diff --git a/tests/test_plot/plots.xml b/tests/test_plot/plots.xml
index e8848f6172..d5e03f598f 100644
--- a/tests/test_plot/plots.xml
+++ b/tests/test_plot/plots.xml
@@ -23,4 +23,10 @@
     <background>0 0 0</background>
   </plot>
 
+  <plot id="4" type="voxel">
+    <pixels>100 100 10</pixels>
+    <origin>0. 0. 0.</origin>
+    <width>20 20 10</width>
+  </plot>
+
 </plots>
diff --git a/tests/test_plot/results_true.dat b/tests/test_plot/results_true.dat
index 910e41a060..ba8a49226a 100644
--- a/tests/test_plot/results_true.dat
+++ b/tests/test_plot/results_true.dat
@@ -1 +1 @@
-f76183da6a581c17f9a1572e1f1573d784e3f2e3efa3e7a3bd8786991df7a086e0b5f7f1c6b00343fa61b601ec70ad619b5ff5d8120af32559b882ca57be6768
\ No newline at end of file
+01ecda0f3820a49c8a41d8dc47d1e5c58767a04301621c2437231fcc04401ddea47b67d0529ca56a32d4d97b4f1416a2e0b6120d3bdc87d74a7e9889758a8808
\ No newline at end of file
diff --git a/tests/test_plot/test_plot.py b/tests/test_plot/test_plot.py
index d45479e256..62cea67df4 100644
--- a/tests/test_plot/test_plot.py
+++ b/tests/test_plot/test_plot.py
@@ -1,11 +1,71 @@
 #!/usr/bin/env python
 
+import glob
+import hashlib
 import os
 import sys
 sys.path.insert(0, os.pardir)
-from testing_harness import PlotTestHarness
+from testing_harness import TestHarness
+
+import h5py
+
+from openmc import Executor
+
+
+class PlotTestHarness(TestHarness):
+    """Specialized TestHarness for running OpenMC plotting tests."""
+    def __init__(self, plot_names):
+        super(PlotTestHarness, self).__init__(None, False)
+        self._plot_names = plot_names
+
+    def _run_openmc(self):
+        executor = Executor()
+        returncode = executor.plot_geometry(openmc_exec=self._opts.exe)
+        assert returncode == 0, 'OpenMC did not exit successfully.'
+
+    def _test_output_created(self):
+        """Make sure *.ppm has been created."""
+        for fname in self._plot_names:
+            assert os.path.exists(os.path.join(os.getcwd(), fname)), \
+                 'Plot output file does not exist.'
+
+    def _cleanup(self):
+        super(PlotTestHarness, self)._cleanup()
+        for fname in self._plot_names:
+            path = os.path.join(os.getcwd(), fname)
+            if os.path.exists(path):
+                #os.remove(path)
+                pass
+
+    def _get_results(self):
+        """Return a string hash of the plot files."""
+        outstr = bytes()
+
+        # Add PPM output to results
+        ppm_files = glob.glob(os.path.join(os.getcwd(), '*.ppm'))
+        for fname in sorted(ppm_files):
+            with open(fname, 'rb') as fh:
+                outstr += fh.read()
+
+        # Add voxel data to results
+        voxel_files = glob.glob(os.path.join(os.getcwd(), '*.voxel'))
+        for fname in sorted(voxel_files):
+            with h5py.File(fname, 'r') as fh:
+                outstr += fh['filetype'].value
+                outstr += fh['num_voxels'].value.tobytes()
+                outstr += fh['lower_left'].value.tobytes()
+                outstr += fh['voxel_width'].value.tobytes()
+                outstr += fh['data'].value.tobytes()
+
+        # Hash the information and return.
+        sha512 = hashlib.sha512()
+        sha512.update(outstr)
+        outstr = sha512.hexdigest()
+
+        return outstr
 
 
 if __name__ == '__main__':
-    harness = PlotTestHarness(('1_plot.ppm', '2_plot.ppm', '3_plot.ppm'))
+    harness = PlotTestHarness(('1_plot.ppm', '2_plot.ppm', '3_plot.ppm',
+                               '4_plot.voxel'))
     harness.main()
diff --git a/tests/testing_harness.py b/tests/testing_harness.py
index 190c702282..66cadfe633 100644
--- a/tests/testing_harness.py
+++ b/tests/testing_harness.py
@@ -152,49 +152,6 @@ class HashedTestHarness(TestHarness):
         return super(HashedTestHarness, self)._get_results(True)
 
 
-class PlotTestHarness(TestHarness):
-    """Specialized TestHarness for running OpenMC plotting tests."""
-    def __init__(self, plot_names):
-        super(PlotTestHarness, self).__init__(None, False)
-        self._plot_names = plot_names
-
-    def _run_openmc(self):
-        executor = Executor()
-        returncode = executor.plot_geometry(openmc_exec=self._opts.exe)
-        assert returncode == 0, 'OpenMC did not exit successfully.'
-
-    def _test_output_created(self):
-        """Make sure *.ppm has been created."""
-        for fname in self._plot_names:
-            assert os.path.exists(os.path.join(os.getcwd(), fname)), \
-                 'Plot output file does not exist.'
-
-    def _cleanup(self):
-        super(PlotTestHarness, self)._cleanup()
-        output = glob.glob(os.path.join(os.getcwd(), '*.ppm'))
-        for f in output:
-            if os.path.exists(f):
-                os.remove(f)
-
-    def _get_results(self):
-        """Return a string hash of the plot files."""
-        # Find the plot files.
-        plot_files = glob.glob(os.path.join(os.getcwd(), '*.ppm'))
-
-        # Read the plot files.
-        outstr = bytes()
-        for fname in sorted(plot_files):
-            with open(fname, 'rb') as fh:
-                outstr += fh.read()
-
-        # Hash the information and return.
-        sha512 = hashlib.sha512()
-        sha512.update(outstr)
-        outstr = sha512.hexdigest()
-
-        return outstr
-
-
 class CMFDTestHarness(TestHarness):
     """Specialized TestHarness for running OpenMC CMFD tests."""
     def _get_results(self):