Fix import error

Author: mwallace582

tests/unit/utils.py

@@ -7,7 +7,6 @@
 from unittest import mock
 from unittest import TestCase
 
-from hologram import ValidationError
 from dbt.config.project import PartialProject
 
 
@@ -146,13 +145,6 @@ def assert_symmetric(self, obj, dct, cls=None):
         self.assert_to_dict(obj, dct)
         self.assert_from_dict(obj, dct, cls)
 
-    def assert_fails_validation(self, dct, cls=None):
-        if cls is None:
-            cls = self.ContractType
-
-        with self.assertRaises(ValidationError):
-            cls.from_dict(dct)
-
 
 def generate_name_macros(package):
     from dbt.contracts.graph.parsed import ParsedMacro