diff --git a/tests/regression_tests/asymmetric_lattice/inputs_true.dat b/tests/regression_tests/asymmetric_lattice/inputs_true.dat
index 672f6bee12..bbdc79715b 100644
--- a/tests/regression_tests/asymmetric_lattice/inputs_true.dat
+++ b/tests/regression_tests/asymmetric_lattice/inputs_true.dat
@@ -56,7 +56,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/create_fission_neutrons/inputs_true.dat b/tests/regression_tests/create_fission_neutrons/inputs_true.dat
index 9aeabbb57b..b0ca896476 100644
--- a/tests/regression_tests/create_fission_neutrons/inputs_true.dat
+++ b/tests/regression_tests/create_fission_neutrons/inputs_true.dat
@@ -10,7 +10,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="mat">
+  <material depletable="true" id="1" name="mat">
     <density units="atom/b-cm" value="0.069335" />
     <nuclide ao="40.0" name="H1" />
     <nuclide ao="1.0" name="U235" />
diff --git a/tests/regression_tests/diff_tally/inputs_true.dat b/tests/regression_tests/diff_tally/inputs_true.dat
index ff134bd5c3..909475f962 100644
--- a/tests/regression_tests/diff_tally/inputs_true.dat
+++ b/tests/regression_tests/diff_tally/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/distribmat/inputs_true.dat b/tests/regression_tests/distribmat/inputs_true.dat
index 85d35b0810..39e611e16a 100644
--- a/tests/regression_tests/distribmat/inputs_true.dat
+++ b/tests/regression_tests/distribmat/inputs_true.dat
@@ -26,11 +26,11 @@
     <nuclide ao="2.0" name="H1" />
     <nuclide ao="1.0" name="O16" />
   </material>
-  <material id="2">
+  <material depletable="true" id="2">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
   </material>
-  <material id="3">
+  <material depletable="true" id="3">
     <density units="g/cc" value="2.0" />
     <nuclide ao="1.0" name="U235" />
   </material>
diff --git a/tests/regression_tests/filter_energyfun/inputs_true.dat b/tests/regression_tests/filter_energyfun/inputs_true.dat
index d857451cb0..418354fc2b 100644
--- a/tests/regression_tests/filter_energyfun/inputs_true.dat
+++ b/tests/regression_tests/filter_energyfun/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
@@ -156,7 +156,7 @@
     <nuclide ao="1.0801e-08" name="Xe135" />
     <nuclide ao="0.045737" name="O16" />
   </material>
-  <material id="2" name="Zircaloy">
+  <material depletable="true" id="2" name="Zircaloy">
     <density units="g/cm3" value="5.77" />
     <nuclide ao="0.5145" name="Zr90" />
     <nuclide ao="0.1122" name="Zr91" />
diff --git a/tests/regression_tests/filter_mesh/inputs_true.dat b/tests/regression_tests/filter_mesh/inputs_true.dat
index 6d14f9e7e3..ca063b7ce9 100644
--- a/tests/regression_tests/filter_mesh/inputs_true.dat
+++ b/tests/regression_tests/filter_mesh/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/fixed_source/inputs_true.dat b/tests/regression_tests/fixed_source/inputs_true.dat
index 2e0d57b0c1..f1aebb3b2b 100644
--- a/tests/regression_tests/fixed_source/inputs_true.dat
+++ b/tests/regression_tests/fixed_source/inputs_true.dat
@@ -5,7 +5,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1">
+  <material depletable="true" id="1">
     <density units="g/cc" value="7.5" />
     <nuclide ao="1.0" name="O16" />
     <nuclide ao="0.0001" name="U238" />
diff --git a/tests/regression_tests/iso_in_lab/inputs_true.dat b/tests/regression_tests/iso_in_lab/inputs_true.dat
index 9e30f245f9..2a302ada67 100644
--- a/tests/regression_tests/iso_in_lab/inputs_true.dat
+++ b/tests/regression_tests/iso_in_lab/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_ce_to_mg/inputs_true.dat b/tests/regression_tests/mgxs_library_ce_to_mg/inputs_true.dat
index 8e8cde2818..70996fe378 100644
--- a/tests/regression_tests/mgxs_library_ce_to_mg/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_ce_to_mg/inputs_true.dat
@@ -12,7 +12,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UO2 (2.4%)">
+  <material depletable="true" id="1" name="UO2 (2.4%)">
     <density units="g/cm3" value="10.29769" />
     <nuclide ao="4.4843e-06" name="U234" />
     <nuclide ao="0.00055815" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_condense/inputs_true.dat b/tests/regression_tests/mgxs_library_condense/inputs_true.dat
index d2f28d0fe0..ef6c4c5206 100644
--- a/tests/regression_tests/mgxs_library_condense/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_condense/inputs_true.dat
@@ -12,7 +12,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UO2 (2.4%)">
+  <material depletable="true" id="1" name="UO2 (2.4%)">
     <density units="g/cm3" value="10.29769" />
     <nuclide ao="4.4843e-06" name="U234" />
