diff --git a/src/testdir/test100.ok b/src/testdir/test100.ok
new file mode 100644
index 0000000..95b3184
--- /dev/null
+++ b/src/testdir/test100.ok
@@ -0,0 +1,41 @@
+ONE: expecting global undolevels: 5, local undolevels: -123456 (default)
+1
+2
+3
+4
+5
+6
+7
+
+
+  undolevels=5 global
+  undolevels=-123456 local
+TWO: expecting global undolevels: 5, local undolevels: 2 (first) then 10 (afterwards)
+1
+2
+3
+4
+5
+6
+7
+8
+9
+10
+
+
+  undolevels=5 global
+  undolevels=2 local
+
+  undolevels=5 global
+  undolevels=10 local
+
+global value shouldn't be changed and still be 5!
+ONE: expecting global undolevels: 5, local undolevels: -123456 (default)
+  undolevels=5 global
+  undolevels=-123456 local
+
+global value should be changed to 50
+THREE: expecting global undolevels: 50, local undolevels: -123456 (default)
+
+  undolevels=50 global
+  undolevels=-123456 local