_serializers.py

@@ -22,12 +22,20 @@ from nucypher.policy.conditions.evm import ContractCondition
 from nucypher.policy.conditions.lingo import ConditionLingo
 
 
+def test_evm_condition_function_abi(TStaking_data):
+    original_data = TStaking_data
+    condition = ContractCondition.from_json(original_data)
+    serialized_data = condition.to_json()
+
+    deserialized_data = json.loads(serialized_data)
+    assert deserialized_data["functionAbi"] == condition.function_abi
+
+
 def test_evm_condition_json_serializers(ERC1155_balance_condition_data):
     original_data = ERC1155_balance_condition_data
     condition = ContractCondition.from_json(original_data)
     serialized_data = condition.to_json()
 
-    # TODO functionAbi is present in serialized data
     deserialized_data = json.loads(serialized_data)
     deserialized_data.pop("functionAbi")