diff --git a/tests/storage/dav/servers/radicale/__init__.py b/tests/storage/dav/servers/radicale/__init__.py
index 43b3bed..1faf706 100644
--- a/tests/storage/dav/servers/radicale/__init__.py
+++ b/tests/storage/dav/servers/radicale/__init__.py
@@ -43,6 +43,7 @@ create table property (
 
 storage_backend = os.environ.get('RADICALE_BACKEND', '') or 'filesystem'
 
+
 def do_the_radicale_dance(tmpdir):
     # All of radicale is already global state, the cleanliness of the code and
     # all hope is already lost. This function runs before every test.
diff --git a/tests/storage/dav/test_main.py b/tests/storage/dav/test_main.py
index b0257fa..1d7a721 100644
--- a/tests/storage/dav/test_main.py
+++ b/tests/storage/dav/test_main.py
@@ -23,6 +23,7 @@ import requests.exceptions
 
 dav_server = os.environ.get('DAV_SERVER', '').strip() or 'radicale'
 
+
 def _get_server_mixin(server_name):
     from . import __name__ as base
     x = __import__('{}.servers.{}'.format(base, server_name), fromlist=[''])
@@ -102,7 +103,6 @@ class DavStorageTests(ServerMixin, StorageTests):
         super(DavStorageTests, self).test_update_nonexisting()
 
 
-
 class TestCaldavStorage(DavStorageTests):
     storage_class = CaldavStorage
 
@@ -240,12 +240,12 @@ class TestCaldavStorage(DavStorageTests):
         monkeypatch.setattr('requests.sessions.Session.request', request)
 
         with pytest.raises(vdirsyncer.exceptions.StorageError):
-            s = self.storage_class(**args)
+            self.storage_class(**args)
         assert len(calls) == 1
 
     def test_empty_get_multi_performance(self, monkeypatch):
         s = self._get_storage()
-        
+
         def breakdown(*a, **kw):
             raise AssertionError('Expected not to be called.')
 
@@ -253,6 +253,7 @@ class TestCaldavStorage(DavStorageTests):
 
         assert list(s.get_multi([])) == []
 
+
 class TestCarddavStorage(DavStorageTests):
     storage_class = CarddavStorage
     item_template = VCARD_TEMPLATE
diff --git a/tests/test_sync.py b/tests/test_sync.py
index fa255b0..0d60b6d 100644
--- a/tests/test_sync.py
+++ b/tests/test_sync.py
@@ -167,6 +167,7 @@ def test_conflict_resolution_new_etags_without_changes():
     sync(a, b, status)
     assert status == {'1': (href_a, etag_a, href_b, etag_b)}
 
+
 def test_uses_get_multi(monkeypatch):
     def breakdown(*a, **kw):
         raise AssertionError('Expected use of get_multi')
diff --git a/vdirsyncer/storage/base.py b/vdirsyncer/storage/base.py
index 83f89c7..32701ab 100644
--- a/vdirsyncer/storage/base.py
+++ b/vdirsyncer/storage/base.py
@@ -9,6 +9,7 @@
 
 from .. import exceptions
 
+
 class Item(object):
 
     '''should-be-immutable wrapper class for VCALENDAR and VCARD'''
diff --git a/vdirsyncer/storage/dav.py b/vdirsyncer/storage/dav.py
index 17a7fad..4e1c9da 100644
--- a/vdirsyncer/storage/dav.py
+++ b/vdirsyncer/storage/dav.py
@@ -335,7 +335,7 @@ class CaldavStorage(DavStorage):
             end = end.strftime(CALDAV_DT_FORMAT)
 
             timefilter = ('<C:time-range start="{start}" end="{end}"/>'
-                .format(start=start, end=end))
+                          .format(start=start, end=end))
         else:
             timefilter = ''