diff --git a/glymur/test/test_callbacks.py b/glymur/test/test_callbacks.py
index 5b6bd74..ef61bc4 100644
--- a/glymur/test/test_callbacks.py
+++ b/glymur/test/test_callbacks.py
@@ -11,7 +11,6 @@ import os
 import re
 import sys
 import tempfile
-import warnings
 
 import unittest
 
@@ -41,8 +40,7 @@ class TestCallbacks(unittest.TestCase):
     def test_info_callback_on_write(self):
         """Verify messages printed when writing an image in verbose mode."""
         j = glymur.Jp2k(self.jp2file)
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             tiledata = j.read(tile=0)
         with tempfile.NamedTemporaryFile(suffix='.jp2') as tfile:
             j = glymur.Jp2k(tfile.name, 'wb')
diff --git a/glymur/test/test_codestream.py b/glymur/test/test_codestream.py
index abea7e2..3b22807 100644
--- a/glymur/test/test_codestream.py
+++ b/glymur/test/test_codestream.py
@@ -13,7 +13,6 @@ import struct
 import sys
 import tempfile
 import unittest
-import warnings
 
 from glymur import Jp2k
 import glymur
diff --git a/glymur/test/test_config.py b/glymur/test/test_config.py
index b8c97ae..2e3d6d0 100644
--- a/glymur/test/test_config.py
+++ b/glymur/test/test_config.py
@@ -16,7 +16,6 @@ import os
 import sys
 import tempfile
 import unittest
-import warnings
 
 if sys.hexversion <= 0x03030000:
     from mock import patch
@@ -84,11 +83,9 @@ class TestSuite(unittest.TestCase):
                     with patch.dict('os.environ', {'XDG_CONFIG_HOME': tdir}):
                         # Misconfigured new configuration file should
                         # be rejected.
-                        with warnings.catch_warnings(record=True) as w:
-                            warnings.simplefilter('always')
+                        regex = 'could not be loaded'
+                        with self.assertWarnsRegex(UserWarning, regex):
                             imp.reload(glymur.lib.openjp2)
-                            self.assertTrue(issubclass(w[0].category,UserWarning))
-                            self.assertTrue('could not be loaded' in str(w[0].message))
 
 
 @unittest.skipIf(glymur.lib.openjp2.OPENJP2 is None and
diff --git a/glymur/test/test_glymur_warnings.py b/glymur/test/test_glymur_warnings.py
index 7641d73..d222081 100644
--- a/glymur/test/test_glymur_warnings.py
+++ b/glymur/test/test_glymur_warnings.py
@@ -12,7 +12,6 @@ import struct
 import sys
 import tempfile
 import unittest
-import warnings
 
 import six
 
diff --git a/glymur/test/test_icc.py b/glymur/test/test_icc.py
index e41042b..71819f3 100644
--- a/glymur/test/test_icc.py
+++ b/glymur/test/test_icc.py
@@ -9,7 +9,6 @@ import datetime
 import os
 import sys
 import unittest
-import warnings
 
 import numpy as np
 
@@ -31,9 +30,8 @@ class TestICC(unittest.TestCase):
     def test_file5(self):
         """basic ICC profile"""
         filename = opj_data_file('input/conformance/file5.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # The file has a bad compatibility list entry.  Not important here.
-            warnings.simplefilter("ignore")
             j = Jp2k(filename)
         profile = j.box[3].box[1].icc_profile
         self.assertEqual(profile['Size'], 546)
diff --git a/glymur/test/test_jp2box.py b/glymur/test/test_jp2box.py
index e0f12e2..03a8171 100644
--- a/glymur/test/test_jp2box.py
+++ b/glymur/test/test_jp2box.py
@@ -23,7 +23,6 @@ import tempfile
 import uuid
 from uuid import UUID
 import unittest
-import warnings
 
 import lxml.etree as ET
 import numpy as np
@@ -365,12 +364,9 @@ class TestChannelDefinition(unittest.TestCase):
         channel_type = (COLOR, COLOR, 3)
         association = (RED, GREEN, BLUE)
 
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        with self.assertWarns(UserWarning):
             glymur.jp2box.ChannelDefinitionBox(channel_type=channel_type,
                                                association=association)
-            self.assertEqual(len(w), 1)
-            self.assertTrue(issubclass(w[0].category, UserWarning))
 
     def test_wrong_lengths(self):
         """Should reject if not all of index, channel_type, association the
@@ -378,12 +374,9 @@ class TestChannelDefinition(unittest.TestCase):
         """
         channel_type = (COLOR, COLOR)
         association = (RED, GREEN, BLUE)
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        with self.assertWarns(UserWarning):
             glymur.jp2box.ChannelDefinitionBox(channel_type=channel_type,
                                                association=association)
-            self.assertEqual(len(w), 1)
-            self.assertTrue(issubclass(w[0].category, UserWarning))
 
