diff --git a/tests/test-trusted.py b/tests/test-trusted.py
--- a/tests/test-trusted.py
+++ b/tests/test-trusted.py
@@ -254,26 +254,15 @@
 f.write(b'foo')
 f.close()
 
-# This is a hack to remove b'' prefixes from ParseError.__bytes__ on
-# Python 3.
-def normalizeparseerror(e):
-    if pycompat.ispy3:
-        args = [a.decode('utf-8') for a in e.args]
-    else:
-        args = e.args
-
-    return error.ParseError(*args)
-
-
 try:
     testui(user=b'abc', group=b'def', silent=True)
 except error.ParseError as inst:
-    bprint(normalizeparseerror(inst))
+    bprint(inst.format())
 
 try:
     testui(debug=True, silent=True)
 except error.ParseError as inst:
-    bprint(normalizeparseerror(inst))
+    bprint(inst.format())
 
 print()
 bprint(b'# access typed information')
diff --git a/tests/test-trusted.py.out b/tests/test-trusted.py.out
--- a/tests/test-trusted.py.out
+++ b/tests/test-trusted.py.out
@@ -176,7 +176,8 @@
 not trusting file .hg/hgrc from untrusted user abc, group def
 ignored: ('foo', '.hg/hgrc:1')
 # same user, same group
-ParseError('foo', '.hg/hgrc:1')
+hg: parse error at .hg/hgrc:1: foo
+
 
 # access typed information
 # different user, different group