diff --git a/libraries/stdlib/src/JavaUtil.kt b/libraries/stdlib/src/JavaUtil.kt
index aedb127fd14..bb9798f7b52 100644
--- a/libraries/stdlib/src/JavaUtil.kt
+++ b/libraries/stdlib/src/JavaUtil.kt
@@ -53,7 +53,7 @@ inline fun <in T: java.lang.Comparable<T>> List<T>.sort() : List<T> {
   return this
 }
 
-inline fun <in T: java.lang.Comparable<T>> List<T>.sort(comparator: java.util.Comparator<T>) : List<T> {
+inline fun <in T> List<T>.sort(comparator: java.util.Comparator<T>) : List<T> {
   Collections.sort(this, comparator)
   return this
 }
diff --git a/libraries/stdlib/src/Ordering.kt b/libraries/stdlib/src/Ordering.kt
index 071151890d8..5bb5ca62603 100644
--- a/libraries/stdlib/src/Ordering.kt
+++ b/libraries/stdlib/src/Ordering.kt
@@ -58,9 +58,7 @@ private class FunctionComparator<T>(val functions: Array<Function1<T,Any?>>):  C
     }
 
     override fun compare(o1: T?, o2: T?): Int {
-        // TODO compile error
-        //return compareBy<T>(o1, o2, functions)
-        throw UnsupportedOperationException("TODO")
+        return compareBy<T>(o1, o2, *functions)
     }
 
     override fun equals(obj: Any?): Boolean {
diff --git a/libraries/stdlib/test/CollectionTest.kt b/libraries/stdlib/test/CollectionTest.kt
index d4a48566a14..51e04c7cd47 100644
--- a/libraries/stdlib/test/CollectionTest.kt
+++ b/libraries/stdlib/test/CollectionTest.kt
@@ -2,15 +2,11 @@ package test.collections
 
 import kotlin.test.*
 
-// TODO can we avoid importing all this stuff by default I wonder?
-// e.g. making println and the collection builder methods public by default?
-import kotlin.*
-import kotlin.io.*
-import kotlin.util.*
 import java.util.*
-import junit.framework.TestCase
 
-class CollectionTest() : TestCase() {
+import org.junit.Test
+
+class CollectionTest {
 
     class IterableWrapper<T>(collection : java.lang.Iterable<T>) : java.lang.Iterable<T> {
         private val collection = collection
@@ -23,7 +19,7 @@ class CollectionTest() : TestCase() {
 
     val data = arrayList("foo", "bar")
 
-    fun testAny() {
+    Test fun any() {
         assertTrue {
             data.any{it.startsWith("f")}
         }
@@ -32,7 +28,7 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testAll() {
+    Test fun all() {
         assertTrue {
             data.all{it.length == 3}
         }
@@ -41,12 +37,12 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testCount() {
+    Test fun count() {
         assertEquals(1, data.count{it.startsWith("b")})
         assertEquals(2, data.count{it.size == 3})
     }
 
-    fun testFilter() {
+    Test fun filter() {
         val foo = data.filter{it.startsWith("f")}
 
         assertTrue {
@@ -56,7 +52,7 @@ class CollectionTest() : TestCase() {
         assertEquals(arrayList("foo"), foo)
     }
 
-    fun testFilterNot() {
+    Test fun filterNot() {
         val foo = data.filterNot{it.startsWith("b")}
 
         assertTrue {
@@ -66,7 +62,7 @@ class CollectionTest() : TestCase() {
         assertEquals(arrayList("foo"), foo)
     }
 
-    fun testFilterIntoLinkedList() {
+    Test fun filterIntoLinkedList() {
         // TODO would be nice to avoid the <String>
         val foo = data.filterTo(linkedList<String>()){it.startsWith("f")}
 
@@ -81,7 +77,7 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testFilterIntoSet() {
+    Test fun filterIntoSet() {
         // TODO would be nice to avoid the <String>
         val foo = data.filterTo(hashSet<String>()){it.startsWith("f")}
 
