diff --git a/tests/regression_tests/implicit/diamond/test.py b/tests/regression_tests/implicit/diamond/test.py
index 82cc918d7b..ec29a809e4 100644
--- a/tests/regression_tests/implicit/diamond/test.py
+++ b/tests/regression_tests/implicit/diamond/test.py
@@ -7,7 +7,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_diamond_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  5.0)
@@ -44,6 +44,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_diamond(implicit_diamond_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_diamond_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/fuel_graded/test.py b/tests/regression_tests/implicit/fuel_graded/test.py
index cb7ce70f4d..3acd926248 100644
--- a/tests/regression_tests/implicit/fuel_graded/test.py
+++ b/tests/regression_tests/implicit/fuel_graded/test.py
@@ -8,7 +8,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_fuel_graded_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  1.0)
@@ -47,6 +47,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_fuel_graded(implicit_fuel_graded_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_fuel_graded_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/fuel_graded_no_cache/test.py b/tests/regression_tests/implicit/fuel_graded_no_cache/test.py
index 1fd23787f6..afe755c8d1 100644
--- a/tests/regression_tests/implicit/fuel_graded_no_cache/test.py
+++ b/tests/regression_tests/implicit/fuel_graded_no_cache/test.py
@@ -8,7 +8,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_fuel_graded_nocache_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  1.0)
@@ -47,6 +47,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_fuel_graded_nocache(implicit_fuel_graded_nocache_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_fuel_graded_nocache_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/gyroid/test.py b/tests/regression_tests/implicit/gyroid/test.py
index a778f84657..6bb9ea2778 100644
--- a/tests/regression_tests/implicit/gyroid/test.py
+++ b/tests/regression_tests/implicit/gyroid/test.py
@@ -7,7 +7,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_gyroid_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  5.0)
@@ -42,6 +42,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_gyroid(implicit_gyroid_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_gyroid_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/primitive/test.py b/tests/regression_tests/implicit/primitive/test.py
index a8915558d3..50860b77ac 100644
--- a/tests/regression_tests/implicit/primitive/test.py
+++ b/tests/regression_tests/implicit/primitive/test.py
@@ -7,7 +7,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_primitive_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  5.0)
@@ -42,6 +42,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_primitive(implicit_primitive_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_primitive_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/sphere_classic/test.py b/tests/regression_tests/implicit/sphere_classic/test.py
index 1339dfff93..9107096463 100644
--- a/tests/regression_tests/implicit/sphere_classic/test.py
+++ b/tests/regression_tests/implicit/sphere_classic/test.py
@@ -7,7 +7,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def classic_sphere_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235', 1.0)
@@ -34,6 +34,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_classic_sphere(classic_sphere_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=classic_sphere_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/square_circle_fit/test.py b/tests/regression_tests/implicit/square_circle_fit/test.py
index 8a86108160..9e4e5577d8 100644
--- a/tests/regression_tests/implicit/square_circle_fit/test.py
+++ b/tests/regression_tests/implicit/square_circle_fit/test.py
@@ -8,7 +8,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_square_circle_fit_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  1.0)
@@ -53,6 +53,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_square_circle_fit(implicit_square_circle_fit_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_square_circle_fit_model)
     harness.main()
\ No newline at end of file
diff --git a/tests/regression_tests/implicit/squircle/test.py b/tests/regression_tests/implicit/squircle/test.py
index c719d4f302..19d17ebe0b 100644
--- a/tests/regression_tests/implicit/squircle/test.py
+++ b/tests/regression_tests/implicit/squircle/test.py
@@ -8,7 +8,7 @@ from tests.testing_harness import PyAPITestHarness
  
  
 @pytest.fixture()
-def implicit_sphere_model():
+def implicit_squircle_model():
     # Material
     material = openmc.Material()
     material.add_nuclide('U235',  1.0)
@@ -51,6 +51,6 @@ def implicit_sphere_model():
     return model
  
  
-def test_implicit_sphere(implicit_sphere_model):
-    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_sphere_model)
+def test_implicit_squircle(implicit_squircle_model):
+    harness = PyAPITestHarness('statepoint.20.h5', model=implicit_squircle_model)
     harness.main()
\ No newline at end of file