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   * 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
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  package org.apache.ambari.server.api.query.render;
  
  import static org.easymock.EasyMock.createNiceMock;
  import static org.easymock.EasyMock.expect;
  import static org.easymock.EasyMock.replay;
  import static org.easymock.EasyMock.verify;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import org.apache.ambari.server.api.query.QueryInfo;
  import org.apache.ambari.server.api.resources.ServiceResourceDefinition;
  import org.apache.ambari.server.api.util.TreeNode;
  import org.apache.ambari.server.api.util.TreeNodeImpl;
  import org.apache.ambari.server.controller.spi.Resource;
  import org.apache.ambari.server.controller.spi.Schema;
  import org.apache.ambari.server.controller.spi.SchemaFactory;
  import org.junit.Test;
  
  public class MetricsPaddingRendererTest {
    @Test
    public void testFinalizeProperties__NullPadding_property() {
      SchemaFactory schemaFactory = createNiceMock(SchemaFactory.class);
      Schema schema = createNiceMock(Schema.class);
  
      // schema expectations
      expect(schemaFactory.getSchema(Resource.Type.Service)).andReturn(schema).anyTimes();
      expect(schema.getKeyPropertyId(Resource.Type.Service)).andReturn("ServiceInfo/service_name").anyTimes();
      expect(schema.getKeyPropertyId(Resource.Type.Cluster)).andReturn("ServiceInfo/cluster_name").anyTimes();
  
      replay(schemaFactory, schema);
  
      HashSet<String> serviceProperties = new HashSet<>();
      serviceProperties.add("foo/bar");
      QueryInfo rootQuery = new QueryInfo(new ServiceResourceDefinition(), serviceProperties);
      TreeNode<QueryInfo> queryTree = new TreeNodeImpl<>(null, rootQuery, "Service");
  
      MetricsPaddingRenderer renderer = new MetricsPaddingRenderer("null_padding");
      renderer.init(schemaFactory);
      TreeNode<Set<String>> propertyTree = renderer.finalizeProperties(queryTree, false);
  
      assertEquals(4, propertyTree.getObject().size());
      assertTrue(propertyTree.getObject().contains("ServiceInfo/service_name"));
      assertTrue(propertyTree.getObject().contains("ServiceInfo/cluster_name"));
      assertTrue(propertyTree.getObject().contains("foo/bar"));
      assertTrue(propertyTree.getObject().contains("params/padding/NULLS"));
      assertEquals(0, propertyTree.getChildren().size());
  
  
      verify(schemaFactory, schema);
    }
  }
  