diff --git a/src/testdir/test_increment.ok b/src/testdir/test_increment.ok
new file mode 100644
index 0000000..4a61ad1
--- /dev/null
+++ b/src/testdir/test_increment.ok
@@ -0,0 +1,66 @@
+# Test 1
+S1======
+foobar-10
+E1======
+
+foobar-9
+foobar-9
+foobar-11
+foobar-11
+foobar-9
+
+
+# Test 2
+S2=====
+10
+20
+30
+40
+E2=====
+
+11
+21
+31
+41
+
+9
+19
+29
+39
+
+# Test 3
+S3=====
+10
+
+20
+
+30
+
+40
+E3=====
+
+12
+
+24
+
+36
+
+48
+
+8
+
+16
+
+24
+
+32
+
+# Test 4
+S4=====
+foobar-10
+E4=====
+
+foobar-10
+
+ENDTEST
+