diff --git a/tests/test_filter_delayedgroup/geometry.xml b/tests/test_filter_delayedgroup/geometry.xml
deleted file mode 100644
index b85dd04df9..0000000000
--- a/tests/test_filter_delayedgroup/geometry.xml
+++ /dev/null
@@ -1,181 +0,0 @@
-<?xml version="1.0"?>
-<geometry>
-
-  <surface id="1" type="z-cylinder" coeffs="0. 0. 0.41" />
-  <surface id="2" type="z-cylinder" coeffs="0. 0. 0.475" />
-  <surface id="3" type="z-cylinder" coeffs="0. 0. 0.56" />
-  <surface id="4" type="z-cylinder" coeffs="0. 0. 0.62" />
-  <surface id="5" type="z-cylinder" coeffs="0. 0. 187.6" />
-  <surface id="6" type="z-cylinder" coeffs="0. 0. 209.0" />
-  <surface id="7" type="z-cylinder" coeffs="0. 0. 229.0" />
-  <surface id="8" type="z-cylinder" coeffs="0. 0. 249.0" boundary="vacuum" />
-
-  <surface id="31" type="z-plane" coeffs="-229.0" boundary="vacuum" />
-  <surface id="32" type="z-plane" coeffs="-199.0" />
-  <surface id="33" type="z-plane" coeffs="-193.0" />
-  <surface id="34" type="z-plane" coeffs="-183.0" />
-  <surface id="35" type="z-plane" coeffs="0.0" />
-  <surface id="36" type="z-plane" coeffs="183.0" />
-  <surface id="37" type="z-plane" coeffs="203.0" />
-  <surface id="38" type="z-plane" coeffs="215.0" />
-  <surface id="39" type="z-plane" coeffs="223.0" boundary="vacuum" />
-
-  <!-- All geometry on base universe -->
-  <cell id="1"  fill="200"    surfaces="  -6 34 -35" /> <!-- Lower core -->
-  <cell id="2"  fill="201"    surfaces="  -6 35 -36" /> <!-- Upper core -->
-  <cell id="3"  material="8"  surfaces="  -7 31 -32" /> <!-- Lower core plate region -->
-  <cell id="4"  material="9"  surfaces="  -5 32 -33" /> <!-- Bottom nozzle region -->
-  <cell id="5"  material="12" surfaces="  -5 33 -34" /> <!-- Bottom FA region -->
-  <cell id="6"  material="11" surfaces="  -5 36 -37" /> <!-- Top FA region -->
-  <cell id="7"  material="10" surfaces="  -5 37 -38" /> <!-- Top nozzle region -->
-  <cell id="8"  material="7"  surfaces="  -7 38 -39" /> <!-- Upper plate region -->
-  <cell id="9"  material="4"  surfaces="6 -7 32 -38" /> <!-- Downcomer -->
-  <cell id="10" material="5"  surfaces="7 -8 31 -39" /> <!-- RPV -->
-  <cell id="11" material="6"  surfaces="5 -6 32 -34" /> <!-- Bottom of radial reflector -->
-  <cell id="12" material="7"  surfaces="5 -6 36 -38" /> <!-- Top of radial reflector -->
-
-  <!-- Fuel pin, cladding, cold water -->
-  <cell id="21" universe="1" material="1" surfaces="-1"   />
-  <cell id="22" universe="1" material="2" surfaces="1 -2" />
-  <cell id="23" universe="1" material="3" surfaces="2"    />
-
-  <!-- Instrumentation guide tube -->
-  <cell id="24" universe="2" material="3" surfaces="-3"   />
-  <cell id="25" universe="2" material="2" surfaces="3 -4" />
-  <cell id="26" universe="2" material="3" surfaces="4"    />
-
-  <!-- Fuel pin, cladding, hot water -->
-  <cell id="27" universe="3" material="1" surfaces="-1"   />
-  <cell id="28" universe="3" material="2" surfaces="1 -2" />
-  <cell id="29" universe="3" material="4" surfaces="2"    />
-
-  <!-- Instrumentation guide tube -->
-  <cell id="30" universe="4" material="4" surfaces="-3"   />
-  <cell id="31" universe="4" material="2" surfaces="3 -4" />
-  <cell id="32" universe="4" material="4" surfaces="4"    />
-
-  <!-- cell for water assembly (cold) -->
-  <cell id="50" universe="5" material="4" surfaces="34 -35" />
-
-  <!-- containing cell for fuel assembly -->
-  <cell id="60" universe="6" fill="100"   surfaces="34 -35" />
-
-  <!-- cell for water assembly (hot) -->
-  <cell id="70" universe="7" material="3" surfaces="35 -36" />
-
-  <!-- containing cell for fuel assembly -->
-  <cell id="80" universe="8" fill="101"   surfaces="35 -36" />
-
-  <!-- Fuel Assembly (Lower Half) -->
-  <lattice id="100">
-    <dimension>17 17</dimension>
-    <lower_left>-10.71 -10.71</lower_left>
-    <pitch>1.26 1.26</pitch>
-    <universes>
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1
-      1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 1
-      1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-    </universes>
-  </lattice>
-
-  <!-- Fuel Assembly (Upper Half) -->
-  <lattice id="101">
-    <dimension>17 17</dimension>
-    <lower_left>-10.71 -10.71</lower_left>
-    <pitch>1.26 1.26</pitch>
-    <universes>
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 4 3 3 4 3 3 4 3 3 3 3 3
-      3 3 3 4 3 3 3 3 3 3 3 3 3 4 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 4 3 3 4 3 3 4 3 3 4 3 3 4 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 4 3 3 4 3 3 4 3 3 4 3 3 4 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 4 3 3 4 3 3 4 3 3 4 3 3 4 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 4 3 3 3 3 3 3 3 3 3 4 3 3 3
-      3 3 3 3 3 4 3 3 4 3 3 4 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-    </universes>
-  </lattice>
-
-  <!-- Core Lattice (Lower Half) -->
-  <lattice id="200">
-    <dimension>21 21</dimension>
-    <lower_left>-224.91 -224.91</lower_left>