 
 class TestFileTypeBox(unittest.TestCase):
@@ -397,8 +390,7 @@ class TestFileTypeBox(unittest.TestCase):
 
     def test_brand_unknown(self):
         """A ftyp box brand must be 'jp2 ' or 'jpx '."""
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             ftyp = glymur.jp2box.FileTypeBox(brand='jp3')
         with self.assertRaises(IOError):
             with tempfile.TemporaryFile() as tfile:
@@ -406,9 +398,8 @@ class TestFileTypeBox(unittest.TestCase):
 
     def test_cl_entry_unknown(self):
         """A ftyp box cl list can only contain 'jp2 ', 'jpx ', or 'jpxb'."""
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Bad compatibility list item.
-            warnings.simplefilter("ignore")
             ftyp = glymur.jp2box.FileTypeBox(compatibility_list=['jp3'])
         with self.assertRaises(IOError):
             with tempfile.TemporaryFile() as tfile:
@@ -481,39 +472,29 @@ class TestColourSpecificationBox(unittest.TestCase):
 
     def test_colr_with_cspace_and_icc(self):
         """Colour specification boxes can't have both."""
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        regex = 'Colorspace and icc_profile cannot both be set'
+        with self.assertWarnsRegex(UserWarning, regex):
             colorspace = glymur.core.SRGB
             rawb = b'\x01\x02\x03\x04'
             glymur.jp2box.ColourSpecificationBox(colorspace=colorspace,
                                                  icc_profile=rawb)
-            self.assertTrue(issubclass(w[0].category,UserWarning))
-            msg = 'Colorspace and icc_profile cannot both be set'
-            self.assertTrue(msg in str(w[0].message))
 
     def test_colr_with_bad_method(self):
         """colr must have a valid method field"""
         colorspace = glymur.core.SRGB
         method = -1
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        regex = 'Invalid method'
+        with self.assertWarnsRegex(UserWarning, regex):
             glymur.jp2box.ColourSpecificationBox(colorspace=colorspace,
                                                  method=method)
-            self.assertTrue(issubclass(w[0].category,UserWarning))
-            msg = 'Invalid method'
-            self.assertTrue(msg in str(w[0].message))
 
     def test_colr_with_bad_approx(self):
         """colr should have a valid approximation field"""
         colorspace = glymur.core.SRGB
         approx = -1
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        with self.assertWarnsRegex(UserWarning, 'Invalid approximation'):
             glymur.jp2box.ColourSpecificationBox(colorspace=colorspace,
                                                  approximation=approx)
-            self.assertTrue(issubclass(w[0].category,UserWarning))
-            msg = 'Invalid approximation'
-            self.assertTrue(msg in str(w[0].message))
 
     def test_colr_with_bad_color(self):
         """colr must have a valid color, strange as though that may sound."""
@@ -542,24 +523,18 @@ class TestPaletteBox(unittest.TestCase):
         palette = np.array([[255, 0, 255], [0, 255, 0]], dtype=np.uint8)
         bps = (8, 8, 8)
         signed = (False, False)
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        with self.assertWarns(UserWarning):
             pclr = glymur.jp2box.PaletteBox(palette, bits_per_component=bps,
                                             signed=signed)
-            self.assertEqual(len(w), 1)
-            self.assertTrue(issubclass(w[0].category, UserWarning))
 
     def test_mismatched_signed_palette(self):
         """bitdepth and signed arguments must have equal length"""
         palette = np.array([[255, 0, 255], [0, 255, 0]], dtype=np.uint8)
         bps = (8, 8, 8, 8)
         signed = (False, False, False, False)
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        with self.assertWarns(UserWarning):
             pclr = glymur.jp2box.PaletteBox(palette, bits_per_component=bps,
                                             signed=signed)
-            self.assertEqual(len(w), 1)
-            self.assertTrue(issubclass(w[0].category, UserWarning))
 
     def test_writing_with_different_bitdepths(self):
         """Bitdepths must be the same when writing."""
diff --git a/glymur/test/test_jp2box_jpx.py b/glymur/test/test_jp2box_jpx.py
index 3a5d42e..421496f 100644
--- a/glymur/test/test_jp2box_jpx.py
+++ b/glymur/test/test_jp2box_jpx.py
@@ -9,7 +9,6 @@ import struct
 import sys
 import tempfile
 import unittest
-import warnings
 
 import lxml.etree as ET
 
@@ -311,11 +310,8 @@ class TestJPXWrap(unittest.TestCase):
         boxes = [jp2.box[idx] for idx in [0, 1, 2, 4]]
 
         ftyp = glymur.jp2box.FileTypeBox()
-        with warnings.catch_warnings(record=True) as w:
-            warnings.simplefilter('always')
+        with self.assertWarns(UserWarning):
             dref = glymur.jp2box.DataReferenceBox([ftyp])
-            self.assertEqual(len(w), 1)
-            self.assertTrue(issubclass(w[0].category, UserWarning))
 
