diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibArraysTest.java b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibArraysTest.java
deleted file mode 100644
index bdc81445737..00000000000
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibArraysTest.java
+++ /dev/null
@@ -1,26 +0,0 @@
-/*
- * Copyright 2010-2015 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.jetbrains.kotlin.js.test.semantics;
-
-import junit.framework.Test;
-
-@SuppressWarnings("JUnitTestCaseWithNoTests")
-public final class StdLibArraysTest extends JsUnitTestBase {
-    public static Test suite() throws Exception {
-        return createTestSuiteForFile("libraries/stdlib/test/collections/ArraysTest.kt");
-    }
-}
diff --git a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibTestToJSTest.java b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibTestToJSTest.java
index 692fb9d4eae..a0c13ab0d62 100644
--- a/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibTestToJSTest.java
+++ b/js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/StdLibTestToJSTest.java
@@ -39,6 +39,7 @@ public class StdLibTestToJSTest extends StdLibQUnitTestSupport {
                           "dom/DomTest.kt",
                           "collections/SequenceTest.kt",
                           "collections/IterableTests.kt",
+                          "collections/ArraysTest.kt",
                           "language/RangeTest.kt",
                           "language/RangeIterationTest.kt"
         );
diff --git a/libraries/stdlib/test/collections/CollectionTest.kt b/libraries/stdlib/test/collections/CollectionTest.kt
index b33dd6f24eb..5e2d47129ac 100644
--- a/libraries/stdlib/test/collections/CollectionTest.kt
+++ b/libraries/stdlib/test/collections/CollectionTest.kt
@@ -658,18 +658,3 @@ class CollectionTest {
         assertEquals("[1, a, null, ${Long.MAX_VALUE.toString()}]", listOf(1, "a", null, Long.MAX_VALUE).toString())
     }
 }
-
-fun <T> Iterable<T>.assertSorted(isInOrder: (T, T) -> Boolean): Unit { this.iterator().assertSorted(isInOrder) }
-fun <T> Iterator<T>.assertSorted(isInOrder: (T, T) -> Boolean) {
-    if (!hasNext()) return
-    var index = 0
-    var prev = next()
-    while (hasNext()) {
-        index += 1
-        val next = next()
-        assertTrue(isInOrder(prev, next), "Not in order at position $index, element[${index-1}]: $prev, element[$index]: $next")
-        prev = next
-    }
-    return
-}
-
diff --git a/libraries/stdlib/test/collections/IterableTests.kt b/libraries/stdlib/test/collections/IterableTests.kt
index 60ea5810072..c346b4e4ede 100644
--- a/libraries/stdlib/test/collections/IterableTests.kt
+++ b/libraries/stdlib/test/collections/IterableTests.kt
@@ -350,3 +350,19 @@ abstract class IterableTests<T : Iterable<String>>(val data: T, val empty: T) {
     }
 
 }
+
+
+fun <T> Iterable<T>.assertSorted(isInOrder: (T, T) -> Boolean): Unit { this.iterator().assertSorted(isInOrder) }
+fun <T> Iterator<T>.assertSorted(isInOrder: (T, T) -> Boolean) {
+    if (!hasNext()) return
+    var index = 0
+    var prev = next()
+    while (hasNext()) {
+        index += 1
+        val next = next()
+        assertTrue(isInOrder(prev, next), "Not in order at position $index, element[${index-1}]: $prev, element[$index]: $next")
+        prev = next
+    }
+    return
+}
+