diff --git a/js/js.libraries/src/core/javautil.kt b/js/js.libraries/src/core/javautil.kt
index 65c60678e80..247eaed8ac1 100644
--- a/js/js.libraries/src/core/javautil.kt
+++ b/js/js.libraries/src/core/javautil.kt
@@ -17,7 +17,7 @@ public trait Iterator<T> {
     open fun remove() : Unit = js.noImpl
 }
 
-/*
+
 val Collections = object {
     library("collectionsMax")
     public fun max<T>(col : Collection<T>, comp : Comparator<T>) : T = js.noImpl
@@ -52,7 +52,7 @@ val Collections = object {
             list[i2] = tmp
         }
     }
-}*/
+}
 
 library
 public open class ArrayList<E>() : java.util.List<E> {
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java
index 44e16882ff6..25f84dd6c1e 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestToJSTest.java
@@ -20,8 +20,7 @@ import org.jetbrains.k2js.config.EcmaVersion;
 
 /**
  */
-//TODO
-public abstract class StdLibTestToJSTest extends StdLibTestSupport {
+public class StdLibTestToJSTest extends StdLibTestSupport {
     public void testGenerateTestCase() throws Exception {
         generateJavaScriptFiles(EcmaVersion.all(),
                                 "libraries/stdlib/test",
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java
index bc265facf60..ec65f37b2ea 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibToJSTest.java
@@ -20,8 +20,7 @@ import org.jetbrains.k2js.config.EcmaVersion;
 
 /**
  */
-//TODO
-public abstract class StdLibToJSTest extends StdLibTestSupport {
+public class StdLibToJSTest extends StdLibTestSupport {
 
     public void testCompileJavaScriptFiles() throws Exception {
         generateJavaScriptFiles(EcmaVersion.all(),