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  package org.apache.cayenne;
  
  import org.junit.Test;
  
  import java.util.HashSet;
  import java.util.Set;
  
  import static org.junit.Assert.assertTrue;
  
  public class ObjectIdRegressionTest {
  
      @Test
      public void testIdPool() throws Exception {
          // testing uniqueness of a sequence of ObjectIds generated quickly one after the other...
  
          int size = 100000;
  
          ObjectId.of("Artist");
          ObjectId[] pool = new ObjectId[size];
  
          long t0 = System.currentTimeMillis();
          // fill in
          for (int i = 0; i < size; i++) {
              pool[i] = ObjectId.of("Artist");
          }
  
          long t1 = System.currentTimeMillis();
  
          assertTrue("This machine is too fast to run such test!", t1 - t0 > 1);
  
          Set<ObjectId> idSet = new HashSet<>();
          for (int i = 0; i < size; i++) {
              assertTrue("Failed to generate unique id #" + i, idSet.add(pool[i]));
          }
      }
  }
  