[#744] Add test which I missed to commit before

src/test/java/org/jboss/netty/util/HashedWheelTimerTest.java

@@ -0,0 +1,105 @@
+/*
+ * Copyright 2013 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package org.jboss.netty.util;
+
+import org.junit.Test;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+public class HashedWheelTimerTest {
+
+    @Test
+    public void testScheduleTimeoutShouldNotRunBeforeDelay() throws InterruptedException {
+        final Timer timer = new HashedWheelTimer();
+        final CountDownLatch barrier = new CountDownLatch(1);
+        final Timeout timeout = timer.newTimeout(new TimerTask() {
+            @Override
+            public void run(Timeout timeout) throws Exception {
+                fail("This should not have run");
+                barrier.countDown();
+            }
+        }, 10, TimeUnit.SECONDS);
+        assertFalse(barrier.await(3, TimeUnit.SECONDS));
+        assertFalse("timer should not expire", timeout.isExpired());
+        timer.stop();
+    }
+
+    @Test
+    public void testScheduleTimeoutShouldRunAfterDelay() throws InterruptedException {
+        final Timer timer = new HashedWheelTimer();
+        final CountDownLatch barrier = new CountDownLatch(1);
+        final Timeout timeout = timer.newTimeout(new TimerTask() {
+            @Override
+            public void run(Timeout timeout) throws Exception {
+                barrier.countDown();
+            }
+        }, 2, TimeUnit.SECONDS);
+        assertTrue(barrier.await(3, TimeUnit.SECONDS));
+        assertTrue("timer should expire", timeout.isExpired());
+        timer.stop();
+    }
+
+    @Test
+    public void testStopTimer() throws InterruptedException {
+        final Timer timerProcessed = new HashedWheelTimer();
+        for (int i = 0; i < 3; i ++) {
+            timerProcessed.newTimeout(new TimerTask() {
+                @Override
+                public void run(Timeout timeout) throws Exception {
+                }
+            }, 1, TimeUnit.MILLISECONDS);
+        }
+        Thread.sleep(1000L); // sleep for a second
+        assertEquals("Number of unprocessed timeouts should be 0", 0, timerProcessed.stop().size());
+
+        final Timer timerUnprocessed = new HashedWheelTimer();
+        for (int i = 0; i < 5; i ++) {
+            timerUnprocessed.newTimeout(new TimerTask() {
+                @Override
+                public void run(Timeout timeout) throws Exception {
+                }
+            }, 5, TimeUnit.SECONDS);
+        }
+        Thread.sleep(1000L); // sleep for a second
+        assertFalse("Number of unprocessed timeouts should be greater than 0", timerUnprocessed.stop().isEmpty());
+    }
+
+    @Test(expected = IllegalStateException.class)
+    public void testTimerShouldThrowExceptionAfterShutdownForNewTimeouts() throws InterruptedException {
+        final Timer timer = new HashedWheelTimer();
+        for (int i = 0; i < 3; i ++) {
+            timer.newTimeout(new TimerTask() {
+                @Override
+                public void run(Timeout timeout) throws Exception {
+                }
+            }, 1, TimeUnit.MILLISECONDS);
+        }
+
+        timer.stop();
+        Thread.sleep(1000L); // sleep for a second
+
+        timer.newTimeout(new TimerTask() {
+            @Override
+            public void run(Timeout timeout) throws Exception {
+                fail("This should not run");
+            }
+        }, 1, TimeUnit.SECONDS);
+    }
+}