diff --git a/letsencrypt/tests/display/ops_test.py b/letsencrypt/tests/display/ops_test.py
index b0b905c33..60874a007 100644
--- a/letsencrypt/tests/display/ops_test.py
+++ b/letsencrypt/tests/display/ops_test.py
@@ -385,7 +385,17 @@ class ChooseNamesTest(unittest.TestCase):
 
         self.assertEqual(self._call(self.mock_install), [])
 
+    def test_get_valid_domains(self):
+        from letsencrypt.display_ops import get_valid_domains
+        all_valid = ["example.com", "second.example.com",
+                     "also.example.com"]
+        all_invalid = ["xn--ls8h.tld", "*.wildcard.com", "notFQDN"]
+        two_valid = ["example.com", "xn--ls8h.tld", "also.example.com"]
+        self.assertEqual(get_valid_domains(all_valid), all_valid)
+        self.assertEqual(get_valid_domains(all_invalid), [])
+        self.assertEqual(len(get_valid_domains(two_valid)), 2)
 
+        
 class SuccessInstallationTest(unittest.TestCase):
     # pylint: disable=too-few-public-methods
     """Test the success installation message."""