diff --git a/tests/unit/geometry/test_vec.py b/tests/unit/geometry/test_vec.py
index a587270ec..b9fa9ad05 100644
--- a/tests/unit/geometry/test_vec.py
+++ b/tests/unit/geometry/test_vec.py
@@ -12,6 +12,8 @@
 some_int = 42
 
 vec3d = Vec3D(1.0, 2.0, 3.0)
+vec3d_fp1 = Vec3D(0.1, 0.6 / 3.0, 0.1 + 0.2)
+vec3d_fp2 = Vec3D(0.1, 0.2, 0.3)
 vec3d_neg = Vec3D(-1.0, -2.0, -3.0)
 vec3d_lg = Vec3D(1.5, 2.5, 3.5)
 vec3d_mx = Vec3D(0.5, 2.5, 3.0)
@@ -172,6 +174,10 @@ def test_neg():
     assert vec3d == -vec3d_neg
 
 
+def test_round():
+    assert round(vec3d_fp1, 8) == vec3d_fp2
+
+
 @pytest.mark.parametrize(
     "arg1, arg2, fname, dtype",
     [
@@ -346,6 +352,7 @@ def test_inference_return_int3d(x: Vec3D[int]):
         some_int * intvec3d,
         some_int // intvec3d,
         some_int % intvec3d,
+        round(intvec3d),
     ]:
 
         test_inference_return_int3d(x)
@@ -402,5 +409,6 @@ def test_inference_return_vec3d(x: Vec3D):
         some_float // intvec3d,
         some_float / intvec3d,
         some_float % intvec3d,
+        round(vec3d),
     ]:
         test_inference_return_vec3d(y)