--- jsr166/src/test/tck/JSR166TestCase.java	2019/01/10 04:35:16	1.252
+++ jsr166/src/test/tck/JSR166TestCase.java	2019/08/11 22:29:26	1.256
@@ -288,8 +288,9 @@ public class JSR166TestCase extends Test
             // Avoid spurious reports with enormous runsPerTest.
             // A single test case run should never take more than 1 second.
             // But let's cap it at the high end too ...
-            final int timeoutMinutes =
-                Math.min(15, Math.max(runsPerTest / 60, 1));
+            final int timeoutMinutesMin = Math.max(runsPerTest / 60, 1)
+                * Math.max((int) delayFactor, 1);
+            final int timeoutMinutes = Math.min(15, timeoutMinutesMin);
             for (TestCase lastTestCase = currentTestCase;;) {
                 try { MINUTES.sleep(timeoutMinutes); }
                 catch (InterruptedException unexpected) { break; }
@@ -517,6 +518,7 @@ public class JSR166TestCase extends Test
             ExecutorsTest.suite(),
             ExecutorCompletionServiceTest.suite(),
             FutureTaskTest.suite(),
+            HashtableTest.suite(),
             LinkedBlockingDequeTest.suite(),
             LinkedBlockingQueueTest.suite(),
             LinkedListTest.suite(),
@@ -683,6 +685,13 @@ public class JSR166TestCase extends Test
     static TimeUnit randomTimeUnit() { return RANDOM_TIMEUNIT; }
 
     /**
+     * Returns a random boolean; a "coin flip".
+     */
+    static boolean randomBoolean() {
+        return ThreadLocalRandom.current().nextBoolean();
+    }
+
+    /**
      * Returns the shortest timed delay. This can be scaled up for
      * slow machines using the jsr166.delay.factor system property,
      * or via jtreg's -timeoutFactor: flag.
@@ -1750,12 +1759,11 @@ public class JSR166TestCase extends Test
         }
     }
 
-    void assertImmutable(final Object o) {
+    void assertImmutable(Object o) {
         if (o instanceof Collection) {
             assertThrows(
                 UnsupportedOperationException.class,
-                new Runnable() { public void run() {
-                        ((Collection) o).add(null);}});
+                () -> ((Collection) o).add(null));
         }
     }
 
@@ -1815,8 +1823,8 @@ public class JSR166TestCase extends Test
     }
 
     public void assertThrows(Class<? extends Throwable> expectedExceptionClass,
-                             Runnable... throwingActions) {
-        for (Runnable throwingAction : throwingActions) {
+                             Action... throwingActions) {
+        for (Action throwingAction : throwingActions) {
             boolean threw = false;
             try { throwingAction.run(); }
             catch (Throwable t) {