-    <pitch>21.42 21.42</pitch>
-    <universes>
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 6 6 6 6 6 6 6 5 5 5 5 5 5 5
-      5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5 5
-      5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5
-      5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5 5
-      5 5 5 5 5 5 5 6 6 6 6 6 6 6 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-    </universes>
-  </lattice>
-
-  <!-- Core Lattice (Upper Half) -->
-  <lattice id="201">
-    <dimension>21 21</dimension>
-    <lower_left>-224.91 -224.91</lower_left>
-    <pitch>21.42 21.42</pitch>
-    <universes>
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 8 8 8 8 8 8 8 7 7 7 7 7 7 7
-      7 7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7 7
-      7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7
-      7 7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7 7
-      7 7 7 7 7 7 7 8 8 8 8 8 8 8 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-    </universes>
-  </lattice>
-
-</geometry>
diff --git a/tests/test_filter_delayedgroup/inputs_true.dat b/tests/test_filter_delayedgroup/inputs_true.dat
new file mode 100644
index 0000000000..21bce00fd2
--- /dev/null
+++ b/tests/test_filter_delayedgroup/inputs_true.dat
@@ -0,0 +1 @@
+e771470681d3b4af57a70d148f5eb728df57f1fd7bdb5d6f76ac556b69f10bf0cdd5645fe488f1e17f07cbb72e9fb34af2fd7ede95c8e39c5ffa6ea9b6c5810e
\ No newline at end of file
diff --git a/tests/test_filter_delayedgroup/materials.xml b/tests/test_filter_delayedgroup/materials.xml
deleted file mode 100644
index 9c0b74f3f1..0000000000
--- a/tests/test_filter_delayedgroup/materials.xml
+++ /dev/null
@@ -1,272 +0,0 @@
-<?xml version="1.0"?>
-<materials>
-
-  <default_xs>71c</default_xs>
-
-  <!-- Fuel composition -->
-  <material id="1">
-    <density value="10.062" units="g/cm3" />
-    <nuclide name="U-234"   ao="4.9476e-6" />
-    <nuclide name="U-235"   ao="4.8218e-4" />
-    <nuclide name="U-236"   ao="9.0402e-5" />
-    <nuclide name="U-238"   ao="2.1504e-2" />
-    <nuclide name="Np-237"  ao="7.3733e-6" />
-    <nuclide name="Pu-238"  ao="1.5148e-6" />
-    <nuclide name="Pu-239"  ao="1.3955e-4" />
-    <nuclide name="Pu-240"  ao="3.4405e-5" />
-    <nuclide name="Pu-241"  ao="2.1439e-5" />
-    <nuclide name="Pu-242"  ao="3.7422e-6" />
-    <nuclide name="Am-241"  ao="4.5041e-7" />
-    <nuclide name="Am-242m" ao="9.2301e-9" />
-    <nuclide name="Am-243"  ao="4.7878e-7" />
-    <nuclide name="Cm-242"  ao="1.0485e-7" />
-    <nuclide name="Cm-243"  ao="1.4268e-9" />
-    <nuclide name="Cm-244"  ao="8.8756e-8" />
-    <nuclide name="Cm-245"  ao="3.5285e-9" />
-    <nuclide name="Mo-95"   ao="2.6497e-5" />
-    <nuclide name="Tc-99"   ao="3.2772e-5" />
-    <nuclide name="Ru-101"  ao="3.0742e-5" />
-    <nuclide name="Ru-103"  ao="2.3505e-6" />
-    <nuclide name="Ag-109"  ao="2.0009e-6" />
-    <nuclide name="Xe-135"  ao="1.0801e-8" />
-    <nuclide name="Cs-133"  ao="3.4612e-5" />
-    <nuclide name="Nd-143"  ao="2.6078e-5" />
-    <nuclide name="Nd-145"  ao="1.9898e-5" />
-    <nuclide name="Sm-147"  ao="1.6128e-6" />
-    <nuclide name="Sm-149"  ao="1.1627e-7" />
-    <nuclide name="Sm-150"  ao="7.1727e-6" />
-    <nuclide name="Sm-151"  ao="5.4947e-7" />
-    <nuclide name="Sm-152"  ao="3.0221e-6" />
-    <nuclide name="Eu-153"  ao="2.6209e-6" />
-    <nuclide name="Gd-155"  ao="1.5369e-9" />
-    <nuclide name="O-16"    ao="4.5737e-2" />
-  </material>
-
-  <!-- Cladding composition -->
-  <material id="2">
-    <density value="5.77" units="g/cm3" />
-    <nuclide name="Zr-90" ao="0.5145" />
-    <nuclide name="Zr-91" ao="0.1122" />
-    <nuclide name="Zr-92" ao="0.1715" />
-    <nuclide name="Zr-94" ao="0.1738" />
-    <nuclide name="Zr-96" ao="0.0280" />
-  </material>
-
-  <!-- Cold borated water -->
-  <material id="3">
-    <density value="0.07416" units="atom/b-cm" />
-    <nuclide name="H-1" ao="2.0" />
-    <nuclide name="O-16" ao="1.0" />
-    <nuclide name="B-10" ao="6.490e-4" />
-    <nuclide name="B-11" ao="2.689e-3" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Hot borated water -->
-  <material id="4">
-    <density value="0.06614" units="atom/b-cm" />
-    <nuclide name="H-1"  ao="2.0" />
-    <nuclide name="O-16" ao="1.0" />
-    <nuclide name="B-10" ao="6.490e-4" />
-    <nuclide name="B-11" ao="2.689e-3" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- RPV Composition -->
-  <material id="5">
-    <density value="7.9" units="g/cm3" />
-    <nuclide name="Fe-54"  wo="0.05437098" />
-    <nuclide name="Fe-56"  wo="0.88500663" />
-    <nuclide name="Fe-57"  wo="0.0208008" />
-    <nuclide name="Fe-58"  wo="0.00282159" />
-    <nuclide name="Ni-58"  wo="0.0067198" />
-    <nuclide name="Ni-60"  wo="0.0026776" />
-    <nuclide name="Ni-61"  wo="0.0001183" />
-    <nuclide name="Ni-62"  wo="0.0003835" />
-    <nuclide name="Ni-64"  wo="0.0001008" />
