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  package org.eclipse.jgit.treewalk;
  
  import static org.eclipse.jgit.lib.Constants.OBJ_BLOB;
  import static org.eclipse.jgit.lib.Constants.encode;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import org.eclipse.jgit.junit.RepositoryTestCase;
  import org.eclipse.jgit.lib.FileMode;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.ObjectInserter;
  import org.eclipse.jgit.lib.TreeFormatter;
  import org.eclipse.jgit.treewalk.filter.TreeFilter;
  import org.junit.Test;
  
  public class TreeWalkBasicDiffTest extends RepositoryTestCase {
  	@Test
  	public void testMissingSubtree_DetectFileAdded_FileModified()
  			throws Exception {
  		final ObjectId oldTree, newTree, bFileId, cFileId1, cFileId2;
  		try (ObjectInserter inserter = db.newObjectInserter()) {
  			final ObjectId aFileId = inserter.insert(OBJ_BLOB, encode("a"));
  			bFileId = inserter.insert(OBJ_BLOB, encode("b"));
  			cFileId1 = inserter.insert(OBJ_BLOB, encode("c-1"));
  			cFileId2 = inserter.insert(OBJ_BLOB, encode("c-2"));
  
  			// Create sub-a/empty, sub-c/empty = hello.
  			{
  				TreeFormatter root = new TreeFormatter();
  				{
  					TreeFormatter subA = new TreeFormatter();
  					subA.append("empty", FileMode.REGULAR_FILE, aFileId);
  					root.append("sub-a", FileMode.TREE, inserter.insert(subA));
  				}
  				{
  					TreeFormatter subC = new TreeFormatter();
  					subC.append("empty", FileMode.REGULAR_FILE, cFileId1);
  					root.append("sub-c", FileMode.TREE, inserter.insert(subC));
  				}
  				oldTree = inserter.insert(root);
  			}
  
  			// Create sub-a/empty, sub-b/empty, sub-c/empty.
  			{
  				TreeFormatter root = new TreeFormatter();
  				{
  					TreeFormatter subA = new TreeFormatter();
  					subA.append("empty", FileMode.REGULAR_FILE, aFileId);
  					root.append("sub-a", FileMode.TREE, inserter.insert(subA));
  				}
  				{
  					TreeFormatter subB = new TreeFormatter();
  					subB.append("empty", FileMode.REGULAR_FILE, bFileId);
  					root.append("sub-b", FileMode.TREE, inserter.insert(subB));
  				}
 				{
 					TreeFormatter subC = new TreeFormatter();
 					subC.append("empty", FileMode.REGULAR_FILE, cFileId2);
 					root.append("sub-c", FileMode.TREE, inserter.insert(subC));
 				}
 				newTree = inserter.insert(root);
 			}
 			inserter.flush();
 		}
 
 		try (TreeWalk tw = new TreeWalk(db)) {
 			tw.reset(oldTree, newTree);
 			tw.setRecursive(true);
 			tw.setFilter(TreeFilter.ANY_DIFF);
 
 			assertTrue(tw.next());
 			assertEquals("sub-b/empty", tw.getPathString());
 			assertEquals(FileMode.MISSING, tw.getFileMode(0));
 			assertEquals(FileMode.REGULAR_FILE, tw.getFileMode(1));
 			assertEquals(ObjectId.zeroId(), tw.getObjectId(0));
 			assertEquals(bFileId, tw.getObjectId(1));
 
 			assertTrue(tw.next());
 			assertEquals("sub-c/empty", tw.getPathString());
 			assertEquals(FileMode.REGULAR_FILE, tw.getFileMode(0));
 			assertEquals(FileMode.REGULAR_FILE, tw.getFileMode(1));
 			assertEquals(cFileId1, tw.getObjectId(0));
 			assertEquals(cFileId2, tw.getObjectId(1));
 
 			assertFalse(tw.next());
 		}
 	}
 }