--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -21,7 +21,7 @@ def system_path():
 
 
 @pytest.yield_fixture
-def system():
+def system(system_path):
     '''
     yields the contents of the system.evtx test file.
     the returned value is a memory map of the contents,
@@ -30,8 +30,7 @@ def system():
     Returns:
       mmap.mmap: the contents of the test file.
     '''
-    p = system_path()
-    with open(p, 'rb') as f:
+    with open(system_path, 'rb') as f:
         with contextlib.closing(mmap.mmap(f.fileno(), 0,
                                           access=mmap.ACCESS_READ)) as buf:
             yield buf
@@ -52,7 +51,7 @@ def security_path():
 
 
 @pytest.yield_fixture
-def security():
+def security(security_path):
     '''
     yields the contents of the security.evtx test file.
     the returned value is a memory map of the contents,
@@ -61,8 +60,7 @@ def security():
     Returns:
       mmap.mmap: the contents of the test file.
     '''
-    p = security_path()
-    with open(p, 'rb') as f:
+    with open(security_path, 'rb') as f:
         with contextlib.closing(mmap.mmap(f.fileno(), 0,
                                           access=mmap.ACCESS_READ)) as buf:
             yield buf
--- a/tests/test_records.py
+++ b/tests/test_records.py
@@ -248,7 +248,7 @@ def test_parse_record(system):
                     ['EndOfStreamNode']]]]],
               ['Substitutions', None, [
                 ['WstringTypeNode', 'System'],
-                ['WstringTypeNode', 'C:\Windows\System32\Winevt\Logs\Archive-System-2012-03-14-04-17-39-932.evtx']]]]]]]]]]]
+                ['WstringTypeNode', 'C:\\Windows\\System32\\Winevt\\Logs\\Archive-System-2012-03-14-04-17-39-932.evtx']]]]]]]]]]]
 
     assert extract_structure(record.root()) == expected
 
@@ -264,7 +264,7 @@ def test_render_record(system):
     chunk = one(fh.chunks())
     record = one(chunk.records())
 
-    xml = record.xml() 
+    xml = record.xml()
     assert xml == textwrap.dedent('''\
                                      <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Eventlog" Guid="{fc65ddd8-d6ef-4962-83d5-6e5cfe9ce148}"></Provider>
                                      <EventID Qualifiers="">105</EventID>