Add missing file TestCgroupsLCEResourcesHandler for YARN-1284.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1530495 13f79535-47bb-0310-9956-ffa450edef68

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/test/java/org/apache/hadoop/yarn/server/nodemanager/util/TestCgroupsLCEResourcesHandler.java

@@ -0,0 +1,73 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF 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.apache.hadoop.yarn.server.nodemanager.util;
+
+import junit.framework.Assert;
+import org.apache.hadoop.yarn.conf.YarnConfiguration;
+import org.apache.hadoop.yarn.util.Clock;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+
+public class TestCgroupsLCEResourcesHandler {
+
+  static class MockClock implements Clock {
+    long time;
+    @Override
+    public long getTime() {
+      return time;
+    }
+  }
+  @Test
+  public void testDeleteCgroup() throws Exception {
+    final MockClock clock = new MockClock();
+    clock.time = System.currentTimeMillis();
+    CgroupsLCEResourcesHandler handler = new CgroupsLCEResourcesHandler();
+    handler.setConf(new YarnConfiguration());
+    handler.initConfig();
+    handler.clock = clock;
+    
+    //file exists
+    File file = new File("target", UUID.randomUUID().toString());
+    new FileOutputStream(file).close();
+    Assert.assertTrue(handler.deleteCgroup(file.getPath()));
+
+    //file does not exists, timing out
+    final CountDownLatch latch = new CountDownLatch(1);
+    new Thread() {
+      @Override
+      public void run() {
+        latch.countDown();
+        try {
+          Thread.sleep(200);
+        } catch (InterruptedException ex) {
+          //NOP
+        }
+        clock.time += YarnConfiguration.
+            DEFAULT_NM_LINUX_CONTAINER_CGROUPS_DELETE_TIMEOUT;
+      }
+    }.start();
+    latch.await();
+    file = new File("target", UUID.randomUUID().toString());
+    Assert.assertFalse(handler.deleteCgroup(file.getPath()));
+  }
+
+}