diff --git a/js/js.translator/testData/kotlin_lib.js b/js/js.translator/testData/kotlin_lib.js
index 0c4b543e5d1..a5c9c72c97b 100644
--- a/js/js.translator/testData/kotlin_lib.js
+++ b/js/js.translator/testData/kotlin_lib.js
@@ -481,7 +481,10 @@
                 return value;
             },
             hasNext: function () {
-                return this.i <= this.end;
+                if (this.increment > 0)
+                    return this.i <= this.end;
+                else
+                    return this.i >= this.end;
             }
     });
 
@@ -495,11 +498,11 @@
                 return this.start <= number && number <= this.end;
             },
             iterator: function () {
-                return new Kotlin.RangeIterator(this.start, this.end);
+                return new Kotlin.RangeIterator(this.start, this.end, this.increment);
             }
     });
 
-    Kotlin.Progression = Kotlin.createClassNow(null,
+    Kotlin.NumberProgression = Kotlin.createClassNow(null,
         function (start, end, increment) {
             this.start = start;
             this.end = end;