--- jsr166/src/test/tck/DoubleAccumulatorTest.java	2013/03/22 16:10:19	1.2
+++ jsr166/src/test/tck/DoubleAccumulatorTest.java	2017/04/23 03:03:16	1.6
@@ -4,24 +4,35 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-import junit.framework.*;
-import java.util.concurrent.*;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Phaser;
 import java.util.concurrent.atomic.DoubleAccumulator;
 
+import junit.framework.Test;
+import junit.framework.TestSuite;
+
 public class DoubleAccumulatorTest extends JSR166TestCase {
     public static void main(String[] args) {
-        junit.textui.TestRunner.run(suite());
+        main(suite(), args);
     }
     public static Test suite() {
         return new TestSuite(DoubleAccumulatorTest.class);
     }
 
     /**
-     * default constructed initializes to zero
+     * new instance initialized to supplied identity
      */
     public void testConstructor() {
-        DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
-        assertEquals(0.0, ai.get());
+        for (double identity : new double[] {
+                 Double.NEGATIVE_INFINITY,
+                 Double.POSITIVE_INFINITY,
+                 Double.MIN_VALUE,
+                 Double.MAX_VALUE,
+                 0.0,
+             })
+            assertEquals(identity,
+                         new DoubleAccumulator(Double::max, identity).get());
     }
 
     /**
@@ -38,7 +49,7 @@ public class DoubleAccumulatorTest exten
     }
 
     /**
-     * reset zeroes get
+     * reset() causes subsequent get() to return zero
      */
     public void testReset() {
         DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);
@@ -49,7 +60,7 @@ public class DoubleAccumulatorTest exten
     }
 
     /**
-     * getThenReset returns get then zeros
+     * getThenReset() returns current value; subsequent get() returns zero
      */
     public void testGetThenReset() {
         DoubleAccumulator ai = new DoubleAccumulator(Double::max, 0.0);