Fix fstest tests on Python 3

src/ZODB/scripts/fstest.py

@@ -36,7 +36,7 @@
 # ZODB.FileStorage.  If anything about the FileStorage layout changes,
 # this file will need to be udpated.
 
-import string
+import binascii
 import struct
 import sys
 
@@ -55,16 +55,13 @@ class Status:
 VERBOSE = 0
 
 def hexify(s):
-    """Format an 8-bit string as hex"""
-    l = []
-    for c in s:
-        h = hex(ord(c))
-        if h[:2] == '0x':
-            h = h[2:]
-        if len(h) == 1:
-            l.append("0")
-        l.append(h)
-    return "0x" + ''.join(l)
+    r"""Format an 8-bit string as hex
+
+        >>> hexify(b'\x00\xff\xaa\xcc')
+        '0x00ffaacc'
+
+    """
+    return '0x' + binascii.hexlify(s).decode()
 
 def chatter(msg, level=1):
     if VERBOSE >= level:

src/ZODB/scripts/tests/test_fstest.py

@@ -11,9 +11,13 @@
 # FOR A PARTICULAR PURPOSE.
 #
 ##############################################################################
-from zope.testing import setupstack
 import doctest
+import re
+import unittest
+
 import ZODB
+from zope.testing import setupstack
+from zope.testing.renormalizing import RENormalizing
 
 def test_fstest_verbose():
     r"""
@@ -39,6 +43,13 @@ def test_fstest_verbose():
 
 
 def test_suite():
-    return doctest.DocTestSuite(
-        setUp=setupstack.setUpDirectory, tearDown=setupstack.tearDown)
+    checker = RENormalizing([
+        # Python 3 drops the u'' prefix on unicode strings
+        (re.compile(r"u('[^']*')"), r"\1"),
+    ])
+    return unittest.TestSuite([
+        doctest.DocTestSuite('ZODB.scripts.fstest', checker=checker),
+        doctest.DocTestSuite(setUp=setupstack.setUpDirectory,
+                             tearDown=setupstack.tearDown),
+    ])