test/java/util/stream/test/org/openjdk/tests/java/util/stream/StreamSpliteratorTest.java

@@ -322,10 +322,11 @@
     List<Function<Stream<Integer>, Stream<Integer>>> streamFunctions() {
         if (streamFunctions == null) {
             List<Function<Stream<Integer>, Stream<Integer>>> opFunctions = Arrays.asList(
                     s -> s.filter(pEven),
                     s -> s.map(mDoubler),
+                    s -> s.flatMap(x -> Stream.of(x, x)),
                     // @@@ Add distinct once asserting results with or without order
                     //     is correctly supported
 //                    s -> s.distinct(),
                     s -> s.sorted());
 

@@ -418,10 +419,11 @@
     List<Function<IntStream, IntStream>> intStreamFunctions() {
         if (intStreamFunctions == null) {
             List<Function<IntStream, IntStream>> opFunctions = Arrays.asList(
                     s -> s.filter(ipEven),
                     s -> s.map(irDoubler),
+                    s -> s.flatMap(x -> IntStream.of(x, x)),
                     s -> s.sorted());
 
             intStreamFunctions = permuteStreamFunctions(opFunctions);
         }
 

@@ -511,10 +513,11 @@
     List<Function<LongStream, LongStream>> longStreamFunctions() {
         if (longStreamFunctions == null) {
             List<Function<LongStream, LongStream>> opFunctions = Arrays.asList(
                     s -> s.filter(lpEven),
                     s -> s.map(x -> x * 2L),
+                    s -> s.flatMap(x -> LongStream.of(x, x)),
                     s -> s.sorted());
 
             longStreamFunctions = permuteStreamFunctions(opFunctions);
         }
 

@@ -604,10 +607,11 @@
     List<Function<DoubleStream, DoubleStream>> doubleStreamFunctions() {
         if (doubleStreamFunctions == null) {
             List<Function<DoubleStream, DoubleStream>> opFunctions = Arrays.asList(
                     s -> s.filter(dpEven),
                     s -> s.map(x -> x * 2.0),
+                    s -> s.flatMap(x -> DoubleStream.of(x, x)),
                     s -> s.sorted());
 
             doubleStreamFunctions = permuteStreamFunctions(opFunctions);
         }