diff --git a/t_iterator_test.go b/t_iterator_test.go
index 250b1e9..00eb8f5 100644
--- a/t_iterator_test.go
+++ b/t_iterator_test.go
@@ -23,6 +23,6 @@ func TestIteratorParser(t *testing.T) {
 		/*  12 */ {`include "test-resources/filter.expr"; it=$(ds,10); it++`, int64(2), nil},
 	}
 
-	runTestSuiteSpec(t, section, inputs, 12)
-	//runTestSuite(t, section, inputs)
+	//runTestSuiteSpec(t, section, inputs, 12)
+	runTestSuite(t, section, inputs)
 }
diff --git a/test-resources/filter.expr b/test-resources/filter.expr
new file mode 100644
index 0000000..75c4b5c
--- /dev/null
+++ b/test-resources/filter.expr
@@ -0,0 +1,15 @@
+ds={
+		"init":func(end){@end=end; @current=0 but true},
+		"current":func(){current},
+		"next":func(){
+			((next=current+1) <= end) ? [true] {@current=next but current} :: {nil}
+		}
+		,		"filter":func(item,index) { item > 0 }
+		,		"map":   func(item,index) { item * 2 }
+}
+
+/* Example
+;
+it=$(ds,3);
+add(it)
+*/