         # Try to get around it by appending the ftyp box after creation.
         dref = glymur.jp2box.DataReferenceBox()
@@ -438,8 +434,7 @@ class TestJPX(unittest.TestCase):
         offset = [89]
         length = [1132288]
         reference = [0, 0]
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             flst = glymur.jp2box.FragmentListBox(offset, length, reference)
         with self.assertRaises(IOError):
             with tempfile.TemporaryFile() as tfile:
@@ -450,8 +445,7 @@ class TestJPX(unittest.TestCase):
         offset = [0]
         length = [1132288]
         reference = [0]
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             flst = glymur.jp2box.FragmentListBox(offset, length, reference)
         with self.assertRaises((IOError, OSError)):
             with tempfile.TemporaryFile() as tfile:
@@ -462,8 +456,7 @@ class TestJPX(unittest.TestCase):
         offset = [89]
         length = [0]
         reference = [0]
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             flst = glymur.jp2box.FragmentListBox(offset, length, reference)
         with self.assertRaises(IOError):
             with tempfile.TemporaryFile() as tfile:
@@ -471,9 +464,7 @@ class TestJPX(unittest.TestCase):
 
     def test_ftbl_boxes_empty(self):
         """A fragment table box must have at least one child box."""
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
-            ftbl = glymur.jp2box.FragmentTableBox()
+        ftbl = glymur.jp2box.FragmentTableBox()
         with self.assertRaises(IOError):
             with tempfile.TemporaryFile() as tfile:
                 ftbl.write(tfile)
diff --git a/glymur/test/test_jp2box_uuid.py b/glymur/test/test_jp2box_uuid.py
index 44808bb..9ff138f 100644
--- a/glymur/test/test_jp2box_uuid.py
+++ b/glymur/test/test_jp2box_uuid.py
@@ -17,7 +17,6 @@ import struct
 import sys
 import tempfile
 import uuid
-import warnings
 
 if sys.hexversion < 0x02070000:
     import unittest2 as unittest
@@ -107,12 +106,8 @@ class TestUUIDExif(unittest.TestCase):
             tfile.write(struct.pack('<HHI4s', 171, 2, 3, b'HTC\x00'))
             tfile.flush()
 
-            with warnings.catch_warnings(record=True) as w:
-                warnings.simplefilter('always')
+            with self.assertWarnsRegex(UserWarning, 'Unrecognized Exif tag'):
                 j = glymur.Jp2k(tfile.name)
-                self.assertTrue(issubclass(w[0].category, UserWarning))
-                msg = 'Unrecognized Exif tag'
-                self.assertTrue(msg in str(w[0].message))
 
     def test_bad_tag_datatype(self):
         """Only certain datatypes are allowable"""
@@ -136,12 +131,8 @@ class TestUUIDExif(unittest.TestCase):
             tfile.write(struct.pack('<HHI4s', 271, 2000, 3, b'HTC\x00'))
             tfile.flush()
 
-            with warnings.catch_warnings(record=True) as w:
-                warnings.simplefilter('always')
+            with self.assertWarnsRegex(UserWarning, 'Invalid TIFF tag'):
                 j = glymur.Jp2k(tfile.name)
-                self.assertTrue(issubclass(w[0].category, UserWarning))
-                msg = 'Invalid TIFF tag'
-                self.assertTrue(msg in str(w[0].message))
 
             self.assertEqual(j.box[-1].box_id, 'uuid')
 
@@ -167,20 +158,11 @@ class TestUUIDExif(unittest.TestCase):
             tfile.write(struct.pack('<HHI4s', 271, 2, 3, b'HTC\x00'))
             tfile.flush()
 
-            with warnings.catch_warnings(record=True) as w:
-                warnings.simplefilter('always')
-                j = glymur.Jp2k(tfile.name)
-                self.assertTrue(issubclass(w[0].category, UserWarning))
-                msg = 'The byte order indication in the TIFF header '
-                if sys.hexversion < 0x03000000:
-                    msg += "(JI) is invalid.  "
-                    msg += "It should be either [73, 73] or [77, 77]."
-                else:
-                    msg += "(b'JI') is invalid.  "
-                    msg += "It should be either b'II' or b'MM'."
-                self.assertTrue(msg in str(w[0].message))
+            regex = 'The byte order indication in the TIFF header '
+            with self.assertWarnsRegex(UserWarning, regex):
+                jp2 = glymur.Jp2k(tfile.name)
 