-    <nuclide name="Mn-55"  wo="0.01" />
-    <nuclide name="Mo-92"  wo="0.000849" />
-    <nuclide name="Mo-94"  wo="0.0005418" />
-    <nuclide name="Mo-95"  wo="0.0009438" />
-    <nuclide name="Mo-96"  wo="0.0010002" />
-    <nuclide name="Mo-97"  wo="0.0005796" />
-    <nuclide name="Mo-98"  wo="0.0014814" />
-    <nuclide name="Mo-100" wo="0.0006042" />
-    <nuclide name="Si-28"  wo="0.00367464" />
-    <nuclide name="Si-29"  wo="0.00019336" />
-    <nuclide name="Si-30"  wo="0.000132" />
-    <nuclide name="Cr-50"  wo="0.00010435" />
-    <nuclide name="Cr-52"  wo="0.002092475" />
-    <nuclide name="Cr-53"  wo="0.00024185" />
-    <nuclide name="Cr-54"  wo="6.1325e-05" />
-    <nuclide name="C-Nat"  wo="0.0025" />
-    <nuclide name="Cu-63"  wo="0.0013696" />
-    <nuclide name="Cu-65"  wo="0.0006304" />
-  </material>
-
-  <!-- Lower radial reflector -->
-  <material id="6">
-    <density value="4.32" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0095661" />
-    <nuclide name="O-16"  wo="0.0759107" />
-    <nuclide name="B-10"  wo="3.08409e-5" />
-    <nuclide name="B-11"  wo="1.40499e-4" />
-    <nuclide name="Fe-54" wo="0.035620772088" />
-    <nuclide name="Fe-56" wo="0.579805982228" />
-    <nuclide name="Fe-57" wo="0.01362750048" />
-    <nuclide name="Fe-58" wo="0.001848545204" />
-    <nuclide name="Ni-58" wo="0.055298376566" />
-    <nuclide name="Ni-60" wo="0.022034425592" />
-    <nuclide name="Ni-61" wo="0.000973510811" />
-    <nuclide name="Ni-62" wo="0.003155886695" />
-    <nuclide name="Ni-64" wo="0.000829500336" />
-    <nuclide name="Mn-55" wo="0.0182870" />
-    <nuclide name="Si-28" wo="0.00839976771" />
-    <nuclide name="Si-29" wo="0.00044199679" />
-    <nuclide name="Si-30" wo="0.0003017355" />
-    <nuclide name="Cr-50" wo="0.007251360806" />
-    <nuclide name="Cr-52" wo="0.145407678031" />
-    <nuclide name="Cr-53" wo="0.016806340306" />
-    <nuclide name="Cr-54" wo="0.004261520857" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Upper radial reflector / Top plate region -->
-  <material id="7">
-    <density value="4.28" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0086117" />
-    <nuclide name="O-16"  wo="0.0683369" />
-    <nuclide name="B-10"  wo="2.77638e-5" />
-    <nuclide name="B-11"  wo="1.26481e-4" />
-    <nuclide name="Fe-54" wo="0.035953677186" />
-    <nuclide name="Fe-56" wo="0.585224740891" />
-    <nuclide name="Fe-57" wo="0.01375486056" />
-    <nuclide name="Fe-58" wo="0.001865821363" />
-    <nuclide name="Ni-58" wo="0.055815129186" />
-    <nuclide name="Ni-60" wo="0.022240333032" />
-    <nuclide name="Ni-61" wo="0.000982608081" />
-    <nuclide name="Ni-62" wo="0.003185377845" />
-    <nuclide name="Ni-64" wo="0.000837251856" />
-    <nuclide name="Mn-55" wo="0.0184579" />
-    <nuclide name="Si-28" wo="0.00847831314" />
-    <nuclide name="Si-29" wo="0.00044612986" />
-    <nuclide name="Si-30" wo="0.000304557" />
-    <nuclide name="Cr-50" wo="0.00731912987" />
-    <nuclide name="Cr-52" wo="0.146766614995" />
-    <nuclide name="Cr-53" wo="0.01696340737" />
-    <nuclide name="Cr-54" wo="0.004301347765" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Bottom plate region -->
-  <material id="8">
-    <density value="7.184" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0011505" />
-    <nuclide name="O-16"  wo="0.0091296" />
-    <nuclide name="B-10"  wo="3.70915e-6" />
-    <nuclide name="B-11"  wo="1.68974e-5" />
-    <nuclide name="Fe-54" wo="0.03855611055" />
-    <nuclide name="Fe-56" wo="0.627585036425" />
-    <nuclide name="Fe-57" wo="0.014750478" />
-    <nuclide name="Fe-58" wo="0.002000875025" />
-    <nuclide name="Ni-58" wo="0.059855207342" />
-    <nuclide name="Ni-60" wo="0.023850159704" />
-    <nuclide name="Ni-61" wo="0.001053732407" />
-    <nuclide name="Ni-62" wo="0.003415945715" />
-    <nuclide name="Ni-64" wo="0.000897854832" />
-    <nuclide name="Mn-55" wo="0.0197940" />
-    <nuclide name="Si-28" wo="0.00909197802" />
-    <nuclide name="Si-29" wo="0.00047842098" />
-    <nuclide name="Si-30" wo="0.000326601" />
-    <nuclide name="Cr-50" wo="0.007848910646" />
-    <nuclide name="Cr-52" wo="0.157390026871" />
-    <nuclide name="Cr-53" wo="0.018191270146" />
-    <nuclide name="Cr-54" wo="0.004612692337" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Bottom nozzle region -->
-  <material id="9">
-    <density value="2.53" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0245014" />
-    <nuclide name="O-16"  wo="0.1944274" />
-    <nuclide name="B-10"  wo="7.89917e-5" />
-    <nuclide name="B-11"  wo="3.59854e-4" />
-    <nuclide name="Fe-54" wo="0.030411411144" />
-    <nuclide name="Fe-56" wo="0.495012237964" />
-    <nuclide name="Fe-57" wo="0.01163454624" />
-    <nuclide name="Fe-58" wo="0.001578204652" />
-    <nuclide name="Ni-58" wo="0.047211231662" />
-    <nuclide name="Ni-60" wo="0.018811987544" />
-    <nuclide name="Ni-61" wo="0.000831139127" />
