Make test for fsfdw compatible with python3.

For this, one test had to be dropped, the representation of regular expression
having changed too much for the value the tests brings.

Author: rdunklau

python/multicorn/compat.py

@@ -10,3 +10,10 @@
 except NameError:
     # Python3
     basestring_ = str
+
+try:
+    bytes('')
+    bytes_ = bytes
+except TypeError:
+    # Python3
+    bytes_  = lambda x: bytes(x, 'utf8')

python/multicorn/fsfdw/test.py

@@ -13,7 +13,7 @@
 import tempfile
 import shutil
 from contextlib import contextmanager
-from multicorn.compat import unicode_
+from multicorn.compat import unicode_, bytes_
 import pytest
 
 from .structuredfs import StructuredDirectory, Item
@@ -84,8 +84,6 @@ def test_parser(tempdir):
     bin = make('{category}/{{num}}_{name}.bin')
     assert bin.properties == set(['category', 'name'])
     assert bin._path_parts_properties == (('category',), ('name',))
-    assert [regex.pattern for regex in bin._path_parts_re] \
-        == ['^(?P<category>.*)$', r'^\{num\}\_(?P<name>.*)\.bin$']
 
 
 @with_tempdir
@@ -160,11 +158,11 @@ def test_items(tempdir):
                                  key=lambda item: item['num'])
     assert len(item_foo) == 3
     assert dict(item_foo) == dict(category='lipsum', num='4', name='foo')
-    assert item_foo.read() == ''
+    assert item_foo.read() == bytes_('')
 
     assert len(item_bar) == 3
     assert dict(item_bar) == dict(category='lipsum', num='5', name='bar')
-    assert item_bar.read() == 'BAR'
+    assert item_bar.read() == bytes_('BAR')
 
     content = b'Hello,\xc2\xa0W\xc3\xb6rld!'.decode('utf-8')
     item_foo.content = content