diff --git a/geom_test.go b/geom_test.go
index 8cecf03b9..176d3f4fc 100644
--- a/geom_test.go
+++ b/geom_test.go
@@ -140,49 +140,47 @@ func TestGeoMApply(t *testing.T) {
 	cpx.Translate(-2, -3)
 
 	cases := []struct {
-		GeoM  GeoM
-		InX   float64
-		InY   float64
-		OutX  float64
-		OutY  float64
-		Delta float64
+		GeoM GeoM
+		InX  float64
+		InY  float64
+		OutX float64
+		OutY float64
 	}{
 		{
-			GeoM:  GeoM{},
-			InX:   3.14159,
-			InY:   2.81828,
-			OutX:  3.14159,
-			OutY:  2.81828,
-			Delta: 0.00001,
+			GeoM: GeoM{},
+			InX:  3.14159,
+			InY:  2.81828,
+			OutX: 3.14159,
+			OutY: 2.81828,
 		},
 		{
-			GeoM:  trans,
-			InX:   3.14159,
-			InY:   2.81828,
-			OutX:  4.14159,
-			OutY:  4.81828,
-			Delta: 0.00001,
+			GeoM: trans,
+			InX:  3.14159,
+			InY:  2.81828,
+			OutX: 4.14159,
+			OutY: 4.81828,
 		},
 		{
-			GeoM:  scale,
-			InX:   3.14159,
-			InY:   2.81828,
-			OutX:  4.71239,
-			OutY:  7.04570,
-			Delta: 0.00001,
+			GeoM: scale,
+			InX:  3.14159,
+			InY:  2.81828,
+			OutX: 4.71239,
+			OutY: 7.04570,
 		},
 		{
-			GeoM:  cpx,
-			InX:   3.14159,
-			InY:   2.81828,
-			OutX:  -6.71239,
-			OutY:  -10.04570,
-			Delta: 0.00001,
+			GeoM: cpx,
+			InX:  3.14159,
+			InY:  2.81828,
+			OutX: -6.71239,
+			OutY: -10.04570,
 		},
 	}
+
+	const delta = 0.00001
+
 	for _, c := range cases {
 		rx, ry := c.GeoM.Apply(c.InX, c.InY)
-		if math.Abs(rx-c.OutX) > c.Delta || math.Abs(ry-c.OutY) > c.Delta {
+		if math.Abs(rx-c.OutX) > delta || math.Abs(ry-c.OutY) > delta {
 			t.Errorf("%s.Apply(%f, %f) = (%f, %f), want (%f, %f)", geoMToString(c.GeoM), c.InX, c.InY, rx, ry, c.OutX, c.OutY)
 		}
 	}