diff --git a/test/CDB_JenksBinsTest.sql b/test/CDB_JenksBinsTest.sql
index de0dbf4..0f97e1c 100644
--- a/test/CDB_JenksBinsTest.sql
+++ b/test/CDB_JenksBinsTest.sql
@@ -17,4 +17,14 @@ WITH data_nulls AS (
                  null, null,
                  20.1, 19.9]::numeric[] AS s
 )
-SELECT unnest(CDB_JenksBins(s, 5)) FROM data;
+SELECT unnest(CDB_JenksBins(s, 5)) FROM data_nulls;
+
+
+WITH data_inverse AS (
+    SELECT Array[0.99, 1.0, 1.01,
+                 4.99, 5.01,
+                 10.01, 10.01,
+                 15.01, 14.99,
+                 20.1, 19.9]::numeric[] AS s
+)
+SELECT unnest(CDB_JenksBins(s, 5, 0, true)) FROM data_inverse;
diff --git a/test/CDB_JenksBinsTest_expect b/test/CDB_JenksBinsTest_expect
index 0802fec..462c675 100644
--- a/test/CDB_JenksBinsTest_expect
+++ b/test/CDB_JenksBinsTest_expect
@@ -8,4 +8,8 @@
 10.01
 15.01
 20.1
-
+0.99
+4.99
+10.01
+14.99
+19.9