java-diff-utils/test/testcase/diffutills/DiffTest.java

package testcase.diffutills;

import java.util.*;

import junit.framework.TestCase;
import difflib.*;

public class DiffTest extends TestCase {
	private List<String> changeTest_from = Arrays.asList("aaa", "bbb", "ccc");
	private List<String> changeTest_to   = Arrays.asList("aaa", "zzz", "ccc");
	
	private List<String> deleteTest_from = Arrays.asList("ddd", "fff", "ggg");
	private List<String> deleteTest_to   = Arrays.asList("ggg");
	
	private List<String> insertTest_from = Arrays.asList("hhh");
	private List<String> insertTest_to   = Arrays.asList("hhh", "jjj", "kkk");
	
	@SuppressWarnings("serial")
	public void testDiff_Insert() {
		Patch patch = DiffUtils.diff(insertTest_from, insertTest_to);
		assertNotNull(patch);
		assertEquals(patch.getDeltas().size(), 1);
		Delta delta = patch.getDeltas().get(0);
		assertEquals(InsertDelta.class, delta.getClass());
		assertEquals(new Chunk(1, 0, new LinkedList<String>()), 
				delta.getOriginal());
		assertEquals(new Chunk(1, 2, new LinkedList<String>() {{ add("jjj"); add("kkk"); }}), 
				delta.getRevised());
	}
	
	@SuppressWarnings("serial")
	public void testDiff_Delete() {
		Patch patch = DiffUtils.diff(deleteTest_from, deleteTest_to);
		assertNotNull(patch);
		assertEquals(patch.getDeltas().size(), 1);
		Delta delta = patch.getDeltas().get(0);
		assertEquals(DeleteDelta.class, delta.getClass());
		assertEquals(new Chunk(0, 2, new LinkedList<String>() {{ add("ddd"); add("fff"); }}), 
				delta.getOriginal());
		assertEquals(new Chunk(0, 0, new LinkedList<String>()), 
				delta.getRevised());
	}
	
	@SuppressWarnings("serial")
	public void testDiff_Change() {
		Patch patch = DiffUtils.diff(changeTest_from, changeTest_to);
		assertNotNull(patch);
		assertEquals(patch.getDeltas().size(), 1);
		Delta delta = patch.getDeltas().get(0);
		assertEquals(ChangeDelta.class, delta.getClass());
		assertEquals(new Chunk(1, 1, new LinkedList<String>() {{ add("bbb"); }}), 
				delta.getOriginal());
		assertEquals(new Chunk(1, 1, new LinkedList<String>() {{ add("zzz"); }}), 
				delta.getRevised());
	}
}