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  package org.apache.cayenne.cache.invalidation;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.function.Function;
  
  import org.apache.cayenne.Persistent;
  import org.apache.cayenne.cache.invalidation.db.E1;
  import org.apache.cayenne.cache.invalidation.db.E2;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  /**
   * @since 4.0
   */
  public class CacheGroupsHandlerTest {
  
      @Test
      public void canHandleE1() throws Exception {
          CacheGroupsHandler handler = new  CacheGroupsHandler();
          Function<Persistent, Collection<CacheGroupDescriptor>> function = handler.canHandle(E1.class);
          Collection<CacheGroupDescriptor> result = function.apply(null);
  
          assertEquals(2, result.size());
  
          String[] names = {"g1", "g2"};
          Collection<String> extractedNames = new ArrayList<>();
          for(CacheGroupDescriptor descriptor : result) {
              extractedNames.add(descriptor.getCacheGroupName());
          }
          assertArrayEquals(names, extractedNames.toArray());
      }
  
      @Test
      public void canHandleE2() throws Exception {
          CacheGroupsHandler handler = new  CacheGroupsHandler();
          Function<Persistent, Collection<CacheGroupDescriptor>> function = handler.canHandle(E2.class);
          Collection<CacheGroupDescriptor> result = function.apply(null);
  
          assertEquals(6, result.size());
  
          String[] names = {"g1", "g2", "g3", "g4", "g5", "g6"};
          Collection<String> extractedNames = new ArrayList<>();
          for(CacheGroupDescriptor descriptor : result) {
              extractedNames.add(descriptor.getCacheGroupName());
          }
          assertArrayEquals(names, extractedNames.toArray());
      }
  
  }