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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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * Unless required by applicable law or agreed to in writing, software
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   * See the License for the specific language governing permissions and
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  package org.apache.atlas.repository.impexp;
  
  import org.apache.atlas.RequestContext;
  import org.apache.atlas.TestModules;
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.repository.AtlasTestBase;
  import org.apache.atlas.repository.graphdb.AtlasGraph;
  import org.apache.atlas.repository.store.graph.v2.AtlasEntityStoreV2;
  import org.apache.atlas.repository.util.UniqueList;
  import org.apache.atlas.store.AtlasTypeDefStore;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.testng.annotations.AfterClass;
  import org.testng.annotations.BeforeClass;
  import org.testng.annotations.Guice;
  import org.testng.annotations.Test;
  
  import javax.inject.Inject;
  import javax.script.ScriptEngine;
  
  import java.io.IOException;
  
  import static org.testng.Assert.assertEquals;
  import static org.testng.Assert.assertTrue;
  
  @Guice(modules = TestModules.TestOnlyModule.class)
  public class IncrementalExportEntityProviderTest extends AtlasTestBase {
      @Inject
      AtlasTypeRegistry typeRegistry;
  
      @Inject
      private AtlasTypeDefStore typeDefStore;
  
      @Inject
      private AtlasEntityStoreV2 entityStore;
  
      @Inject
      private AtlasGraph atlasGraph;
  
      private IncrementalExportEntityProvider incrementalExportEntityProvider;
      private ScriptEngine                    gremlinScriptEngine;
  
      @BeforeClass
      public void setup() throws IOException, AtlasBaseException {
          basicSetup(typeDefStore, typeRegistry);
          RequestContext.get().setImportInProgress(true);
          createEntities(entityStore, ENTITIES_SUB_DIR, new String[] {"db", "table-columns"});
          final String[] entityGuids = {DB_GUID, TABLE_GUID};
          verifyCreatedEntities(entityStore, entityGuids, 2);
  
          gremlinScriptEngine             = atlasGraph.getGremlinScriptEngine();
          incrementalExportEntityProvider = new IncrementalExportEntityProvider(atlasGraph);
      }
  
      @AfterClass
      public void tearDown() {
          if (gremlinScriptEngine != null) {
              atlasGraph.releaseGremlinScriptEngine(gremlinScriptEngine);
          }
      }
  
      @Test
      public void verify() {
          executeQueries(0L, 1);
          executeQueries(1L, 9);
      }
  
      private void executeQueries(long timeStamp, int expectedEntityCount) {
          UniqueList<String> uniqueList = new UniqueList<>();
          incrementalExportEntityProvider.populate(DB_GUID, timeStamp, uniqueList);
  
          for (String g : uniqueList.getList()) {
              assertTrue(g instanceof String);
          }
  
          assertEquals(uniqueList.size(), expectedEntityCount);
      }
  }
  