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   *  to you under the Apache License, Version 2.0 (the
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  package org.apache.cayenne.graph;
  
  import static org.junit.Assert.assertSame;
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  public class NodeDiffTest {
  
  	@Test
  	public void testGetNodeId() {
  		Object id = new Object();
  		NodeDiff diff = new ConcreteNodeDiff(id);
  		assertSame(id, diff.getNodeId());
  	}
  
  	@Test
  	public void testCompareTo() {
  		NodeDiff d1 = new ConcreteNodeDiff("x", 1);
  		NodeDiff d2 = new ConcreteNodeDiff("y", 2);
  		NodeDiff d3 = new ConcreteNodeDiff("z", 3);
  		NodeDiff d4 = new ConcreteNodeDiff("a", 2);
  
  		assertTrue(d1.compareTo(d2) < 0);
  		assertTrue(d2.compareTo(d1) > 0);
  		assertTrue(d1.compareTo(d3) < 0);
  		assertTrue(d2.compareTo(d4) == 0);
  		assertTrue(d2.compareTo(d3) < 0);
  	}
  
  	@SuppressWarnings("serial")
  	class ConcreteNodeDiff extends NodeDiff {
  
  		public ConcreteNodeDiff(Object nodeId) {
  			super(nodeId);
  		}
  
  		public ConcreteNodeDiff(Object nodeId, int diffId) {
  			super(nodeId, diffId);
  		}
  
  		@Override
  		public void apply(GraphChangeHandler tracker) {
  		}
  
  		@Override
  		public void undo(GraphChangeHandler tracker) {
  		}
  	}
  }
  