package diffutils;

import difflib.*;

import junit.framework.TestCase;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.List;

public class DiffTest extends TestCase {

public void testDiff_Insert() {

final Patch<String> patch = DiffUtils.diff(Arrays.asList("hhh"), Arrays.asList("hhh", "jjj", "kkk"));

assertNotNull(patch);

assertEquals(1, patch.getDeltas().size());

final Delta<String> delta = patch.getDeltas().get(0);

assertEquals(InsertDelta.class, delta.getClass());

assertEquals(new Chunk<String>(1, Collections.<String> emptyList()), delta.getOriginal());

assertEquals(new Chunk<String>(1, Arrays.asList("jjj", "kkk")), delta.getRevised());

}

public void testDiff_Delete() {

final Patch<String> patch = DiffUtils.diff(Arrays.asList("ddd", "fff", "ggg"), Arrays.asList("ggg"));

assertNotNull(patch);

assertEquals(1, patch.getDeltas().size());

final Delta<String> delta = patch.getDeltas().get(0);

assertEquals(DeleteDelta.class, delta.getClass());

assertEquals(new Chunk<String>(0, Arrays.asList("ddd", "fff")), delta.getOriginal());

assertEquals(new Chunk<String>(0, Collections.<String> emptyList()), delta.getRevised());

}

public void testDiff_Change() {

final List<String> changeTest_from = Arrays.asList("aaa", "bbb", "ccc");

final List<String> changeTest_to = Arrays.asList("aaa", "zzz", "ccc");

final Patch<String> patch = DiffUtils.diff(changeTest_from, changeTest_to);

assertNotNull(patch);

assertEquals(1, patch.getDeltas().size());

final Delta<String> delta = patch.getDeltas().get(0);

assertEquals(ChangeDelta.class, delta.getClass());

assertEquals(new Chunk<String>(1, Arrays.asList("bbb")), delta.getOriginal());

assertEquals(new Chunk<String>(1, Arrays.asList("zzz")), delta.getRevised());

}

public void testDiff_EmptyList() {

final Patch<String> patch = DiffUtils.diff(new ArrayList<String>(), new ArrayList<String>());

assertNotNull(patch);

assertEquals(0, patch.getDeltas().size());

}

public void testDiff_EmptyListWithNonEmpty() {

final Patch<String> patch = DiffUtils.diff(new ArrayList<String>(), Arrays.asList("aaa"));

assertNotNull(patch);

assertEquals(1, patch.getDeltas().size());

final Delta<String> delta = patch.getDeltas().get(0);

assertEquals(InsertDelta.class, delta.getClass());

}

}