diff --git a/app/src/test/java/info/nightscout/utils/RoundTest.java b/app/src/test/java/info/nightscout/utils/RoundTest.java
index d95ab2b391..1a801d2a7d 100644
--- a/app/src/test/java/info/nightscout/utils/RoundTest.java
+++ b/app/src/test/java/info/nightscout/utils/RoundTest.java
@@ -14,18 +14,21 @@ public class RoundTest {
     public void roundToTest() throws Exception {
         assertEquals( 0.55d, Round.roundTo(0.54d, 0.05d), 0.00000001d );
         assertEquals( 1d, Round.roundTo(1.49d, 1d), 0.00000001d );
+        assertEquals( 0d, Round.roundTo(0d, 1d), 0.00000001d );
     }
 
     @Test
     public void floorToTest() throws Exception {
         assertEquals( 0.5d, Round.floorTo(0.54d, 0.05d), 0.00000001d );
         assertEquals( 1d, Round.floorTo(1.59d, 1d), 0.00000001d );
+        assertEquals( 0d, Round.floorTo(0d, 1d), 0.00000001d );
     }
 
     @Test
     public void ceilToTest() throws Exception {
         assertEquals( 0.6d, Round.ceilTo(0.54d, 0.1d), 0.00000001d );
         assertEquals( 2d, Round.ceilTo(1.49999d, 1d), 0.00000001d );
+        assertEquals( 0d, Round.ceilTo(0d, 1d), 0.00000001d );
     }
 
 }
\ No newline at end of file