diff --git a/src/testdir/test_increment.ok b/src/testdir/test_increment.ok
index 03a10cb..6ca0acc 100644
--- a/src/testdir/test_increment.ok
+++ b/src/testdir/test_increment.ok
@@ -184,7 +184,81 @@
 1 0
 
 
+# Test 13
+S13====
+max: 100px
+max: 200px
+max: 300px
+max: 400px
+E13====
 
+max: 110px
+max: 210px
+max: 310px
+max: 400px
+
+max: 90px
+max: 190px
+max: 290px
+max: 400px
+
+# Test 14
+S14====
+1 1
+1 1
+E14====
+
+2 2
+2 2
+
+
+# Test 15
+S15====
+101
+E15====
+
+111
+
+
+# Test 16
+S16====
+   1
+  19
+ 119
+E16====
+
+   2
+  20
+ 120
+
+
+# Test 17
+S17====
+ 100
+ 1
+
+ 100
+ 1
+E17====
+
+ 101
+ 2
+
+ 101
+ 1
+
+# Test 18
+S18====
+0
+0
+0
+0
+E18====
+
+3
+6
+9
+12