-            self.assertEqual(j.box[-1].box_id, 'uuid')
+            self.assertEqual(jp2.box[-1].box_id, 'uuid')
 
     def test_big_endian(self):
         """Verify read of big-endian IFD."""
diff --git a/glymur/test/test_jp2box_xml.py b/glymur/test/test_jp2box_xml.py
index f0bfb35..0238141 100644
--- a/glymur/test/test_jp2box_xml.py
+++ b/glymur/test/test_jp2box_xml.py
@@ -20,7 +20,6 @@ import struct
 import sys
 import tempfile
 import unittest
-import warnings
 
 if sys.hexversion < 0x03000000:
     from StringIO import StringIO
@@ -269,8 +268,7 @@ class TestBadButRecoverableXmlFile(unittest.TestCase):
 
     def test_recover_from_bad_xml(self):
         """Should be able to recover info from xml box with bad xml."""
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             jp2 = Jp2k(self._bad_xml_file)
 
         self.assertEqual(jp2.box[3].box_id, 'xml ')
diff --git a/glymur/test/test_jp2k.py b/glymur/test/test_jp2k.py
index f8dbd22..e74cedc 100644
--- a/glymur/test/test_jp2k.py
+++ b/glymur/test/test_jp2k.py
@@ -21,8 +21,6 @@ import unittest
 import uuid
 from xml.etree import cElementTree as ET
 
-import warnings
-
 import numpy as np
 import pkg_resources
 
@@ -1044,8 +1042,7 @@ class TestJp2k_2_1(unittest.TestCase):
                 tfile.write(data[offset+59:])
                 #tfile.write(data[3186:])
                 tfile.flush()
-                with warnings.catch_warnings():
-                    warnings.simplefilter("ignore")
+                with self.assertWarns(UserWarning):
                     j = Jp2k(tfile.name)
                 regexp = re.compile(r'''OpenJPEG\slibrary\serror:\s+
                                         Invalid\svalues\sfor\scomp\s=\s0\s+
@@ -1074,9 +1071,7 @@ class TestParsing(unittest.TestCase):
         """Should not warn if RSIZ when parsing is turned off."""
         filename = opj_data_file('input/nonregression/edf_c2_1002767.jp2')
         glymur.set_parseoptions(codestream=False)
-        with warnings.catch_warnings(record=True) as w:
-            j = Jp2k(filename)
-            self.assertEqual(len(w), 0)
+        j = Jp2k(filename)
 
         glymur.set_parseoptions(codestream=True)
         with self.assertWarnsRegex(UserWarning, 'Invalid profile'):
@@ -1194,9 +1189,8 @@ class TestJp2kOpjDataRoot(unittest.TestCase):
         # This file has the components physically reversed.  The cmap box
         # tells the decoder how to order them, but this flag prevents that.
         filename = opj_data_file('input/conformance/file2.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # The file has a bad compatibility list entry.  Not important here.
-            warnings.simplefilter("ignore")
             j = Jp2k(filename)
         ycbcr = j.read()
         crcby = j.read(ignore_pclr_cmap_cdef=True)
diff --git a/glymur/test/test_opj_suite.py b/glymur/test/test_opj_suite.py
index f9f683b..f5e0221 100644
--- a/glymur/test/test_opj_suite.py
+++ b/glymur/test/test_opj_suite.py
@@ -31,8 +31,6 @@ import re
 import sys
 import unittest
 
-import warnings
-
 import numpy as np
 
 from glymur import Jp2k
@@ -206,16 +204,16 @@ class TestSuite(unittest.TestCase):
 
     def test_ETS_JP2_file1(self):
         jfile = opj_data_file('input/conformance/file1.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Bad compatibility list item.
-            warnings.simplefilter("ignore")
             jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (512, 768, 3))
 
     def test_ETS_JP2_file2(self):
         jfile = opj_data_file('input/conformance/file2.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (640, 480, 3))
 
@@ -223,7 +221,8 @@ class TestSuite(unittest.TestCase):
                      "Functionality not implemented for 1.x")
     def test_ETS_JP2_file3(self):
         jfile = opj_data_file('input/conformance/file3.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read_bands()
         self.assertEqual(jpdata[0].shape, (640, 480))
         self.assertEqual(jpdata[1].shape, (320, 240))
@@ -231,50 +230,53 @@ class TestSuite(unittest.TestCase):
 
     def test_ETS_JP2_file4(self):
         jfile = opj_data_file('input/conformance/file4.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (512, 768))
 
     def test_ETS_JP2_file5(self):
         jfile = opj_data_file('input/conformance/file5.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # There's a warning for an unknown compatibility entry.
             # Ignore it here.
-            warnings.simplefilter("ignore")
             jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (512, 768, 3))
 
     def test_ETS_JP2_file6(self):
         jfile = opj_data_file('input/conformance/file6.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (512, 768))
 
     def test_ETS_JP2_file7(self):
         jfile = opj_data_file('input/conformance/file7.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (640, 480, 3))
 
     def test_ETS_JP2_file8(self):
         jfile = opj_data_file('input/conformance/file8.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (400, 700))
 
     def test_ETS_JP2_file9(self):
         jfile = opj_data_file('input/conformance/file9.jp2')
-        jp2k = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2k = Jp2k(jfile)
         jpdata = jp2k.read()
         self.assertEqual(jpdata.shape, (512, 768, 3))
 
     def test_NR_broken_jp2_dump(self):
         jfile = opj_data_file('input/nonregression/broken.jp2')
 
