diff --git a/qutebrowser/test/utils/test_debug.py b/qutebrowser/test/utils/test_debug.py
index 926f42261..12a5afef1 100644
--- a/qutebrowser/test/utils/test_debug.py
+++ b/qutebrowser/test/utils/test_debug.py
@@ -19,7 +19,10 @@
 
 """Tests for qutebrowser.utils.debug."""
 
+import re
+import time
 import unittest
+import logging
 
 from PyQt5.QtCore import Qt
 from PyQt5.QtWidgets import QStyle, QFrame
@@ -148,5 +151,21 @@ class TestDebug(unittest.TestCase):
                          r"fake('foo\nbar')")
 
 
+class TestLogTime(unittest.TestCase):
+
+    """Test log_time."""
+
+    def test_log_time(self):
+        logger = logging.getLogger('qt-tests')
+        with self.assertLogs(logger, logging.DEBUG) as logged:
+            with debug.log_time(logger, action='foobar'):
+                time.sleep(0.1)
+            self.assertEqual(len(logged.records), 1)
+            pattern = re.compile(r'^Foobar took ([\d.]*) seconds\.$')
+            match = pattern.match(logged.records[0].msg)
+            self.assertTrue(match)
+            duration = float(match.group(1))
+            self.assertAlmostEqual(duration, 0.1, delta=0.01)
+
 if __name__ == '__main__':
     unittest.main()