@@ -96,7 +92,7 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testFilterIntoSortedSet() {
+    Test fun filterIntoSortedSet() {
         // TODO would be nice to avoid the <String>
         val sorted = data.filterTo(sortedSet<String>()){it.length == 3}
         assertEquals(2, sorted.size)
@@ -106,7 +102,7 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testFind() {
+    Test fun find() {
         val x = data.find{it.startsWith("x")}
         assertNull(x)
         fails {
@@ -118,7 +114,7 @@ class CollectionTest() : TestCase() {
         assertEquals("foo", f)
     }
 
-    fun testFlatMap() {
+    Test fun flatMap() {
         val characters = arrayList('f', 'o', 'o', 'b', 'a', 'r')
         // TODO figure out how to get a line like this to compile :)
         /*
@@ -133,13 +129,13 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testForeach() {
+    Test fun foreach() {
         var count = 0
         data.forEach{ count += it.length }
         assertEquals(6, count)
     }
 
-    fun testFold() {
+    Test fun fold() {
         expect(10) {
             val numbers = arrayList(1, 2, 3, 4)
 
@@ -162,7 +158,7 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testFoldRight() {
+    Test fun foldRight() {
         expect("4321") {
             val numbers = arrayList(1, 2, 3, 4)
 
@@ -173,7 +169,7 @@ class CollectionTest() : TestCase() {
     }
 
 
-    fun testGroupBy() {
+    Test fun groupBy() {
         val words = arrayList("a", "ab", "abc", "def", "abcd")
         /*
         TODO inference engine should not need this type info?
@@ -191,12 +187,12 @@ class CollectionTest() : TestCase() {
 
     }
 
-    fun testJoin() {
+    Test fun join() {
         val text = data.join("-", "<", ">")
         assertEquals("<foo-bar>", text)
     }
 
-    fun testMap() {
+    Test fun map() {
         /**
           TODO compiler bug
           we should be able to remove the explicit type on the function
@@ -210,12 +206,12 @@ class CollectionTest() : TestCase() {
         assertEquals(arrayList(3, 3), lengths)
     }
 
-    fun testReverse() {
+    Test fun reverse() {
         val rev = data.reverse()
         assertEquals(arrayList("bar", "foo"), rev)
     }
 
-    fun testSort() {
+    Test fun sort() {
         val coll: List<String> = arrayList("foo", "bar", "abc")
 
         // TODO fixme
@@ -228,7 +224,7 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testToArray() {
+    Test fun toArray() {
         val arr = data.toArray()
         println("Got array ${arr}")
         todo {
@@ -238,26 +234,26 @@ class CollectionTest() : TestCase() {
         }
     }
 
-    fun testSimpleCount() {
+    Test fun simpleCount() {
         assertEquals(2, data.count())
         assertEquals(3, hashSet(12, 14, 15).count())
         assertEquals(0, ArrayList<Double>().count())
     }
 
-    fun testLast() {
+    Test fun last() {
         assertEquals("bar", data.last())
         assertEquals(25, arrayList(15, 19, 20, 25).last())
         // assertEquals(19, TreeSet(arrayList(90, 47, 19)).first())
         assertEquals('a', linkedList('a').last())
     }
 
-    fun testLastException() {
+    Test fun lastException() {
         fails { arrayList<Int>().last() }
         fails { linkedList<String>().last() }
         fails { hashSet<Char>().last() }
     }
 
-    fun testSubscript() {
+    Test fun subscript() {
         val list = arrayList("foo", "bar")
         assertEquals("foo", list[0])
         assertEquals("bar", list[1])
@@ -280,7 +276,7 @@ class CollectionTest() : TestCase() {
         assertEquals(arrayList("new", "thing", "works"), list)
     }
 
-    fun testIndices() {
+    Test fun indices() {
         val indices = data.indices
         assertEquals(0, indices.start)
         assertEquals(1, indices.end)
@@ -288,7 +284,7 @@ class CollectionTest() : TestCase() {
         assertFalse(indices.isReversed)
     }
 
-    fun testContains() {
+    Test fun contains() {
         assertTrue(data.contains("foo"))
         assertTrue(data.contains("bar"))
         assertFalse(data.contains("some"))
diff --git a/libraries/stdlib/test/CompareTest.kt b/libraries/stdlib/test/CompareTest.kt
index 03d6c9d4c85..dde0dbbd4f8 100644
--- a/libraries/stdlib/test/CompareTest.kt
+++ b/libraries/stdlib/test/CompareTest.kt
@@ -1,13 +1,13 @@
-package test
-
-import org.junit.Test
+package test.compare
 
 import kotlin.test.*
+import java.util.*
+import org.junit.Test
 
-class Item(val name: String, val rating: Int)
 