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # colr box has bad length.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
@@ -476,15 +478,15 @@ class TestSuite(unittest.TestCase):
 
     def test_NR_DEC_orb_blue_lin_jp2_25_decode(self):
         jfile = opj_data_file('input/nonregression/orb-blue10-lin-jp2.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # This file has an invalid ICC profile
-            warnings.simplefilter("ignore")
             Jp2k(jfile).read()
         self.assertTrue(True)
 
     def test_NR_DEC_orb_blue_win_jp2_26_decode(self):
         jfile = opj_data_file('input/nonregression/orb-blue10-win-jp2.jp2')
-        Jp2k(jfile).read()
+        with self.assertWarns(UserWarning):
+            Jp2k(jfile).read()
         self.assertTrue(True)
 
     def test_NR_DEC_relax_jp2_27_decode(self):
@@ -634,18 +636,16 @@ class TestSuite2point0(unittest.TestCase):
         # Null pointer access
         jfile = opj_data_file('input/nonregression/broken2.jp2')
         with self.assertRaises(IOError):
-            with warnings.catch_warnings():
+            with self.assertWarns(UserWarning):
                 # Invalid marker ID.
-                warnings.simplefilter("ignore")
                 Jp2k(jfile).read()
         self.assertTrue(True)
 
     def test_NR_DEC_broken4_jp2_7_decode(self):
         jfile = opj_data_file('input/nonregression/broken4.jp2')
         with self.assertRaises(IOError):
-            with warnings.catch_warnings():
+            with self.assertWarns(UserWarning):
                 # invalid number of subbands, bad marker ID
-                warnings.simplefilter("ignore")
                 Jp2k(jfile).read()
         self.assertTrue(True)
 
@@ -655,9 +655,8 @@ class TestSuite2point0(unittest.TestCase):
         relpath = 'input/nonregression/kakadu_v4-4_openjpegv2_broken.j2k'
         jfile = opj_data_file(relpath)
         if glymur.version.openjpeg_version_tuple[0] < 2:
-            with warnings.catch_warnings():
+            with self.assertWarns(UserWarning):
                 # Incorrect warning issued about tile parts.
-                warnings.simplefilter("ignore")
                 Jp2k(jfile).read()
         else:
             Jp2k(jfile).read()
diff --git a/glymur/test/test_opj_suite_2p1.py b/glymur/test/test_opj_suite_2p1.py
index 1b58d77..cc7a5ff 100644
--- a/glymur/test/test_opj_suite_2p1.py
+++ b/glymur/test/test_opj_suite_2p1.py
@@ -31,8 +31,6 @@ import re
 import sys
 import unittest
 
-import warnings
-
 import numpy as np
 
 from glymur import Jp2k
@@ -58,9 +56,8 @@ class TestSuite2point1(unittest.TestCase):
 
     def test_NR_DEC_text_GBR_jp2_29_decode(self):
         jfile = opj_data_file('input/nonregression/text_GBR.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # brand is 'jp2 ', but has any icc profile.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
         jp2.read()
         self.assertTrue(True)
@@ -88,9 +85,8 @@ class TestSuite2point1(unittest.TestCase):
     def test_NR_DEC_gdal_fuzzer_unchecked_num_resolutions_jp2_36_decode(self):
         f = 'input/nonregression/gdal_fuzzer_unchecked_numresolutions.jp2'
         jfile = opj_data_file(f)
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Invalid number of resolutions.
-            warnings.simplefilter("ignore")
             j = Jp2k(jfile)
             with self.assertRaises(IOError):
                 j.read()
@@ -98,9 +94,8 @@ class TestSuite2point1(unittest.TestCase):
     def test_NR_DEC_gdal_fuzzer_check_number_of_tiles_jp2_38_decode(self):
         relpath = 'input/nonregression/gdal_fuzzer_check_number_of_tiles.jp2'
         jfile = opj_data_file(relpath)
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Invalid number of tiles.
-            warnings.simplefilter("ignore")
             j = Jp2k(jfile)
             with self.assertRaises(IOError):
                 j.read()
@@ -108,9 +103,8 @@ class TestSuite2point1(unittest.TestCase):
     def test_NR_DEC_gdal_fuzzer_check_comp_dx_dy_jp2_39_decode(self):
         relpath = 'input/nonregression/gdal_fuzzer_check_comp_dx_dy.jp2'
         jfile = opj_data_file(relpath)
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Invalid subsampling value
-            warnings.simplefilter("ignore")
             with self.assertRaises(IOError):
                 Jp2k(jfile).read()
 
