Add logging test for `_parse_files()`

1 files changed, 10 insertions, 4 deletions

diff --git a/certbot-nginx/tests/parser_test.py b/certbot-nginx/tests/parser_test.py
index a0484f965..89bcf689a 100644
--- a/certbot-nginx/tests/parser_test.py
+++ b/certbot-nginx/tests/parser_test.py
@@ -491,11 +491,17 @@ class NginxParserTest(util.NginxTest):
         self.assertEqual(['listen', '80'], parsed[0][2][1][3])
 
     def test_invalid_unicode_characters(self):
-        nparser = parser.NginxParser(self.config_path)
-        # pylint: disable=protected-access
-        path = nparser.abs_path('invalid_unicode_comments.conf')
-        parsed = nparser._parse_files(path)
+        with self.assertLogs() as log:
+            nparser = parser.NginxParser(self.config_path)
+            path = nparser.abs_path('invalid_unicode_comments.conf')
+            parsed = nparser._parse_files(path)  # pylint: disable=protected-access
+
         self.assertEqual([], parsed)
+        self.assertTrue([
+            True
+            for output in log.output
+            if ('invalid character' in output) and ('UTF-8' in output)
+        ])
 
     def test_valid_unicode_characters_in_ssl_options(self):
         nparser = parser.NginxParser(self.config_path)