diff --git a/util/test-10-s.ndb b/util/test-10-s.ndb
new file mode 100644
index 0000000..cf2138c
--- /dev/null
+++ b/util/test-10-s.ndb
@@ -0,0 +1,10 @@
+Lib_Open 0
+DS_Open 1
+Index_List_Open 0-0
+DS_Value_Add 1-10 0
+DS_Value_Find 1-10
+Index_List_To_Tree 0-0
+DS_Value_Find 1-10
+DS_Check
+DS_Close
+Lib_Close
diff --git a/util/test-100K-s.ndb b/util/test-100K-s.ndb
new file mode 100644
index 0000000..5429713
--- /dev/null
+++ b/util/test-100K-s.ndb
@@ -0,0 +1,10 @@
+Lib_Open 0
+DS_Open 1
+Index_List_Open 0-0
+DS_Value_Add 1-100000 0
+DS_Value_Find 49900-50100
+Index_List_To_Tree 0-0
+DS_Value_Find 1-100000
+DS_Check
+DS_Close
+Lib_Close
diff --git a/util/test-10K-s.ndb b/util/test-10K-s.ndb
new file mode 100644
index 0000000..3586b39
--- /dev/null
+++ b/util/test-10K-s.ndb
@@ -0,0 +1,10 @@
+Lib_Open 0
+DS_Open 1
+Index_List_Open 0-0
+DS_Value_Add 1-10000 0
+DS_Value_Find 4000-6000
+Index_List_To_Tree 0-0
+DS_Value_Find 1-10000
+DS_Check
+DS_Close
+Lib_Close
diff --git a/util/test-1M-s.ndb b/util/test-1M-s.ndb
new file mode 100644
index 0000000..87d9c6d
--- /dev/null
+++ b/util/test-1M-s.ndb
@@ -0,0 +1,10 @@
+Lib_Open 0
+DS_Open 1
+Index_List_Open 0-0
+DS_Value_Add 1-1000000 0
+DS_Value_Find 499990-500010
+Index_List_To_Tree 0-0
+DS_Value_Find 1-1000000
+DS_Check
+DS_Close
+Lib_Close