test failure in TestDateTimePatternGenerator

Created by: lfam

I am trying to build PyICU 1.9.3 (plus the fix for #19 (closed) ) using GNU Guix. I get the following test failure.

======================================================================
FAIL: testAddPattern (test.test_DateTimeParserGenerator.TestDateTimePatternGenerator)
Test overwriting a pattern with the same skeleton.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/guix-build-python-pyicu-1.9.3.drv-0/PyICU-1.9.3/test/test_DateTimeParserGenerator.py", line 47, in testAddPattern
    self.assertEqual(sdf.format(self.date), '09 mai à 17:30')
AssertionError: '09 mai 17:30' != '09 mai à 17:30'
- 09 mai 17:30
+ 09 mai à 17:30
?       ++


----------------------------------------------------------------------
Ran 37 tests in 0.637s

FAILED (failures=1)

I'm using python-3.4.3, icu4c-55.1, perl-5.22.1. Let me know what other information could help debug this.