Add validation error instead of key error to validation error

Author: kclowes

tests/core/middleware/test_transaction_signing.py

@@ -27,6 +27,9 @@
 from web3.providers.eth_tester import (
     EthereumTesterProvider,
 )
+from eth_tester.exceptions import (
+    ValidationError,
+)
 from web3.utils.toolz import (
     identity,
     merge,
@@ -231,12 +234,12 @@ def fund_account(w3):
         ),
         (
             # Transaction with mismatched sender
-            # expect a key error with sendTransaction + unmanaged account
+            # expect a validation error with sendTransaction + unmanaged account
             {
                 'gas': 21000,
                 'value': 10
             },
-            KeyError,
+            ValidationError,
             SAME_KEY_MIXED_TYPE,
             ADDRESS_2,
         ),