DiffTest.java

/*
 * SPDX-License-Identifier: Apache-1.1
 *
 * ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999-2003 The Apache Software Foundation.
 * Copyright (c) 2010 Dmitry Naumenko (dm.naumenko@gmail.com)
 * Copyright (c) 2015-2016 Brenden Kromhout and contributors to java-diff-utils
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    any, must include the following acknowledgement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
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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());
    }
}