diff --git a/contrib/python3-whitelist b/contrib/python3-whitelist
--- a/contrib/python3-whitelist
+++ b/contrib/python3-whitelist
@@ -452,6 +452,7 @@
 test-template-engine.t
 test-treemanifest.t
 test-ui-color.py
+test-ui-verbosity.py
 test-unamend.t
 test-uncommit.t
 test-unified-test.t
diff --git a/tests/test-ui-verbosity.py b/tests/test-ui-verbosity.py
--- a/tests/test-ui-verbosity.py
+++ b/tests/test-ui-verbosity.py
@@ -38,9 +38,9 @@
 
     u = uimod.ui.load()
     if cmd_quiet or cmd_debug or cmd_verbose:
-        u.setconfig('ui', 'quiet', str(bool(cmd_quiet)))
-        u.setconfig('ui', 'verbose', str(bool(cmd_verbose)))
-        u.setconfig('ui', 'debug', str(bool(cmd_debug)))
+        u.setconfig(b'ui', b'quiet', pycompat.bytestr(bool(cmd_quiet)))
+        u.setconfig(b'ui', b'verbose', pycompat.bytestr(bool(cmd_verbose)))
+        u.setconfig(b'ui', b'debug', pycompat.bytestr(bool(cmd_debug)))
 
     check = ''
     if u.debugflag: