diff --git a/js/js.translator/testData/kotlin_lib.js b/js/js.translator/testData/kotlin_lib.js
index 0e9d42c1081..acfac5fbfb2 100644
--- a/js/js.translator/testData/kotlin_lib.js
+++ b/js/js.translator/testData/kotlin_lib.js
@@ -546,6 +546,11 @@
             },
             isEmpty: function () {
                 return this.start > this.end;
+            },
+            equals_za3rmp$: function(other) {
+                if (other == null)
+                    return false;
+                return this.start === other.start && this.end === other.end && this.increment === other.increment;
             }
     });