diff --git a/acme/acme/challenges_test.py b/acme/acme/challenges_test.py
index ac94619b5..b32bebed0 100644
--- a/acme/acme/challenges_test.py
+++ b/acme/acme/challenges_test.py
@@ -114,7 +114,7 @@ class DNS01ResponseTest(unittest.TestCase):
         self.assertTrue(self.response.simple_verify(
             self.chall, "local", KEY.public_key()))
         mock_resolver.assert_called_once_with(
-                self.chall.validation_domain_name("local"))
+            self.chall.validation_domain_name("local"))
 
     @mock.patch("acme.dns_resolver.txt_records_for_name")
     def test_simple_verify_good_validation_multiple_txts(self, mock_resolver):
diff --git a/acme/acme/dns_resolver_test.py b/acme/acme/dns_resolver_test.py
index 5d160fc07..39645c492 100644
--- a/acme/acme/dns_resolver_test.py
+++ b/acme/acme/dns_resolver_test.py
@@ -9,28 +9,28 @@ try:
 except ImportError:  # pragma: no cover
     dns = None
 
+def create_txt_response(name, txt_records):
+    """
+    Returns an RRSet containing the 'txt_records' as the result of a DNS
+    query for 'name'.
+
+    This takes advantage of the fact that an Answer object mostly behaves
+    like an RRset.
+    """
+    return dns.rrset.from_text_list(name, 60, "IN", "TXT", txt_records)
+
 
 class TxtRecordsForNameTest(unittest.TestCase):
 
-    def create_txt_response(self, name, txt_records):
-        """
-        Returns an RRSet containing the 'txt_records' as the result of a DNS
-        query for 'name'.
-
-        This takes advantage of the fact that an Answer object mostly behaves
-        like an RRset.
-        """
-        return dns.rrset.from_text_list(name, 60, "IN", "TXT", txt_records)
-
     @mock.patch("acme.dns_resolver.dns.resolver.query")
-    def test_txt_records_for_name_test_with_single_response(self, mock_dns):
-        mock_dns.return_value = self.create_txt_response('name', ['response'])
+    def test_txt_records_for_name_with_single_response(self, mock_dns):
+        mock_dns.return_value = create_txt_response('name', ['response'])
         self.assertEqual(['response'],
                          dns_resolver.txt_records_for_name('name'))
 
     @mock.patch("acme.dns_resolver.dns.resolver.query")
     def test_txt_records_for_name_with_multiple_responses(self, mock_dns):
-        mock_dns.return_value = self.create_txt_response(
+        mock_dns.return_value = create_txt_response(
             'name', ['response1', 'response2'])
         self.assertEqual(['response1', 'response2'],
                          dns_resolver.txt_records_for_name('name'))