-    <nuclide name="Ni-62" wo="0.002694352115" />
-    <nuclide name="Ni-64" wo="0.000708189552" />
-    <nuclide name="Mn-55" wo="0.0156126" />
-    <nuclide name="Si-28" wo="0.007171335558" />
-    <nuclide name="Si-29" wo="0.000377356542" />
-    <nuclide name="Si-30" wo="0.0002576079" />
-    <nuclide name="Cr-50" wo="0.006190885148" />
-    <nuclide name="Cr-52" wo="0.124142524198" />
-    <nuclide name="Cr-53" wo="0.014348496148" />
-    <nuclide name="Cr-54" wo="0.003638294506" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Top nozzle region -->
-  <material id="10">
-    <density value="1.746" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0358870" />
-    <nuclide name="O-16"  wo="0.2847761" />
-    <nuclide name="B-10"  wo="1.15699e-4" />
-    <nuclide name="B-11"  wo="5.27075e-4" />
-    <nuclide name="Fe-54" wo="0.02644016154" />
-    <nuclide name="Fe-56" wo="0.43037146399" />
-    <nuclide name="Fe-57" wo="0.0101152584" />
-    <nuclide name="Fe-58" wo="0.00137211607" />
-    <nuclide name="Ni-58" wo="0.04104621835" />
-    <nuclide name="Ni-60" wo="0.0163554502" />
-    <nuclide name="Ni-61" wo="0.000722605975" />
-    <nuclide name="Ni-62" wo="0.002342513875" />
-    <nuclide name="Ni-64" wo="0.0006157116" />
-    <nuclide name="Mn-55" wo="0.0135739" />
-    <nuclide name="Si-28" wo="0.006234853554" />
-    <nuclide name="Si-29" wo="0.000328078746" />
-    <nuclide name="Si-30" wo="0.0002239677" />
-    <nuclide name="Cr-50" wo="0.005382452306" />
-    <nuclide name="Cr-52" wo="0.107931450781" />
-    <nuclide name="Cr-53" wo="0.012474806806" />
-    <nuclide name="Cr-54" wo="0.003163190107" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Top of Fuel Assemblies -->
-  <material id="11">
-    <density value="3.044" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0162913" />
-    <nuclide name="O-16"  wo="0.1292776" />
-    <nuclide name="B-10"  wo="5.25228e-5" />
-    <nuclide name="B-11"  wo="2.39272e-4" />
-    <nuclide name="Zr-90" wo="0.43313403903" />
-    <nuclide name="Zr-91" wo="0.09549277374" />
-    <nuclide name="Zr-92" wo="0.14759527104" />
-    <nuclide name="Zr-94" wo="0.15280552077" />
-    <nuclide name="Zr-96" wo="0.02511169542" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Bottom of Fuel Assemblies -->
-  <material id="12">
-    <density value="1.762" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0292856" />
-    <nuclide name="O-16"  wo="0.2323919" />
-    <nuclide name="B-10"  wo="9.44159e-5" />
-    <nuclide name="B-11"  wo="4.30120e-4" />
-    <nuclide name="Zr-90" wo="0.3741373658" />
-    <nuclide name="Zr-91" wo="0.0824858164" />
-    <nuclide name="Zr-92" wo="0.1274914944" />
-    <nuclide name="Zr-94" wo="0.1319920622" />
-    <nuclide name="Zr-96" wo="0.0216912612" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-</materials>
diff --git a/tests/test_filter_delayedgroup/results_true.dat b/tests/test_filter_delayedgroup/results_true.dat
index f44821a238..9db6de2562 100644
--- a/tests/test_filter_delayedgroup/results_true.dat
+++ b/tests/test_filter_delayedgroup/results_true.dat
@@ -1,15 +1,15 @@
 k-combined:
-1.005983E+00 2.248579E-02
+9.903196E-01 4.279617E-02
 tally 1:
-6.113116E-04
-7.519725E-08
-3.155402E-03
-2.003485E-06
-3.012421E-03
-1.826031E-06
-6.754097E-03
-9.179336E-06
-2.769084E-03
-1.542940E-06
-1.159960E-03
-2.707463E-07
+8.141852E-04
+1.337187E-07
+4.849156E-03
+4.744020E-06
+4.460252E-03
+4.015453E-06
+1.028479E-02
+2.136252E-05
+5.002274E-03
+5.056965E-06
+1.974747E-03
+7.882970E-07
diff --git a/tests/test_filter_delayedgroup/settings.xml b/tests/test_filter_delayedgroup/settings.xml
deleted file mode 100644
index 517637a59f..0000000000
--- a/tests/test_filter_delayedgroup/settings.xml
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0"?>
-<settings>
-
-  <eigenvalue>
-    <batches>10</batches>
-    <inactive>5</inactive>
-    <particles>100</particles>
-  </eigenvalue>
-
-  <source>
-    <space type="box">
-      <parameters>
-        -160 -160 -183
-         160  160  183
-      </parameters>
-    </space>
-  </source>
-
-</settings>
diff --git a/tests/test_filter_delayedgroup/tallies.xml b/tests/test_filter_delayedgroup/tallies.xml
deleted file mode 100644
index b3649b4697..0000000000
--- a/tests/test_filter_delayedgroup/tallies.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0"?>
-<tallies>
-
-  <tally id="1">
-    <filter type="delayedgroup" bins="1 2 3 4 5 6" />
-    <scores>delayed-nu-fission</scores>
-    <nuclides>U-235</nuclides>
-  </tally>
-
-</tallies>
diff --git a/tests/test_filter_delayedgroup/test_filter_delayedgroup.py b/tests/test_filter_delayedgroup/test_filter_delayedgroup.py
index 1777db993e..bdad3cc958 100644
--- a/tests/test_filter_delayedgroup/test_filter_delayedgroup.py
+++ b/tests/test_filter_delayedgroup/test_filter_delayedgroup.py
@@ -1,10 +1,30 @@
 #!/usr/bin/env python
 
+import os
 import sys
-sys.path.insert(0, '..')
