diff --git a/src/karax.nim b/src/karax.nim
index 0be777a..147965c 100644
--- a/src/karax.nim
+++ b/src/karax.nim
@@ -282,7 +282,7 @@ proc diff(newNode, oldNode: VNode; parent, current: Node; kxi: KaraxInstance): E
     echo "newNode ", newNode.kind, " oldNode ", oldNode.kind, " eq ", eq(newNode, oldNode)
     if oldNode.kind == VNodeKind.text:
       echo oldNode.text
-    return
+    #return
     #doAssert false, "overflow!"
   inc kxi.recursion
   result = eq(newNode, oldNode)
@@ -315,7 +315,7 @@ proc diff(newNode, oldNode: VNode; parent, current: Node; kxi: KaraxInstance): E
       let r = if isSpecial:
                 diff(a[i], b[j], parent, current, kxi)
               else:
-                (assert j < current.len;
+                (assert same(b, current); #(j < current.len, "j: " & $j & " len " & $current.len);
                 diff(a[i], b[j], current, current.childNodes[j], kxi))
       case r
       of identical, changed, similar:
@@ -327,7 +327,7 @@ proc diff(newNode, oldNode: VNode; parent, current: Node; kxi: KaraxInstance): E
       of different:
         # undo what 'diff' would have done:
         kxi.patchLen = oldLen
-        #if result != different: result = r
+        if result != different: result = r
         break
     # compute common prefix:
     while commonPrefix < minLength:
@@ -341,7 +341,6 @@ proc diff(newNode, oldNode: VNode; parent, current: Node; kxi: KaraxInstance): E
       eqAndUpdate(newNode, newPos, oldNode, oldPos, cstring"suffix"):
         dec oldPos
         dec newPos
-        echo "came here"
 
     let pos = min(oldPos, newPos) + 1
     # now the different children are in commonPrefix .. pos - 1:
diff --git a/tests/difftest.nim b/tests/difftest.nim
index 52b354f..8bd4d0f 100644
--- a/tests/difftest.nim
+++ b/tests/difftest.nim
@@ -19,15 +19,18 @@ proc shortRepr(n: VNode): string =
     for i in 0..<n.len:
       result &= " " & shortRepr(n[i])
 
+var err = 0
+
 proc doDiff(a, b: VNode; expected: varargs[string]) =
   discard diff(b, a, nil, vnodeToDom(a, kxi), kxi)
   for i in 0..<kxi.patchLen:
     let p = $kxi.patches[i].k & " " & shortRepr(kxi.patches[i].n)
-    echo "got ", p
     if i >= expected.len:
       echo "patches differ; expected nothing but got: ", p
+      inc err
     elif p != expected[i]:
       echo "patches differ; expected ", expected[i], " but got: ", p
+      inc err
   #hasDom(kxi.currentTree)
   kxi.patchLen = 0
 
@@ -53,7 +56,24 @@ proc testInsert() =
       li: text "A"
       li: text "B"
       li: text "C"
-  doDiff(a, b, "pkInsert li B")
+  doDiff(a, b, "pkInsertBefore li B")
+
+proc testInsert2() =
+  let a = buildHtml(tdiv):
+    tdiv:
+      tdiv:
+        ul:
+          li: text "A"
+          li: text "D"
+  let b = buildHtml(tdiv):
+    tdiv:
+      tdiv:
+        ul:
+          li: text "A"
+          li: text "B"
+          li: text "C"
+          li: text "D"
+  doDiff(a, b, "pkInsertBefore li B", "pkInsertBefore li C")
 
 proc testDelete() =
   let a = buildHtml(tdiv):
@@ -70,6 +90,11 @@ proc testDelete() =
 
 kxi = KaraxInstance(rootId: cstring"ROOT", renderer: proc (): VNode = discard)
 
-#testAppend()
+testAppend()
 testInsert()
-#testDelete()
+testInsert2()
+testDelete()
+if err == 0:
+  echo "Success"
+else:
+  quit 1
diff --git a/tests/tester.nim b/tests/tester.nim
index 4f2ae66..60a787b 100644
--- a/tests/tester.nim
+++ b/tests/tester.nim
@@ -13,5 +13,6 @@ proc main =
   exec("nim js examples/scrollapp/scrollapp.nim")
   exec("nim js examples/mediaplayer/playerapp.nim")
   exec("nim js examples/carousel/carousel.nim")
+  exec("nim js -d:nodejs -r tests/difftest.nim")
 
 main()