diff --git a/glymur/jp2box.py b/glymur/jp2box.py
index 149af0a..5bbe733 100644
--- a/glymur/jp2box.py
+++ b/glymur/jp2box.py
@@ -1792,14 +1792,14 @@ class XMLBox(Jp2kBox):
         text = read_buffer.decode('utf-8')
 
         # Strip out any trailing nulls, as they can foul up XML parsing.
-        text = text.rstrip('\0')
+        text = text.rstrip(chr(0))
 
         try:
             elt = ET.fromstring(text)
             xml = ET.ElementTree(elt)
         except ParseError as parse_error:
             msg = 'A problem was encountered while parsing an XML box:'
-            msg += '\n\n\t"{0}"\n\nNo XML was retrieved.'  
+            msg += '\n\n\t"{0}"\n\nNo XML was retrieved.'
             msg = msg.format(str(parse_error))
             warnings.warn(msg, UserWarning)
             xml = None
diff --git a/glymur/test/fixtures.py b/glymur/test/fixtures.py
index 39b4ac5..cbfbc3b 100644
--- a/glymur/test/fixtures.py
+++ b/glymur/test/fixtures.py
@@ -57,7 +57,7 @@ def read_pgx(pgx_file):
                     header += chr(char[0])
 
     header = header.rstrip()
-    tokens = re.split('\s', header)
+    tokens = re.split(r'\s', header)
 
     if (tokens[1][0] == 'M') and (sys.byteorder == 'little'):
         swapbytes = True
diff --git a/glymur/test/test_callbacks.py b/glymur/test/test_callbacks.py
index 47ec100..712dd5f 100644
--- a/glymur/test/test_callbacks.py
+++ b/glymur/test/test_callbacks.py
@@ -88,7 +88,7 @@ class TestCallbacks15(unittest.TestCase):
             with patch('sys.stdout', new=StringIO()) as fake_out:
                 d = j.read(rlevel=1, verbose=True)
                 actual = fake_out.getvalue().strip()
-    
+
             regex = re.compile(r"""\[INFO\]\stile\s1\sof\s1\s+
                                    \[INFO\]\s-\stiers-1\stook\s
                                            [0-9]+\.[0-9]+\ss\s+
diff --git a/glymur/test/test_jp2k.py b/glymur/test/test_jp2k.py
index f0db4b7..6e1e7a0 100644
--- a/glymur/test/test_jp2k.py
+++ b/glymur/test/test_jp2k.py
@@ -7,6 +7,7 @@ import struct
 import sys
 import tempfile
 import uuid
+from xml.etree import cElementTree as ET
 
 if sys.hexversion < 0x02070000:
     import unittest2 as unittest
@@ -623,6 +624,8 @@ class TestJp2k(unittest.TestCase):
             self.assertEqual(jp2k.box[3].box_id, 'xml ')
             self.assertEqual(jp2k.box[3].offset, 77)
             self.assertEqual(jp2k.box[3].length, 36)
+            self.assertEqual(ET.tostring(jp2k.box[3].xml.getroot()),
+                             b'<test>this is a test</test>')
 
     @unittest.skipIf(os.name == "nt", "NamedTemporaryFile issue on windows")
     def test_asoc_label_box(self):
diff --git a/glymur/test/test_opj_suite.py b/glymur/test/test_opj_suite.py
index b6de353..c2b5f15 100644
--- a/glymur/test/test_opj_suite.py
+++ b/glymur/test/test_opj_suite.py
@@ -3809,7 +3809,7 @@ class TestSuiteDump(unittest.TestCase):
                           32, 32, 131, 2002, 2002, 1888])
         self.assertEqual(c.segment[3]._exponent,
                          [17, 17, 17, 17, 16, 16, 16, 15, 15, 15, 14, 14,
-                         14, 13, 13, 13, 11, 11, 11, 11, 11, 11])
+                          14, 13, 13, 13, 11, 11, 11, 11, 11, 11])
 
         # COM: comment
         # Registration
@@ -4596,10 +4596,10 @@ class TestSuiteDump(unittest.TestCase):
         self.assertEqual(c.segment[7].sqcc & 0x1f, 2)  # none
         self.assertEqual(c.segment[7]._mantissa,
                          [1824, 1776, 1776, 1728, 1792, 1792, 1760, 1872,
-                         1872, 1896, 5, 5, 71, 2003, 2003, 1890])
+                          1872, 1896, 5, 5, 71, 2003, 2003, 1890])
         self.assertEqual(c.segment[7]._exponent,
                          [18, 18, 18, 18, 17, 17, 17, 16, 16, 16, 14, 14,
-                         14, 14, 14, 14])
+                          14, 14, 14, 14])
 
         # COM: comment
         # Registration
@@ -5634,7 +5634,7 @@ class TestSuiteDump(unittest.TestCase):
         self.assertEqual(c.segment[3]._mantissa, [0] * 16)
         self.assertEqual(c.segment[3]._exponent,
                          [18, 19, 19, 20, 19, 19, 20, 19, 19, 20, 19, 19, 20,
-                         19, 19, 20])
+                          19, 19, 20])
 
         # COM: comment
         # Registration