-from testing_harness import TestHarness
+sys.path.insert(0, os.pardir)
+from testing_harness import TestHarness, PyAPITestHarness
+import openmc
+
+
+class FilterDelayedgroupTestHarness(PyAPITestHarness):
+    def _build_inputs(self):
+        filt = openmc.Filter(type='delayedgroup',
+                             bins=(1, 2, 3, 4, 5, 6))
+        tally = openmc.Tally(tally_id=1)
+        tally.add_filter(filt)
+        tally.add_score('delayed-nu-fission')
+        self._input_set.tallies = openmc.TalliesFile()
+        self._input_set.tallies.add_tally(tally)
+
+        super(FilterDelayedgroupTestHarness, self)._build_inputs()
+
+    def _cleanup(self):
+        super(FilterDelayedgroupTestHarness, self)._cleanup()
+        f = os.path.join(os.getcwd(), 'tallies.xml')
+        if os.path.exists(f): os.remove(f)
 
 
 if __name__ == '__main__':
-    harness = TestHarness('statepoint.10.*', True)
+    harness = FilterDelayedgroupTestHarness('statepoint.10.*', True)
     harness.main()
diff --git a/tests/test_score_delayed_nufission/geometry.xml b/tests/test_score_delayed_nufission/geometry.xml
deleted file mode 100644
index b85dd04df9..0000000000
--- a/tests/test_score_delayed_nufission/geometry.xml
+++ /dev/null
@@ -1,181 +0,0 @@
-<?xml version="1.0"?>
-<geometry>
-
-  <surface id="1" type="z-cylinder" coeffs="0. 0. 0.41" />
-  <surface id="2" type="z-cylinder" coeffs="0. 0. 0.475" />
-  <surface id="3" type="z-cylinder" coeffs="0. 0. 0.56" />
-  <surface id="4" type="z-cylinder" coeffs="0. 0. 0.62" />
-  <surface id="5" type="z-cylinder" coeffs="0. 0. 187.6" />
-  <surface id="6" type="z-cylinder" coeffs="0. 0. 209.0" />
-  <surface id="7" type="z-cylinder" coeffs="0. 0. 229.0" />
-  <surface id="8" type="z-cylinder" coeffs="0. 0. 249.0" boundary="vacuum" />
-
-  <surface id="31" type="z-plane" coeffs="-229.0" boundary="vacuum" />
-  <surface id="32" type="z-plane" coeffs="-199.0" />
-  <surface id="33" type="z-plane" coeffs="-193.0" />
-  <surface id="34" type="z-plane" coeffs="-183.0" />
-  <surface id="35" type="z-plane" coeffs="0.0" />
-  <surface id="36" type="z-plane" coeffs="183.0" />
-  <surface id="37" type="z-plane" coeffs="203.0" />
-  <surface id="38" type="z-plane" coeffs="215.0" />
-  <surface id="39" type="z-plane" coeffs="223.0" boundary="vacuum" />
-
-  <!-- All geometry on base universe -->
-  <cell id="1"  fill="200"    surfaces="  -6 34 -35" /> <!-- Lower core -->
-  <cell id="2"  fill="201"    surfaces="  -6 35 -36" /> <!-- Upper core -->
-  <cell id="3"  material="8"  surfaces="  -7 31 -32" /> <!-- Lower core plate region -->
-  <cell id="4"  material="9"  surfaces="  -5 32 -33" /> <!-- Bottom nozzle region -->
-  <cell id="5"  material="12" surfaces="  -5 33 -34" /> <!-- Bottom FA region -->
-  <cell id="6"  material="11" surfaces="  -5 36 -37" /> <!-- Top FA region -->
-  <cell id="7"  material="10" surfaces="  -5 37 -38" /> <!-- Top nozzle region -->
-  <cell id="8"  material="7"  surfaces="  -7 38 -39" /> <!-- Upper plate region -->
-  <cell id="9"  material="4"  surfaces="6 -7 32 -38" /> <!-- Downcomer -->
-  <cell id="10" material="5"  surfaces="7 -8 31 -39" /> <!-- RPV -->
-  <cell id="11" material="6"  surfaces="5 -6 32 -34" /> <!-- Bottom of radial reflector -->
-  <cell id="12" material="7"  surfaces="5 -6 36 -38" /> <!-- Top of radial reflector -->
-
-  <!-- Fuel pin, cladding, cold water -->
-  <cell id="21" universe="1" material="1" surfaces="-1"   />
-  <cell id="22" universe="1" material="2" surfaces="1 -2" />
-  <cell id="23" universe="1" material="3" surfaces="2"    />
-
-  <!-- Instrumentation guide tube -->
-  <cell id="24" universe="2" material="3" surfaces="-3"   />
-  <cell id="25" universe="2" material="2" surfaces="3 -4" />
-  <cell id="26" universe="2" material="3" surfaces="4"    />
-
-  <!-- Fuel pin, cladding, hot water -->
-  <cell id="27" universe="3" material="1" surfaces="-1"   />
-  <cell id="28" universe="3" material="2" surfaces="1 -2" />
-  <cell id="29" universe="3" material="4" surfaces="2"    />
-
-  <!-- Instrumentation guide tube -->
-  <cell id="30" universe="4" material="4" surfaces="-3"   />
-  <cell id="31" universe="4" material="2" surfaces="3 -4" />
-  <cell id="32" universe="4" material="4" surfaces="4"    />
-
-  <!-- cell for water assembly (cold) -->
-  <cell id="50" universe="5" material="4" surfaces="34 -35" />
-
-  <!-- containing cell for fuel assembly -->
-  <cell id="60" universe="6" fill="100"   surfaces="34 -35" />
-
-  <!-- cell for water assembly (hot) -->
-  <cell id="70" universe="7" material="3" surfaces="35 -36" />
-
-  <!-- containing cell for fuel assembly -->
-  <cell id="80" universe="8" fill="101"   surfaces="35 -36" />
-
-  <!-- Fuel Assembly (Lower Half) -->
-  <lattice id="100">
-    <dimension>17 17</dimension>
-    <lower_left>-10.71 -10.71</lower_left>
-    <pitch>1.26 1.26</pitch>
-    <universes>
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1
-      1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 2 1 1 2 1 1 2 1 1 2 1 1 2 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 2 1 1 1 1 1 1 1 1 1 2 1 1 1
-      1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-      1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-    </universes>
-  </lattice>
-
-  <!-- Fuel Assembly (Upper Half) -->
-  <lattice id="101">
-    <dimension>17 17</dimension>
-    <lower_left>-10.71 -10.71</lower_left>
-    <pitch>1.26 1.26</pitch>
-    <universes>
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 4 3 3 4 3 3 4 3 3 3 3 3
-      3 3 3 4 3 3 3 3 3 3 3 3 3 4 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 4 3 3 4 3 3 4 3 3 4 3 3 4 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 4 3 3 4 3 3 4 3 3 4 3 3 4 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 4 3 3 4 3 3 4 3 3 4 3 3 4 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 4 3 3 3 3 3 3 3 3 3 4 3 3 3
