diff --git a/autotest/t075_ugridtests.py b/autotest/t075_test_ugrid.py
similarity index 94%
rename from autotest/t075_ugridtests.py
rename to autotest/t075_test_ugrid.py
index 14fecb01eb..55f96c9a8a 100644
--- a/autotest/t075_ugridtests.py
+++ b/autotest/t075_test_ugrid.py
@@ -291,9 +291,10 @@ def test_voronoi_grid0(plot=False):
 
     vor = VoronoiGrid(tri)
     gridprops = vor.get_gridprops_vertexgrid()
+    ncpl = gridprops["ncpl"]
     assert (
-        gridprops["ncpl"] == answer_ncpl
-    ), "Number of cells should be {answer_ncpl}"
+            ncpl == answer_ncpl
+    ), f"Number of cells should be {answer_ncpl}. Found {ncpl}"
 
     voronoi_grid = VertexGrid(**gridprops, nlay=1)
 
@@ -326,9 +327,10 @@ def test_voronoi_grid1(plot=False):
     vor = VoronoiGrid(tri)
     gridprops = vor.get_gridprops_vertexgrid()
     voronoi_grid = VertexGrid(**gridprops, nlay=1)
+    ncpl = gridprops["ncpl"]
     assert (
-        gridprops["ncpl"] == answer_ncpl
-    ), "Number of cells should be {answer_ncpl}"
+            ncpl == answer_ncpl
+    ), f"Number of cells should be {answer_ncpl}. Found {ncpl}"
 
     if plot:
         import matplotlib.pyplot as plt
@@ -345,22 +347,23 @@ def test_voronoi_grid1(plot=False):
 def test_voronoi_grid2(plot=False):
 
     name = "vor2"
-    answer_ncpl = 5058
+    answer_ncpl = 538
     theta = np.arange(0.0, 2 * np.pi, 0.2)
     radius = 100.0
     x = radius * np.cos(theta)
     y = radius * np.sin(theta)
     circle_poly = [(x, y) for x, y in zip(x, y)]
-    tri = Triangle(maximum_area=5, angle=30, model_ws=tpth)
+    tri = Triangle(maximum_area=50, angle=30, model_ws=tpth)
     tri.add_polygon(circle_poly)
     tri.build(verbose=False)
 
     vor = VoronoiGrid(tri)
     gridprops = vor.get_gridprops_vertexgrid()
     voronoi_grid = VertexGrid(**gridprops, nlay=1)
+    ncpl = gridprops["ncpl"]
     assert (
-        gridprops["ncpl"] == answer_ncpl
-    ), "Number of cells should be {answer_ncpl}"
+            ncpl == answer_ncpl
+    ), f"Number of cells should be {answer_ncpl}. Found {ncpl}"
 
     if plot:
         import matplotlib.pyplot as plt
@@ -377,7 +380,7 @@ def test_voronoi_grid2(plot=False):
 def test_voronoi_grid3(plot=False):
 
     name = "vor3"
-    answer_ncpl = 2375
+    answer_ncpl = 300
 
     theta = np.arange(0.0, 2 * np.pi, 0.2)
     radius = 100.0
@@ -391,7 +394,7 @@ def test_voronoi_grid3(plot=False):
     y = radius * np.sin(theta) + 25.0
     inner_circle_poly = [(x, y) for x, y in zip(x, y)]
 
-    tri = Triangle(maximum_area=10, angle=30, model_ws=tpth)
+    tri = Triangle(maximum_area=100, angle=30, model_ws=tpth)
     tri.add_polygon(circle_poly)
     tri.add_polygon(inner_circle_poly)
     tri.add_hole((25, 25))
@@ -400,9 +403,10 @@ def test_voronoi_grid3(plot=False):
     vor = VoronoiGrid(tri)
     gridprops = vor.get_gridprops_vertexgrid()
     voronoi_grid = VertexGrid(**gridprops, nlay=1)
+    ncpl = gridprops["ncpl"]
     assert (
-        gridprops["ncpl"] == answer_ncpl
-    ), "Number of cells should be {answer_ncpl}"
+            ncpl == answer_ncpl
+    ), f"Number of cells should be {answer_ncpl}. Found {ncpl}"
 
     if plot:
         import matplotlib.pyplot as plt
@@ -435,9 +439,10 @@ def test_voronoi_grid4(plot=False):
     vor = VoronoiGrid(tri)
     gridprops = vor.get_gridprops_vertexgrid()
     voronoi_grid = VertexGrid(**gridprops, nlay=1)
+    ncpl = gridprops["ncpl"]
     assert (
-        gridprops["ncpl"] == answer_ncpl
-    ), "Number of cells should be {answer_ncpl}"
+            ncpl == answer_ncpl
+    ), f"Number of cells should be {answer_ncpl}. Found {ncpl}"
 
     if plot:
         import matplotlib.pyplot as plt
@@ -498,9 +503,10 @@ def test_voronoi_grid5(plot=False):
     vor = VoronoiGrid(tri)
     gridprops = vor.get_gridprops_vertexgrid()
     voronoi_grid = VertexGrid(**gridprops, nlay=1)
+    ncpl = gridprops["ncpl"]
     assert (
-        gridprops["ncpl"] == answer_ncpl
-    ), "Number of cells should be {answer_ncpl}"
+        ncpl == answer_ncpl
+    ), f"Number of cells should be {answer_ncpl}. Found {ncpl}"
 
     if plot:
         import matplotlib.pyplot as plt