Add the missing file TestCommandFactory for HADOOP-7224.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1091970 13f79535-47bb-0310-9956-ffa450edef68

src/test/core/org/apache/hadoop/fs/shell/TestCommandFactory.java

@@ -0,0 +1,87 @@
+/**
+ * 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.fs.shell;
+
+import static org.junit.Assert.*;
+
+import org.apache.hadoop.conf.Configuration;
+import org.junit.Before;
+import org.junit.Test;
+
+public class TestCommandFactory {
+  static CommandFactory factory;
+  static Configuration conf = new Configuration();
+  
+  static void registerCommands(CommandFactory factory) {
+  }
+  
+  @Before
+  public void testSetup() {
+    factory = new CommandFactory(conf);
+    assertNotNull(factory);
+  }
+  
+  @Test
+  public void testRegistration() {
+    assertArrayEquals(new String []{}, factory.getNames());
+
+    factory.registerCommands(TestRegistrar.class);
+    String [] names = factory.getNames();
+    assertArrayEquals(new String []{"tc1", "tc2", "tc2.1"}, names);
+    
+    factory.addClass(TestCommand3.class, "tc3");
+    names = factory.getNames();
+    assertArrayEquals(new String []{"tc1", "tc2", "tc2.1", "tc3"}, names);
+  }
+  
+  @Test
+  public void testGetInstances() {
+    factory.registerCommands(TestRegistrar.class);
+
+    Command instance;
+    instance = factory.getInstance("blarg");
+    assertNull(instance);
+    
+    instance = factory.getInstance("tc1");
+    assertNotNull(instance);
+    assertEquals(TestCommand1.class, instance.getClass());
+    assertEquals("tc1", instance.getCommandName());
+    
+    instance = factory.getInstance("tc2");
+    assertNotNull(instance);
+    assertEquals(TestCommand2.class, instance.getClass());
+    assertEquals("tc2", instance.getCommandName());
+
+    instance = factory.getInstance("tc2.1");
+    assertNotNull(instance);
+    assertEquals(TestCommand2.class, instance.getClass());    
+    assertEquals("tc2.1", instance.getCommandName());
+  }
+  
+  static class TestRegistrar {
+    public static void registerCommands(CommandFactory factory) {
+      factory.addClass(TestCommand1.class, "tc1");
+      factory.addClass(TestCommand2.class, "tc2", "tc2.1");
+    }
+  }
+  
+  static class TestCommand1 extends FsCommand {}
+  static class TestCommand2 extends FsCommand {}
+  static class TestCommand3 extends FsCommand {}
+}