-      3 3 3 3 3 4 3 3 4 3 3 4 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-      3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
-    </universes>
-  </lattice>
-
-  <!-- Core Lattice (Lower Half) -->
-  <lattice id="200">
-    <dimension>21 21</dimension>
-    <lower_left>-224.91 -224.91</lower_left>
-    <pitch>21.42 21.42</pitch>
-    <universes>
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 6 6 6 6 6 6 6 5 5 5 5 5 5 5
-      5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5 5
-      5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5
-      5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5
-      5 5 5 5 5 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5 5
-      5 5 5 5 5 5 5 6 6 6 6 6 6 6 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-      5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
-    </universes>
-  </lattice>
-
-  <!-- Core Lattice (Upper Half) -->
-  <lattice id="201">
-    <dimension>21 21</dimension>
-    <lower_left>-224.91 -224.91</lower_left>
-    <pitch>21.42 21.42</pitch>
-    <universes>
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 8 8 8 8 8 8 8 7 7 7 7 7 7 7
-      7 7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7 7
-      7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7
-      7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7
-      7 7 7 7 7 8 8 8 8 8 8 8 8 8 8 8 7 7 7 7 7
-      7 7 7 7 7 7 7 8 8 8 8 8 8 8 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-      7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7 7
-    </universes>
-  </lattice>
-
-</geometry>
diff --git a/tests/test_score_delayed_nufission/inputs_true.dat b/tests/test_score_delayed_nufission/inputs_true.dat
new file mode 100644
index 0000000000..5a0ec8a211
--- /dev/null
+++ b/tests/test_score_delayed_nufission/inputs_true.dat
@@ -0,0 +1 @@
+f3c246a1c83b1283163b22069f78231e3f6623fa3c2eb664ce400d0fff07105b6106d0fa8c6dfd49512a7eb676c80e4ee602e19063a9fc453394fe07a94a1bdd
\ No newline at end of file
diff --git a/tests/test_score_delayed_nufission/materials.xml b/tests/test_score_delayed_nufission/materials.xml
deleted file mode 100644
index 9c0b74f3f1..0000000000
--- a/tests/test_score_delayed_nufission/materials.xml
+++ /dev/null
@@ -1,272 +0,0 @@
-<?xml version="1.0"?>
-<materials>
-
-  <default_xs>71c</default_xs>
-
-  <!-- Fuel composition -->
-  <material id="1">
-    <density value="10.062" units="g/cm3" />
-    <nuclide name="U-234"   ao="4.9476e-6" />
-    <nuclide name="U-235"   ao="4.8218e-4" />
-    <nuclide name="U-236"   ao="9.0402e-5" />
-    <nuclide name="U-238"   ao="2.1504e-2" />
-    <nuclide name="Np-237"  ao="7.3733e-6" />
-    <nuclide name="Pu-238"  ao="1.5148e-6" />
-    <nuclide name="Pu-239"  ao="1.3955e-4" />
-    <nuclide name="Pu-240"  ao="3.4405e-5" />
-    <nuclide name="Pu-241"  ao="2.1439e-5" />
-    <nuclide name="Pu-242"  ao="3.7422e-6" />
-    <nuclide name="Am-241"  ao="4.5041e-7" />
-    <nuclide name="Am-242m" ao="9.2301e-9" />
-    <nuclide name="Am-243"  ao="4.7878e-7" />
-    <nuclide name="Cm-242"  ao="1.0485e-7" />
-    <nuclide name="Cm-243"  ao="1.4268e-9" />
-    <nuclide name="Cm-244"  ao="8.8756e-8" />
-    <nuclide name="Cm-245"  ao="3.5285e-9" />
-    <nuclide name="Mo-95"   ao="2.6497e-5" />
-    <nuclide name="Tc-99"   ao="3.2772e-5" />
-    <nuclide name="Ru-101"  ao="3.0742e-5" />
-    <nuclide name="Ru-103"  ao="2.3505e-6" />
-    <nuclide name="Ag-109"  ao="2.0009e-6" />
-    <nuclide name="Xe-135"  ao="1.0801e-8" />
-    <nuclide name="Cs-133"  ao="3.4612e-5" />
-    <nuclide name="Nd-143"  ao="2.6078e-5" />
-    <nuclide name="Nd-145"  ao="1.9898e-5" />
-    <nuclide name="Sm-147"  ao="1.6128e-6" />
-    <nuclide name="Sm-149"  ao="1.1627e-7" />
-    <nuclide name="Sm-150"  ao="7.1727e-6" />
-    <nuclide name="Sm-151"  ao="5.4947e-7" />
-    <nuclide name="Sm-152"  ao="3.0221e-6" />
-    <nuclide name="Eu-153"  ao="2.6209e-6" />
-    <nuclide name="Gd-155"  ao="1.5369e-9" />
-    <nuclide name="O-16"    ao="4.5737e-2" />
-  </material>
-
-  <!-- Cladding composition -->
-  <material id="2">
-    <density value="5.77" units="g/cm3" />
-    <nuclide name="Zr-90" ao="0.5145" />
-    <nuclide name="Zr-91" ao="0.1122" />
-    <nuclide name="Zr-92" ao="0.1715" />
-    <nuclide name="Zr-94" ao="0.1738" />
-    <nuclide name="Zr-96" ao="0.0280" />
-  </material>
-
-  <!-- Cold borated water -->
-  <material id="3">
-    <density value="0.07416" units="atom/b-cm" />
-    <nuclide name="H-1" ao="2.0" />
-    <nuclide name="O-16" ao="1.0" />
-    <nuclide name="B-10" ao="6.490e-4" />
-    <nuclide name="B-11" ao="2.689e-3" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Hot borated water -->
-  <material id="4">
-    <density value="0.06614" units="atom/b-cm" />
-    <nuclide name="H-1"  ao="2.0" />
-    <nuclide name="O-16" ao="1.0" />
-    <nuclide name="B-10" ao="6.490e-4" />
-    <nuclide name="B-11" ao="2.689e-3" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- RPV Composition -->
-  <material id="5">
-    <density value="7.9" units="g/cm3" />
-    <nuclide name="Fe-54"  wo="0.05437098" />
-    <nuclide name="Fe-56"  wo="0.88500663" />
-    <nuclide name="Fe-57"  wo="0.0208008" />
-    <nuclide name="Fe-58"  wo="0.00282159" />
-    <nuclide name="Ni-58"  wo="0.0067198" />
-    <nuclide name="Ni-60"  wo="0.0026776" />
-    <nuclide name="Ni-61"  wo="0.0001183" />
-    <nuclide name="Ni-62"  wo="0.0003835" />
-    <nuclide name="Ni-64"  wo="0.0001008" />
-    <nuclide name="Mn-55"  wo="0.01" />
-    <nuclide name="Mo-92"  wo="0.000849" />