     <nuclide ao="0.00055815" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_distribcell/inputs_true.dat b/tests/regression_tests/mgxs_library_distribcell/inputs_true.dat
index d7a4a186ac..ba7dc05ff7 100644
--- a/tests/regression_tests/mgxs_library_distribcell/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_distribcell/inputs_true.dat
@@ -39,7 +39,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="Fuel">
+  <material depletable="true" id="1" name="Fuel">
     <density units="g/cm3" value="10.29769" />
     <nuclide ao="4.4843e-06" name="U234" />
     <nuclide ao="0.00055815" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_hdf5/inputs_true.dat b/tests/regression_tests/mgxs_library_hdf5/inputs_true.dat
index d2f28d0fe0..ef6c4c5206 100644
--- a/tests/regression_tests/mgxs_library_hdf5/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_hdf5/inputs_true.dat
@@ -12,7 +12,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UO2 (2.4%)">
+  <material depletable="true" id="1" name="UO2 (2.4%)">
     <density units="g/cm3" value="10.29769" />
     <nuclide ao="4.4843e-06" name="U234" />
     <nuclide ao="0.00055815" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_mesh/inputs_true.dat b/tests/regression_tests/mgxs_library_mesh/inputs_true.dat
index 4756b27bfb..aa2c904b19 100644
--- a/tests/regression_tests/mgxs_library_mesh/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_mesh/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_no_nuclides/inputs_true.dat b/tests/regression_tests/mgxs_library_no_nuclides/inputs_true.dat
index d2f28d0fe0..ef6c4c5206 100644
--- a/tests/regression_tests/mgxs_library_no_nuclides/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_no_nuclides/inputs_true.dat
@@ -12,7 +12,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UO2 (2.4%)">
+  <material depletable="true" id="1" name="UO2 (2.4%)">
     <density units="g/cm3" value="10.29769" />
     <nuclide ao="4.4843e-06" name="U234" />
     <nuclide ao="0.00055815" name="U235" />
diff --git a/tests/regression_tests/mgxs_library_nuclides/inputs_true.dat b/tests/regression_tests/mgxs_library_nuclides/inputs_true.dat
index 826eb5b623..b720bfcbba 100644
--- a/tests/regression_tests/mgxs_library_nuclides/inputs_true.dat
+++ b/tests/regression_tests/mgxs_library_nuclides/inputs_true.dat
@@ -12,7 +12,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UO2 (2.4%)">
+  <material depletable="true" id="1" name="UO2 (2.4%)">
     <density units="g/cm3" value="10.29769" />
     <nuclide ao="4.4843e-06" name="U234" />
     <nuclide ao="0.00055815" name="U235" />
diff --git a/tests/regression_tests/multipole/inputs_true.dat b/tests/regression_tests/multipole/inputs_true.dat
index 0d1fe99bdc..d1ef3e00aa 100644
--- a/tests/regression_tests/multipole/inputs_true.dat
+++ b/tests/regression_tests/multipole/inputs_true.dat
@@ -27,7 +27,7 @@
     <nuclide ao="1.0" name="O16" />
     <sab name="c_H_in_H2O" />
   </material>
-  <material id="2">
+  <material depletable="true" id="2">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
   </material>
diff --git a/tests/regression_tests/periodic/inputs_true.dat b/tests/regression_tests/periodic/inputs_true.dat
index 61958701b2..6f613a1602 100644
--- a/tests/regression_tests/periodic/inputs_true.dat
+++ b/tests/regression_tests/periodic/inputs_true.dat
@@ -18,7 +18,7 @@
     <nuclide ao="1.0" name="O16" />
     <sab name="c_H_in_H2O" />
   </material>
-  <material id="2">
+  <material depletable="true" id="2">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
   </material>
diff --git a/tests/regression_tests/resonance_scattering/inputs_true.dat b/tests/regression_tests/resonance_scattering/inputs_true.dat
index 70fe165fd5..2301ccf762 100644
--- a/tests/regression_tests/resonance_scattering/inputs_true.dat
+++ b/tests/regression_tests/resonance_scattering/inputs_true.dat
@@ -5,7 +5,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1">
+  <material depletable="true" id="1">
     <density units="g/cc" value="1.0" />
     <nuclide ao="1.0" name="U238" />
     <nuclide ao="0.02" name="U235" />
diff --git a/tests/regression_tests/salphabeta/inputs_true.dat b/tests/regression_tests/salphabeta/inputs_true.dat
index 02e6813f02..ede96d3769 100644
--- a/tests/regression_tests/salphabeta/inputs_true.dat
+++ b/tests/regression_tests/salphabeta/inputs_true.dat
@@ -12,19 +12,19 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1">
+  <material depletable="true" id="1">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
     <nuclide ao="1.0" name="H1" />