@@ -157,9 +151,8 @@ class TestSuite2point1(unittest.TestCase):
                'nonregression',
                'gdal_fuzzer_assert_in_opj_j2k_read_SQcd_SQcc.patch.jp2')
         jfile = opj_data_file('/'.join(lst))
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Invalid component number.
-            warnings.simplefilter("ignore")
             j = Jp2k(jfile)
             with self.assertRaises(IOError):
                 j.read()
diff --git a/glymur/test/test_opj_suite_dump.py b/glymur/test/test_opj_suite_dump.py
index 705786b..a2a234d 100644
--- a/glymur/test/test_opj_suite_dump.py
+++ b/glymur/test/test_opj_suite_dump.py
@@ -31,8 +31,6 @@ import re
 import sys
 import unittest
 
-import warnings
-
 import numpy as np
 
 from glymur import Jp2k
@@ -44,7 +42,7 @@ from .fixtures import mse, peak_tolerance, read_pgx, opj_data_file
 
 @unittest.skipIf(OPJ_DATA_ROOT is None,
                  "OPJ_DATA_ROOT environment variable not set")
-class TestSuiteDump(unittest.TestCase):
+class TestSuite(unittest.TestCase):
 
     def setUp(self):
         pass
@@ -112,8 +110,7 @@ class TestSuiteDump(unittest.TestCase):
         """
         relpath = 'input/nonregression/issue188_beach_64bitsbox.jp2'
         jfile = opj_data_file(relpath)
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             j = Jp2k(jfile)
         d = j.read()
         self.assertTrue(True)
@@ -121,8 +118,7 @@ class TestSuiteDump(unittest.TestCase):
 
     def test_NR_broken4_jp2_dump(self):
         jfile = opj_data_file('input/nonregression/broken4.jp2')
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             jp2 = Jp2k(jfile)
 
         self.assertEqual(jp2.box[-1].main_header.segment[-1].marker_id, 'QCC')
@@ -136,9 +132,8 @@ class TestSuiteDump(unittest.TestCase):
         length of over 1GB.  Don't run it on 32-bit platforms.
         """
         jfile = opj_data_file('input/nonregression/broken3.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Bad box length.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
@@ -232,9 +227,8 @@ class TestSuiteDump(unittest.TestCase):
         Invalid marker ID in the codestream.
         """
         jfile = opj_data_file('input/nonregression/broken2.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Invalid marker ID on codestream.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
         
         self.assertEqual(jp2.box[-1].main_header.segment[-1].marker_id, 'QCC')
@@ -2467,9 +2461,8 @@ class TestSuiteDump(unittest.TestCase):
 
     def test_NR_file1_dump(self):
         jfile = opj_data_file('input/conformance/file1.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Bad compatibility list item.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
@@ -2503,7 +2496,8 @@ class TestSuiteDump(unittest.TestCase):
 
     def test_NR_file2_dump(self):
         jfile = opj_data_file('input/conformance/file2.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'jp2h', 'jp2c'])
@@ -2533,7 +2527,8 @@ class TestSuiteDump(unittest.TestCase):
         # vertical directions. The components are stored in the standard
         # order.
         jfile = opj_data_file('input/conformance/file3.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'jp2h', 'jp2c'])
@@ -2564,7 +2559,8 @@ class TestSuiteDump(unittest.TestCase):
     def test_NR_file4_dump(self):
         # One 8-bit component in the sRGB-grey colourspace.
         jfile = opj_data_file('input/conformance/file4.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'jp2h', 'jp2c'])
@@ -2589,10 +2585,9 @@ class TestSuiteDump(unittest.TestCase):
         # profile and using the JPX-defined enumerated code for the ROMM-RGB
         # colourspace.
         jfile = opj_data_file('input/conformance/file5.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # There's a warning for an unknown compatibility entry.
             # Ignore it here.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
@@ -2615,7 +2610,8 @@ class TestSuiteDump(unittest.TestCase):
 
     def test_NR_file6_dump(self):
         jfile = opj_data_file('input/conformance/file6.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'jp2h', 'jp2c'])
@@ -2642,7 +2638,8 @@ class TestSuiteDump(unittest.TestCase):
         # profile and using the JPX-defined enumerated code for the e-sRGB
         # colourspace.
         jfile = opj_data_file('input/conformance/file7.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'rreq', 'jp2h', 'jp2c'])
@@ -2670,7 +2667,8 @@ class TestSuiteDump(unittest.TestCase):
         # One 8-bit component in a gamma 1.8 space. The colourspace is
         # specified using a Restricted ICC profile.
         jfile = opj_data_file('input/conformance/file8.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'jp2h', 'xml ', 'jp2c',
@@ -2712,7 +2710,8 @@ class TestSuiteDump(unittest.TestCase):
     def test_NR_file9_dump(self):
         # Colormap
         jfile = opj_data_file('input/conformance/file9.jp2')
-        jp2 = Jp2k(jfile)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
         self.assertEqual(ids, ['jP  ', 'ftyp', 'jp2h', 'jp2c'])
@@ -3955,9 +3954,8 @@ class TestSuiteDump(unittest.TestCase):
     def test_NR_issue188_beach_64bitsbox(self):
         lst = ['input', 'nonregression', 'issue188_beach_64bitsbox.jp2']
         jfile = opj_data_file('/'.join(lst))
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # There's a warning for an unknown box.  
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
@@ -4350,9 +4348,8 @@ class TestSuiteDump(unittest.TestCase):
 