-    <nuclide name="Mo-94"  wo="0.0005418" />
-    <nuclide name="Mo-95"  wo="0.0009438" />
-    <nuclide name="Mo-96"  wo="0.0010002" />
-    <nuclide name="Mo-97"  wo="0.0005796" />
-    <nuclide name="Mo-98"  wo="0.0014814" />
-    <nuclide name="Mo-100" wo="0.0006042" />
-    <nuclide name="Si-28"  wo="0.00367464" />
-    <nuclide name="Si-29"  wo="0.00019336" />
-    <nuclide name="Si-30"  wo="0.000132" />
-    <nuclide name="Cr-50"  wo="0.00010435" />
-    <nuclide name="Cr-52"  wo="0.002092475" />
-    <nuclide name="Cr-53"  wo="0.00024185" />
-    <nuclide name="Cr-54"  wo="6.1325e-05" />
-    <nuclide name="C-Nat"  wo="0.0025" />
-    <nuclide name="Cu-63"  wo="0.0013696" />
-    <nuclide name="Cu-65"  wo="0.0006304" />
-  </material>
-
-  <!-- Lower radial reflector -->
-  <material id="6">
-    <density value="4.32" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0095661" />
-    <nuclide name="O-16"  wo="0.0759107" />
-    <nuclide name="B-10"  wo="3.08409e-5" />
-    <nuclide name="B-11"  wo="1.40499e-4" />
-    <nuclide name="Fe-54" wo="0.035620772088" />
-    <nuclide name="Fe-56" wo="0.579805982228" />
-    <nuclide name="Fe-57" wo="0.01362750048" />
-    <nuclide name="Fe-58" wo="0.001848545204" />
-    <nuclide name="Ni-58" wo="0.055298376566" />
-    <nuclide name="Ni-60" wo="0.022034425592" />
-    <nuclide name="Ni-61" wo="0.000973510811" />
-    <nuclide name="Ni-62" wo="0.003155886695" />
-    <nuclide name="Ni-64" wo="0.000829500336" />
-    <nuclide name="Mn-55" wo="0.0182870" />
-    <nuclide name="Si-28" wo="0.00839976771" />
-    <nuclide name="Si-29" wo="0.00044199679" />
-    <nuclide name="Si-30" wo="0.0003017355" />
-    <nuclide name="Cr-50" wo="0.007251360806" />
-    <nuclide name="Cr-52" wo="0.145407678031" />
-    <nuclide name="Cr-53" wo="0.016806340306" />
-    <nuclide name="Cr-54" wo="0.004261520857" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Upper radial reflector / Top plate region -->
-  <material id="7">
-    <density value="4.28" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0086117" />
-    <nuclide name="O-16"  wo="0.0683369" />
-    <nuclide name="B-10"  wo="2.77638e-5" />
-    <nuclide name="B-11"  wo="1.26481e-4" />
-    <nuclide name="Fe-54" wo="0.035953677186" />
-    <nuclide name="Fe-56" wo="0.585224740891" />
-    <nuclide name="Fe-57" wo="0.01375486056" />
-    <nuclide name="Fe-58" wo="0.001865821363" />
-    <nuclide name="Ni-58" wo="0.055815129186" />
-    <nuclide name="Ni-60" wo="0.022240333032" />
-    <nuclide name="Ni-61" wo="0.000982608081" />
-    <nuclide name="Ni-62" wo="0.003185377845" />
-    <nuclide name="Ni-64" wo="0.000837251856" />
-    <nuclide name="Mn-55" wo="0.0184579" />
-    <nuclide name="Si-28" wo="0.00847831314" />
-    <nuclide name="Si-29" wo="0.00044612986" />
-    <nuclide name="Si-30" wo="0.000304557" />
-    <nuclide name="Cr-50" wo="0.00731912987" />
-    <nuclide name="Cr-52" wo="0.146766614995" />
-    <nuclide name="Cr-53" wo="0.01696340737" />
-    <nuclide name="Cr-54" wo="0.004301347765" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Bottom plate region -->
-  <material id="8">
-    <density value="7.184" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0011505" />
-    <nuclide name="O-16"  wo="0.0091296" />
-    <nuclide name="B-10"  wo="3.70915e-6" />
-    <nuclide name="B-11"  wo="1.68974e-5" />
-    <nuclide name="Fe-54" wo="0.03855611055" />
-    <nuclide name="Fe-56" wo="0.627585036425" />
-    <nuclide name="Fe-57" wo="0.014750478" />
-    <nuclide name="Fe-58" wo="0.002000875025" />
-    <nuclide name="Ni-58" wo="0.059855207342" />
-    <nuclide name="Ni-60" wo="0.023850159704" />
-    <nuclide name="Ni-61" wo="0.001053732407" />
-    <nuclide name="Ni-62" wo="0.003415945715" />
-    <nuclide name="Ni-64" wo="0.000897854832" />
-    <nuclide name="Mn-55" wo="0.0197940" />
-    <nuclide name="Si-28" wo="0.00909197802" />
-    <nuclide name="Si-29" wo="0.00047842098" />
-    <nuclide name="Si-30" wo="0.000326601" />
-    <nuclide name="Cr-50" wo="0.007848910646" />
-    <nuclide name="Cr-52" wo="0.157390026871" />
-    <nuclide name="Cr-53" wo="0.018191270146" />
-    <nuclide name="Cr-54" wo="0.004612692337" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Bottom nozzle region -->
-  <material id="9">
-    <density value="2.53" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0245014" />
-    <nuclide name="O-16"  wo="0.1944274" />
-    <nuclide name="B-10"  wo="7.89917e-5" />
-    <nuclide name="B-11"  wo="3.59854e-4" />
-    <nuclide name="Fe-54" wo="0.030411411144" />
-    <nuclide name="Fe-56" wo="0.495012237964" />
-    <nuclide name="Fe-57" wo="0.01163454624" />
-    <nuclide name="Fe-58" wo="0.001578204652" />
-    <nuclide name="Ni-58" wo="0.047211231662" />
-    <nuclide name="Ni-60" wo="0.018811987544" />
-    <nuclide name="Ni-61" wo="0.000831139127" />
-    <nuclide name="Ni-62" wo="0.002694352115" />
-    <nuclide name="Ni-64" wo="0.000708189552" />
-    <nuclide name="Mn-55" wo="0.0156126" />
-    <nuclide name="Si-28" wo="0.007171335558" />
-    <nuclide name="Si-29" wo="0.000377356542" />
-    <nuclide name="Si-30" wo="0.0002576079" />
-    <nuclide name="Cr-50" wo="0.006190885148" />
-    <nuclide name="Cr-52" wo="0.124142524198" />
-    <nuclide name="Cr-53" wo="0.014348496148" />
-    <nuclide name="Cr-54" wo="0.003638294506" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Top nozzle region -->
-  <material id="10">
-    <density value="1.746" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0358870" />
-    <nuclide name="O-16"  wo="0.2847761" />
-    <nuclide name="B-10"  wo="1.15699e-4" />
-    <nuclide name="B-11"  wo="5.27075e-4" />
-    <nuclide name="Fe-54" wo="0.02644016154" />
