--- /dev/null	2013-11-18 16:43:35.025865568 -0800
+++ new/test/java/util/DoubleSummaryStatistics/TestDoubleSummaryStatisticsSummation.java	2013-11-19 14:16:51.000000000 -0800
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2013, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.util.*;
+import java.util.stream.*;
+
+/*
+ * @test
+ * @bug 8006572
+ */
+public class TestDoubleSummaryStatisticsSummation {
+    public static void main(String... args) {
+        double base = 1.0;
+        double increment = Math.ulp(base)/2.0;
+        int count = 1_000_001;
+        /*
+         * The exact sum of this stream is 1 + 1e6*ulp(1.0) but a
+         * naive summation algorithm will return 1.0 since (1.0 +
+         * ulp(1.0)/2) will round to 1.0 again.
+         */
+        TestDoubleIterator tdi = new TestDoubleIterator(base,
+                                                        increment,
+                                                        count);
+        DoubleSummaryStatistics stats =
+            StreamSupport.doubleStream(Spliterators.spliteratorUnknownSize(tdi,
+                                                                           Spliterator.IMMUTABLE |
+                                                                           Spliterator.NONNULL),
+                                       false).collect(DoubleSummaryStatistics::new,
+                                                      DoubleSummaryStatistics::accept,
+                                                      DoubleSummaryStatistics::combine);
+
+        double expectedSum = base + (increment * (count - 1));
+        compareUlpDifference(expectedSum, stats.getSum(), 3);
+
+        double expectedAvg = expectedSum / count;
+        compareUlpDifference(expectedAvg, stats.getAverage(), 3);
+    }
+
+    private static void compareUlpDifference(double expected, double computed, double threshold) {
+        double ulpDifference = Math.abs(expected - computed) / Math.ulp(expected);
+
+        if (ulpDifference > threshold) {
+            System.out.printf("Numerical summation error too large, %g ulps rather than %g.%n",
+                              ulpDifference, threshold);
+            throw new RuntimeException();
+        }
+
+    }
+
+    static class TestDoubleIterator implements PrimitiveIterator.OfDouble {
+        private double base;
+        private double subsequent;
+        private long count;
+        private long iteration = 0;
+
+        /**
+         * Construct a {@code TestDoubleStream} of {@code count}
+         * elements whose first value is {@code base} and whose
+         * following values are all {@code subsequent}.
+         */
+        TestDoubleIterator(double base, double subsequent, long count) {
+            this.base = base;
+            this.subsequent = subsequent;
+            this.count = count;
+        }
+
+        @Override
+        public boolean hasNext() {
+            return (iteration < count);
+        }
+
+        @Override
+        public double nextDouble() {
+            if (iteration >= count)
+                throw new NoSuchElementException();
+            else {
+                iteration++;
+                return (iteration == 1) ? base : subsequent;
+            }
+        }
+    }
+}