Add Velvet smoke check

eth_defi/velvet/vault.py

@@ -94,12 +94,18 @@ def has_deposit_distribution_to_all_positions(self):
     def get_flow_manager(self):
         raise NotImplementedError("Velvet does not support individual deposit/redemption events yet")
 
-    def check_valid_vault_contract(self):
+    def check_valid_contract(self):
         """Check that we have connected to a proper Velvet capital vault contract, not wrong contract.
 
         :raise AssertionError:
             Looks bad
         """
+        try:
+            portfolio_contract = self.portfolio_contract
+            config = portfolio_contract.functions.protocolConfig().call()
+            assert config.startswith("0x")
+        except Exception as e:
+            raise AssertionError(f"Does not look like a Velvet portfolio contract: {self.portfolio_address}") from e
 
     def fetch_info(self) -> VelvetVaultInfo:
         """Read vault parameters from the chain."""
@@ -116,10 +122,11 @@ def vault_address(self) -> HexAddress:
         return self.info["vaultAddress"]
 
     @property
-    def vault_contract(self) -> Contract:
+    def portfolio_contract(self) -> Contract:
         return get_deployed_contract(
             self.web3,
-            "velvet/"
+            "velvet/PortfolioV3_4.json",
+            self.portfolio_address
         )
 
     @property

tests/velvet/test_velvet_api.py

@@ -189,6 +189,8 @@ def test_fetch_info(vault: VelvetVault):
     assert vault.vault_address == "0x9d247fbc63e4d50b257be939a264d68758b43d04"
     assert vault.owner_address == "0x0c9db006f1c7bfaa0716d70f012ec470587a8d4f"
 
+    vault.check_valid_contract()
+
 
 def test_fetch_vault_portfolio(vault: VelvetVault):
     """Read vault token balances."""