-    <nuclide name="Fe-56" wo="0.43037146399" />
-    <nuclide name="Fe-57" wo="0.0101152584" />
-    <nuclide name="Fe-58" wo="0.00137211607" />
-    <nuclide name="Ni-58" wo="0.04104621835" />
-    <nuclide name="Ni-60" wo="0.0163554502" />
-    <nuclide name="Ni-61" wo="0.000722605975" />
-    <nuclide name="Ni-62" wo="0.002342513875" />
-    <nuclide name="Ni-64" wo="0.0006157116" />
-    <nuclide name="Mn-55" wo="0.0135739" />
-    <nuclide name="Si-28" wo="0.006234853554" />
-    <nuclide name="Si-29" wo="0.000328078746" />
-    <nuclide name="Si-30" wo="0.0002239677" />
-    <nuclide name="Cr-50" wo="0.005382452306" />
-    <nuclide name="Cr-52" wo="0.107931450781" />
-    <nuclide name="Cr-53" wo="0.012474806806" />
-    <nuclide name="Cr-54" wo="0.003163190107" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Top of Fuel Assemblies -->
-  <material id="11">
-    <density value="3.044" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0162913" />
-    <nuclide name="O-16"  wo="0.1292776" />
-    <nuclide name="B-10"  wo="5.25228e-5" />
-    <nuclide name="B-11"  wo="2.39272e-4" />
-    <nuclide name="Zr-90" wo="0.43313403903" />
-    <nuclide name="Zr-91" wo="0.09549277374" />
-    <nuclide name="Zr-92" wo="0.14759527104" />
-    <nuclide name="Zr-94" wo="0.15280552077" />
-    <nuclide name="Zr-96" wo="0.02511169542" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-  <!-- Bottom of Fuel Assemblies -->
-  <material id="12">
-    <density value="1.762" units="g/cm3" />
-    <nuclide name="H-1"   wo="0.0292856" />
-    <nuclide name="O-16"  wo="0.2323919" />
-    <nuclide name="B-10"  wo="9.44159e-5" />
-    <nuclide name="B-11"  wo="4.30120e-4" />
-    <nuclide name="Zr-90" wo="0.3741373658" />
-    <nuclide name="Zr-91" wo="0.0824858164" />
-    <nuclide name="Zr-92" wo="0.1274914944" />
-    <nuclide name="Zr-94" wo="0.1319920622" />
-    <nuclide name="Zr-96" wo="0.0216912612" />
-    <sab name="HH2O" xs="71t" />
-  </material>
-
-</materials>
diff --git a/tests/test_score_delayed_nufission/results_true.dat b/tests/test_score_delayed_nufission/results_true.dat
index 6818f88e49..d797baf18c 100644
--- a/tests/test_score_delayed_nufission/results_true.dat
+++ b/tests/test_score_delayed_nufission/results_true.dat
@@ -1,29 +1,29 @@
 k-combined:
-1.005983E+00 2.248579E-02
+9.903196E-01 4.279617E-02
 tally 1:
-1.432292E-02
-4.518762E-05
+1.711611E-02
+5.967549E-05
 0.000000E+00
 0.000000E+00
 0.000000E+00
 0.000000E+00
-1.531359E-02
-5.079909E-05
+1.026930E-02
+2.198717E-05
 tally 2:
-1.576415E-02
-2.485084E-04
 0.000000E+00
 0.000000E+00
 0.000000E+00
 0.000000E+00
 0.000000E+00
 0.000000E+00
+1.976462E-02
+1.953328E-04
 tally 3:
-1.369800E-02
-3.974018E-05
+1.687894E-02
+5.776176E-05
 0.000000E+00
 0.000000E+00
 0.000000E+00
 0.000000E+00
-1.447073E-02
-4.579588E-05
+1.061803E-02
+2.308636E-05
diff --git a/tests/test_score_delayed_nufission/settings.xml b/tests/test_score_delayed_nufission/settings.xml
deleted file mode 100644
index 517637a59f..0000000000
--- a/tests/test_score_delayed_nufission/settings.xml
+++ /dev/null
@@ -1,19 +0,0 @@
-<?xml version="1.0"?>
-<settings>
-
-  <eigenvalue>
-    <batches>10</batches>
-    <inactive>5</inactive>
-    <particles>100</particles>
-  </eigenvalue>
-
-  <source>
-    <space type="box">
-      <parameters>
-        -160 -160 -183
-         160  160  183
-      </parameters>
-    </space>
-  </source>
-
-</settings>
diff --git a/tests/test_score_delayed_nufission/tallies.xml b/tests/test_score_delayed_nufission/tallies.xml
deleted file mode 100644
index 5ca1409859..0000000000
--- a/tests/test_score_delayed_nufission/tallies.xml
+++ /dev/null
@@ -1,21 +0,0 @@
-<?xml version="1.0"?>
-<tallies>
-
-  <tally id="1">
-    <filter type="cell" bins="21 22 23 27" />
-    <scores>delayed-nu-fission</scores>
-  </tally>
-
-  <tally id="2">
-    <filter type="cell" bins="21 22 23 27" />
-    <scores>delayed-nu-fission</scores>
-    <estimator>analog</estimator>
-  </tally>
-
-  <tally id="3">
-    <filter type="cell" bins="21 22 23 27" />
-    <scores>delayed-nu-fission</scores>
-    <estimator>collision</estimator>
-  </tally>
-
-</tallies>
diff --git a/tests/test_score_delayed_nufission/test_score_delayed_nufission.py b/tests/test_score_delayed_nufission/test_score_delayed_nufission.py
index 1777db993e..0738520e29 100644
--- a/tests/test_score_delayed_nufission/test_score_delayed_nufission.py
+++ b/tests/test_score_delayed_nufission/test_score_delayed_nufission.py
@@ -1,10 +1,32 @@
 #!/usr/bin/env python
 
+import os
 import sys
-sys.path.insert(0, '..')
-from testing_harness import TestHarness
+sys.path.insert(0, os.pardir)
+from testing_harness import TestHarness, PyAPITestHarness
+import openmc
+
+
+class ScoreDelayedNuFissionTestHarness(PyAPITestHarness):
+    def _build_inputs(self):
+        filt = openmc.Filter(type='cell', bins=(21, 22, 23, 27))
+        tallies = [openmc.Tally(tally_id=i) for i in range(1, 4)]
+        [t.add_filter(filt) for t in tallies]
+        [t.add_score('delayed-nu-fission') for t in tallies]
+        tallies[0].estimator = 'tracklength'
+        tallies[1].estimator = 'analog'
+        tallies[2].estimator = 'collision'
+        self._input_set.tallies = openmc.TalliesFile()
+        [self._input_set.tallies.add_tally(t) for t in tallies]
+
+        super(ScoreDelayedNuFissionTestHarness, self)._build_inputs()
+
+    def _cleanup(self):
+        super(ScoreDelayedNuFissionTestHarness, self)._cleanup()
+        f = os.path.join(os.getcwd(), 'tallies.xml')
+        if os.path.exists(f): os.remove(f)
 
 
 if __name__ == '__main__':
-    harness = TestHarness('statepoint.10.*', True)
+    harness = ScoreDelayedNuFissionTestHarness('statepoint.10.*', True)
     harness.main()