test_univar stderr

/usr/lib/python2.7/xml/etree/ElementTree.py:1638: DeprecationWarning: This method of XMLParser is deprecated.  Define doctype() method on the TreeBuilder target.
  DeprecationWarning,
FF....
======================================================================
FAIL: test_1 (__main__.TestRasterUnivar)
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Traceback (most recent call last):
  File "temporal/t.rast3d.univar/testsuite/test_univar.py", line 61, in test_1
    self.assertLooksLike(ref_line,  res_line)
  File "etc/python/grass/gunittest/case.py", line 190, in assertLooksLike
    'reference argument is not a string'))
AssertionError: reference argument is not a string 
False is not true

======================================================================
FAIL: test_2 (__main__.TestRasterUnivar)
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Traceback (most recent call last):
  File "temporal/t.rast3d.univar/testsuite/test_univar.py", line 79, in test_2
    self.assertLooksLike(ref_line,  res_line)
  File "etc/python/grass/gunittest/case.py", line 190, in assertLooksLike
    'reference argument is not a string'))
AssertionError: reference argument is not a string 
False is not true

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Ran 6 tests in 8.142s
FAILED (failures=2)