     <sab fraction="0.5" name="c_H_in_H2O" />
   </material>
-  <material id="2">
+  <material depletable="true" id="2">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
     <nuclide ao="1.0" name="C0" />
     <sab name="c_Graphite" />
   </material>
-  <material id="3">
+  <material depletable="true" id="3">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
     <nuclide ao="1.0" name="Be9" />
@@ -32,7 +32,7 @@
     <sab name="c_Be_in_BeO" />
     <sab name="c_O_in_BeO" />
   </material>
-  <material id="4">
+  <material depletable="true" id="4">
     <density units="g/cm3" value="5.90168" />
     <nuclide ao="0.3" name="H1" />
     <nuclide ao="0.15" name="Zr90" />
diff --git a/tests/regression_tests/source/inputs_true.dat b/tests/regression_tests/source/inputs_true.dat
index da230e0e50..6dd913edc0 100644
--- a/tests/regression_tests/source/inputs_true.dat
+++ b/tests/regression_tests/source/inputs_true.dat
@@ -5,7 +5,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1">
+  <material depletable="true" id="1">
     <temperature>294</temperature>
     <density units="g/cm3" value="4.5" />
     <nuclide ao="1.0" name="U235" />
diff --git a/tests/regression_tests/surface_tally/inputs_true.dat b/tests/regression_tests/surface_tally/inputs_true.dat
index e66d44273a..fc10110eee 100644
--- a/tests/regression_tests/surface_tally/inputs_true.dat
+++ b/tests/regression_tests/surface_tally/inputs_true.dat
@@ -11,7 +11,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="13" name="UO2 fuel at 2.4% wt enrichment">
+  <material depletable="true" id="13" name="UO2 fuel at 2.4% wt enrichment">
     <density units="g/cc" value="10.0" />
     <nuclide ao="1.0" name="U238" />
     <nuclide ao="0.02" name="U235" />
diff --git a/tests/regression_tests/tallies/inputs_true.dat b/tests/regression_tests/tallies/inputs_true.dat
index a85491e943..2c33a8fa0d 100644
--- a/tests/regression_tests/tallies/inputs_true.dat
+++ b/tests/regression_tests/tallies/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/tally_aggregation/inputs_true.dat b/tests/regression_tests/tally_aggregation/inputs_true.dat
index 7a8bf46133..86806572a0 100644
--- a/tests/regression_tests/tally_aggregation/inputs_true.dat
+++ b/tests/regression_tests/tally_aggregation/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/tally_arithmetic/inputs_true.dat b/tests/regression_tests/tally_arithmetic/inputs_true.dat
index 743ca3c582..3605005add 100644
--- a/tests/regression_tests/tally_arithmetic/inputs_true.dat
+++ b/tests/regression_tests/tally_arithmetic/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/tally_slice_merge/inputs_true.dat b/tests/regression_tests/tally_slice_merge/inputs_true.dat
index b1c089c965..ccd3655f9e 100644
--- a/tests/regression_tests/tally_slice_merge/inputs_true.dat
+++ b/tests/regression_tests/tally_slice_merge/inputs_true.dat
@@ -148,7 +148,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="1" name="UOX fuel">
+  <material depletable="true" id="1" name="UOX fuel">
     <density units="g/cm3" value="10.062" />
     <nuclide ao="4.9476e-06" name="U234" />
     <nuclide ao="0.00048218" name="U235" />
diff --git a/tests/regression_tests/triso/inputs_true.dat b/tests/regression_tests/triso/inputs_true.dat
index fdbc1cb5f1..6d674b4502 100644
--- a/tests/regression_tests/triso/inputs_true.dat
+++ b/tests/regression_tests/triso/inputs_true.dat
@@ -393,7 +393,7 @@
 </geometry>
 <?xml version='1.0' encoding='utf-8'?>
 <materials>
-  <material id="13">
+  <material depletable="true" id="13">
     <density units="g/cm3" value="10.5" />
     <nuclide ao="0.14154" name="U235" />
     <nuclide ao="0.85846" name="U238" />
diff --git a/tests/regression_tests/volume_calc/inputs_true.dat b/tests/regression_tests/volume_calc/inputs_true.dat
index 28f1cbd9fc..607921af26 100644
--- a/tests/regression_tests/volume_calc/inputs_true.dat
+++ b/tests/regression_tests/volume_calc/inputs_true.dat
@@ -18,7 +18,7 @@
     <nuclide ao="0.0001" name="B10" />
     <sab name="c_H_in_H2O" />
   </material>
-  <material id="2">
+  <material depletable="true" id="2">
     <density units="g/cc" value="4.5" />
     <nuclide ao="1.0" name="U235" />
     <nuclide ao="0.1" name="Mo99" />
diff --git a/tests/unit_tests/test_universe.py b/tests/unit_tests/test_universe.py
index 59e34e2017..89904524b6 100644
--- a/tests/unit_tests/test_universe.py
+++ b/tests/unit_tests/test_universe.py
@@ -59,7 +59,6 @@ def test_plot(run_in_tmpdir, sphere_model):
             pixels=(10, 10),
             color_by='material',
             colors=colors,
-            filename='test.png'
         )