     def test_NR_orb_blue10_lin_jp2_dump(self):
         jfile = opj_data_file('input/nonregression/orb-blue10-lin-jp2.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # This file has an invalid ICC profile
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
@@ -4426,9 +4423,8 @@ class TestSuiteDump(unittest.TestCase):
 
     def test_NR_orb_blue10_win_jp2_dump(self):
         jfile = opj_data_file('input/nonregression/orb-blue10-win-jp2.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # This file has an invalid ICC profile
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
 
         ids = [box.box_id for box in jp2.box]
diff --git a/glymur/test/test_opj_suite_neg.py b/glymur/test/test_opj_suite_neg.py
index bee06f7..4ee7052 100644
--- a/glymur/test/test_opj_suite_neg.py
+++ b/glymur/test/test_opj_suite_neg.py
@@ -13,7 +13,6 @@ import re
 import sys
 import tempfile
 import unittest
-import warnings
 
 import numpy as np
 try:
@@ -81,8 +80,7 @@ class TestSuiteNegative(unittest.TestCase):
         relpath = 'input/nonregression/illegalcolortransform.j2k'
         jfile = opj_data_file(relpath)
         jp2k = Jp2k(jfile)
-        with warnings.catch_warnings():
-            warnings.simplefilter('ignore')
+        with self.assertWarns(UserWarning):
             codestream = jp2k.get_codestream(header_only=False)
 
         # Verify that the last segment returned in the codestream is SOD,
diff --git a/glymur/test/test_opj_suite_write.py b/glymur/test/test_opj_suite_write.py
index 2af76d8..f58fd1f 100644
--- a/glymur/test/test_opj_suite_write.py
+++ b/glymur/test/test_opj_suite_write.py
@@ -11,7 +11,6 @@ import re
 import sys
 import tempfile
 import unittest
-import warnings
 
 import numpy as np
 try:
@@ -157,10 +156,7 @@ class TestSuiteWriteCinema(unittest.TestCase):
         data = skimage.io.imread(infile)
         with tempfile.NamedTemporaryFile(suffix='.j2k') as tfile:
             j = Jp2k(tfile.name, 'wb')
-            with warnings.catch_warnings():
-                # Just turn off warnings.
-                warnings.simplefilter("ignore")
-                j.write(data, cinema4k=True)
+            j.write(data, cinema4k=True)
 
             codestream = j.get_codestream()
             self.check_cinema4k_codestream(codestream, (4096, 2160))
@@ -220,10 +216,7 @@ class TestSuiteWriteCinema(unittest.TestCase):
         data = skimage.io.imread(infile)
         with tempfile.NamedTemporaryFile(suffix='.j2k') as tfile:
             j = Jp2k(tfile.name, 'wb')
-            with warnings.catch_warnings():
-                # Just turn off warnings.
-                warnings.simplefilter("ignore")
-                j.write(data, cinema2k=48)
+            j.write(data, cinema2k=48)
 
             codestream = j.get_codestream()
             self.check_cinema2k_codestream(codestream, (1998, 1080))
diff --git a/glymur/test/test_printing.py b/glymur/test/test_printing.py
index da2062e..c789f2e 100644
--- a/glymur/test/test_printing.py
+++ b/glymur/test/test_printing.py
@@ -15,7 +15,6 @@ import re
 import struct
 import sys
 import tempfile
-import warnings
 import unittest
 
 if sys.hexversion < 0x03000000:
@@ -87,9 +86,7 @@ class TestPrinting(unittest.TestCase):
             tfile.write(write_buffer)
             tfile.flush()
 
