diff --git a/test/CDB_JenksBinsTest.sql b/test/CDB_JenksBinsTest.sql
index b8bfbaa..2cc7071 100644
--- a/test/CDB_JenksBinsTest.sql
+++ b/test/CDB_JenksBinsTest.sql
@@ -1,11 +1,19 @@
 WITH data AS (
-    SELECT array_agg(x::numeric) s FROM generate_series(1,300) x
-        WHERE x % 5 != 0 AND x % 7 != 0
-    ) 
-SELECT unnest(CDB_JenksBins(s, 7)) FROM data;
+    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 round(unnest(CDB_JenksBins(s, 5))) FROM data;
 
 WITH data_nulls AS (
-    SELECT array_agg(CASE WHEN x % 2 != 0 THEN x ELSE NULL END::numeric) s FROM generate_series(1,300) x
-        WHERE x % 5 != 0 AND x % 7 != 0
-    )
-SELECT unnest(CDB_JenksBins(s, 7)) FROM data_nulls;
+    SELECT Array[0.99, 1.0, 1.01,
+                 4.99, 5.01,
+                 null, null,
+                 10.01, 10.01,
+                 15.01, 14.99,
+                 null, null,
+                 20.1, 19.9]::numeric[] AS s
+)
+SELECT round(unnest(CDB_JenksBins(s, 5))) FROM data_nulls;
diff --git a/test/CDB_JenksBinsTest_expect b/test/CDB_JenksBinsTest_expect
index 496e6be..98227ed 100644
--- a/test/CDB_JenksBinsTest_expect
+++ b/test/CDB_JenksBinsTest_expect
@@ -1,14 +1,10 @@
-43
-86
-129
-172
-213
-257
-299
-37
-51
-97
-157
-213
-241
-
+1
+5
+10
+15
+20
+1
+5
+10
+15
+20