diff --git a/src/test/java/sig/oss/GraderTest.java b/src/test/java/sig/oss/GraderTest.java
index a3f94ee..5289174 100644
--- a/src/test/java/sig/oss/GraderTest.java
+++ b/src/test/java/sig/oss/GraderTest.java
@@ -11,4 +11,10 @@ public void testGradeA() {
 
 	} //just test
 
+	@Test
+	public void testGradeB() {
+		Grade g = Grader.calculate_grade(35,30);
+		assertEquals(Grade.A, g);
+
+	}
 }