-            with warnings.catch_warnings():
-                # Suppress the warning about the unrecognized box.
-                warnings.simplefilter("ignore")
+            with self.assertWarns(UserWarning):
                 jpx = Jp2k(tfile.name)
 
             glymur.set_printoptions(short=True)
@@ -648,10 +645,7 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_invalid_colorspace(self):
         """An invalid colorspace shouldn't cause an error."""
         filename = opj_data_file('input/nonregression/edf_c2_1103421.jp2')
-        with warnings.catch_warnings():
-            # Bad compatibility list item and bad colorspace warnings.  Just
-            # suppress the warnings.
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             jp2 = Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(jp2)
@@ -659,8 +653,7 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_bad_rsiz(self):
         """Should still be able to print if rsiz is bad, issue196"""
         filename = opj_data_file('input/nonregression/edf_c2_1002767.jp2')
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             j = Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j)
@@ -668,8 +661,7 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_bad_wavelet_transform(self):
         """Should still be able to print if wavelet xform is bad, issue195"""
         filename = opj_data_file('input/nonregression/edf_c2_10025.jp2')
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             jp2 = Jp2k(filename)
             with patch('sys.stdout', new=StringIO()) as fake_out:
                 print(jp2)
@@ -677,9 +669,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_invalid_progression_order(self):
         """Should still be able to print even if prog order is invalid."""
         jfile = opj_data_file('input/nonregression/2977.pdf.asan.67.2198.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Multiple warnings, actually.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(jfile)
             codestream = jp2.get_codestream()
         with patch('sys.stdout', new=StringIO()) as fake_out:
@@ -839,7 +830,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_xml(self):
         """verify printing of XML box"""
         filename = opj_data_file('input/conformance/file1.jp2')
-        j = glymur.Jp2k(filename)
+        with self.assertWarns(UserWarning):
+            j = glymur.Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j.box[2])
             actual = fake_out.getvalue().strip()
@@ -848,9 +840,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_channel_definition(self):
         """verify printing of cdef box"""
         filename = opj_data_file('input/conformance/file2.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Bad compatibility list item.
-            warnings.simplefilter("ignore")
             j = glymur.Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j.box[2].box[2])
@@ -865,7 +856,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_component_mapping(self):
         """verify printing of cmap box"""
         filename = opj_data_file('input/conformance/file9.jp2')
-        j = glymur.Jp2k(filename)
+        with self.assertWarns(UserWarning):
+            j = glymur.Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j.box[2].box[2])
             actual = fake_out.getvalue().strip()
@@ -890,7 +882,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_palette7(self):
         """verify printing of pclr box"""
         filename = opj_data_file('input/conformance/file9.jp2')
-        j = glymur.Jp2k(filename)
+        with self.assertWarns(UserWarning):
+            j = glymur.Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j.box[2].box[1])
             actual = fake_out.getvalue().strip()
@@ -902,7 +895,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_rreq(self):
         """verify printing of reader requirements box"""
         filename = opj_data_file('input/nonregression/text_GBR.jp2')
-        j = glymur.Jp2k(filename)
+        with self.assertWarns(UserWarning):
+            j = glymur.Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j.box[2])
             actual = fake_out.getvalue().strip()
@@ -932,7 +926,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_palette_box(self):
         """Verify that palette (pclr) boxes are printed without error."""
         filename = opj_data_file('input/conformance/file9.jp2')
-        j = glymur.Jp2k(filename)
+        with self.assertWarns(UserWarning):
+            j = glymur.Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(j.box[2].box[1])
             actual = fake_out.getvalue().strip()
@@ -946,9 +941,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
         # ICC profiles may be used in JP2, but the approximation field should
         # be zero unless we have jpx.  This file does both.
         filename = opj_data_file('input/nonregression/text_GBR.jp2')
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # brand is 'jp2 ', but has any icc profile.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(filename)
 
         with patch('sys.stdout', new=StringIO()) as fake_out:
@@ -966,7 +960,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_uuid(self):
         """verify printing of UUID box"""
         filename = opj_data_file('input/nonregression/text_GBR.jp2')
-        jp2 = Jp2k(filename)
+        with self.assertWarns(UserWarning):
+            jp2 = Jp2k(filename)
 
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(jp2.box[4])
@@ -984,9 +979,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
         # Format strings like %d were showing up in the output.
         filename = opj_data_file('input/nonregression/mem-b2ace68c-1381.jp2')
 
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Ignore warning about bad pclr box.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(jp2.box[3].box[3])
@@ -996,9 +990,8 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
     def test_issue183(self):
         filename = opj_data_file('input/nonregression/orb-blue10-lin-jp2.jp2')
 
-        with warnings.catch_warnings():
+        with self.assertWarns(UserWarning):
             # Ignore warning about bad pclr box.
-            warnings.simplefilter("ignore")
             jp2 = Jp2k(filename)
         with patch('sys.stdout', new=StringIO()) as fake_out:
             print(jp2.box[2].box[1])
@@ -1010,8 +1003,7 @@ class TestPrintingOpjDataRoot(unittest.TestCase):
         filename = opj_data_file(os.path.join('input',
                                               'nonregression',
                                               'issue171.jp2'))
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with self.assertWarns(UserWarning):
             jp2 = Jp2k(filename)
             with patch('sys.stdout', new=StringIO()) as fake_out:
                 # No need to verify, it's enough that we don't error out.