1 files changed, 74 insertions, 0 deletions
diff --git a/guava-tests/test/com/google/common/testing/FakeTickerTest.java b/guava-tests/test/com/google/common/testing/FakeTickerTest.java
new file mode 100644
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--- /dev/null
+++ b/guava-tests/test/com/google/common/testing/FakeTickerTest.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2008 The Guava Authors
+ *
+ * Licensed 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 com.google.common.testing;
+
+import com.google.common.annotations.GwtCompatible;
+import com.google.common.annotations.GwtIncompatible;
+
+import junit.framework.TestCase;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Unit test for {@link FakeTicker}.
+ *
+ * @author benyu@google.com (Jige Yu)
+ */
+@GwtCompatible(emulated = true)
+public class FakeTickerTest extends TestCase {
+
+  public void testAdvance() {
+    FakeTicker ticker = new FakeTicker();
+    assertEquals(0, ticker.read());
+    assertSame(ticker, ticker.advance(10));
+    assertEquals(10, ticker.read());
+    ticker.advance(1, TimeUnit.MILLISECONDS);
+    assertEquals(1000010L, ticker.read());
+  }
+
+  @GwtIncompatible("concurrency")
+
+  public void testConcurrentAdvance() throws Exception {
+    final FakeTicker ticker = new FakeTicker();
+
+    int numberOfThreads = 64;
+    ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads);
+    final CountDownLatch startLatch = new CountDownLatch(numberOfThreads);
+    final CountDownLatch doneLatch = new CountDownLatch(numberOfThreads);
+    for (int i = numberOfThreads; i > 0; i--) {
+      executorService.submit(new Callable<Void>() {
+        @Override
+        public Void call() throws Exception {
+          // adds two nanoseconds to the ticker
+          startLatch.countDown();
+          startLatch.await();
+          ticker.advance(1L);
+          Thread.sleep(10);
+          ticker.advance(1L);
+          doneLatch.countDown();
+          return null;
+        }
+      });
+    }
+    doneLatch.await();
+    assertEquals(numberOfThreads * 2, ticker.read());
+  }
+}