JDK-8060192: Add A[] Collection.toArray(IntFunction<A[]>) [#380]

Author: stefan-zobel

src/main/java/org/openjdk/tests/java/util/MOAT.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -98,6 +98,7 @@
 import java.lang.reflect.Method;
 
 import java9.lang.Integers;
+import java9.util.J8Arrays;
 import java9.util.Lists;
 import java9.util.Maps;
 import java9.util.Objects;
@@ -339,6 +340,7 @@ private static <T> void testEmptyCollection(Collection<T> c) {
         equal(c.toString(),"[]");
         equal(c.toArray().length, 0);
         equal(c.toArray(new Object[0]).length, 0);
+        equal(J8Arrays.toArray((Collection<Object>) c, Object[]::new).length, 0);
         check(c.toArray(new Object[]{42})[0] == null);
 
         Object[] a = new Object[1]; a[0] = Boolean.TRUE;
@@ -616,6 +618,13 @@ private static void checkFunctionalInvariants(Collection<Integer> c) {
                 check(a.getClass() == Integer[].class);
             }
 
+            {
+                Integer[] a = J8Arrays.toArray(c, Integer[]::new);
+                equal(c.size(), a.length);
+                check(a.getClass() == Integer[].class);
+                check(Arrays.equals(c.toArray(new Integer[0]), a));
+            }
+
             check(c.equals(c));
             if (c instanceof Serializable) {
                 //System.out.printf("Serializing %s%n", c.getClass().getName());