diff --git a/openedx/core/lib/tests/test_grade_utils.py b/openedx/core/lib/tests/test_grade_utils.py
index 4d6dd00912..34c86d6bc0 100644
--- a/openedx/core/lib/tests/test_grade_utils.py
+++ b/openedx/core/lib/tests/test_grade_utils.py
@@ -48,8 +48,14 @@ class TestGradeUtils(TestCase):
 
     @ddt.data(
         (0.5, 1),
+        (1.49, 1),
+        (1.5, 2),
+        (1.51, 2),
+        (2.5, 3),
         (1.45, 1.5, 1),
         (-0.5, -1.0),
+        (-1.5, -2.0),
+        (-2.5, -3.0),
         (-0.1, -0.0),
         (0.1, 0.0),
         (0.0, 0.0)