-/**
- */
+class Item(val name: String, val rating: Int) {
+}
+
 class CompareTest {
     val v1 = Item("wine", 9)
     val v2 = Item("beer", 10)
@@ -28,13 +28,16 @@ class CompareTest {
     }
 
     Test fun createComparator() {
-        val c = comparator({(i: Item) -> i.rating}, {(i: Item) -> i.name})
+        val c = comparator<Item>({(i: Item) -> i.rating}, {(i: Item) -> i.name})
         println("Created comparator $c")
-/*
-        val items = arrayList(v1, v2)
-        items.sort(c)
-        println("Sorted list in rating order $items")
-*/
 
+        todo {
+            // TODO needs KT-729 before this code works
+            val diff = c.compare(v1, v2)
+            assertTrue(diff < 0)
+            val items = arrayList(v1, v2)
+            items.sort(c)
+            println("Sorted list in rating order $items")
+        }
     }
 }
\ No newline at end of file
diff --git a/libraries/stdlib/test/ListTest.kt b/libraries/stdlib/test/ListTest.kt
index bb5c5b54fa2..c427d46f647 100644
--- a/libraries/stdlib/test/ListTest.kt
+++ b/libraries/stdlib/test/ListTest.kt
@@ -2,18 +2,12 @@ package test.collections
 
 import kotlin.test.*
 
-// TODO can we avoid importing all this stuff by default I wonder?
-// e.g. making println and the collection builder methods public by default?
-import kotlin.*
-import kotlin.io.*
-import kotlin.util.*
-import java.util.*
-import junit.framework.TestCase
+import org.junit.Test
 
-class ListTest() : TestCase() {
+class ListTest {
   val data = arrayList("foo", "bar")
 
-  fun testHeadAndTail() {
+  Test fun headAndTail() {
     val h = data.head
     assertEquals("foo", h)
 
@@ -21,7 +15,7 @@ class ListTest() : TestCase() {
     assertEquals("bar", t)
   }
 
-  fun testFirstAndLast() {
+  Test fun firstAndLast() {
     val h = data.first
     assertEquals("foo", h)
 
@@ -29,7 +23,7 @@ class ListTest() : TestCase() {
     assertEquals("bar", t)
   }
 
-  fun testWithIndices() {
+  Test fun withIndices() {
     val withIndices = data.withIndices()
     var index = 0
     for (withIndex in withIndices) {
diff --git a/libraries/stdlib/test/SetTest.kt b/libraries/stdlib/test/SetTest.kt
index 4b29b65c417..57211c46892 100644
--- a/libraries/stdlib/test/SetTest.kt
+++ b/libraries/stdlib/test/SetTest.kt
@@ -1,16 +1,13 @@
 package test.collections
 
-import kotlin.*
-import kotlin.io.*
-import kotlin.util.*
 import kotlin.test.*
 import java.util.*
-import junit.framework.TestCase
+import org.junit.Test
 
-class SetTest() : TestCase() {
+class SetTest {
     val data = hashSet("foo", "bar")
 
-    fun testAny() {
+    Test fun any() {
         assertTrue {
             data.any{it.startsWith("f")}
         }
@@ -19,7 +16,7 @@ class SetTest() : TestCase() {
         }
     }
 
-    fun testAll() {
+    Test fun all() {
         assertTrue {
             data.all{it.length == 3}
         }
@@ -28,7 +25,7 @@ class SetTest() : TestCase() {
         }
     }
 
-    fun testFilter() {
+    Test fun filter() {
         val foo = data.filter{it.startsWith("f")}.toSet()
 
         assertTrue {
@@ -42,7 +39,7 @@ class SetTest() : TestCase() {
         }
     }
 
-    fun testFind() {
+    Test fun find() {
         val x = data.find{it.startsWith("x")}
         assertNull(x)
         fails {
@@ -54,7 +51,7 @@ class SetTest() : TestCase() {
         assertEquals("foo", f)
     }
 
-    fun testMap() {
+    Test fun map() {
         /**
           TODO compiler bug
           we should be able to remove the explicit type on the function