123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112 |
- /*
- * Copyright (C) 2010, Google Inc. and others
- *
- * This program and the accompanying materials are made available under the
- * terms of the Eclipse Distribution License v. 1.0 which is available at
- * https://www.eclipse.org/org/documents/edl-v10.php.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
- package org.eclipse.jgit.diff;
-
- import static org.junit.Assert.assertEquals;
-
- import org.junit.Test;
-
-
- public class HistogramDiffTest extends AbstractDiffTestCase {
- @Override
- protected HistogramDiff algorithm() {
- HistogramDiff hd = new HistogramDiff();
- hd.setFallbackAlgorithm(null);
- return hd;
- }
-
- @Test
- public void testEdit_NoUniqueMiddleSide_FlipBlocks() {
- EditList r = diff(t("aRRSSz"), t("aSSRRz"));
- assertEquals(2, r.size());
- assertEquals(new Edit(1, 3, 1, 1), r.get(0)); // DELETE "RR"
- assertEquals(new Edit(5, 5, 3, 5), r.get(1)); // INSERT "RR
- }
-
- @Test
- public void testEdit_NoUniqueMiddleSide_Insert2() {
- EditList r = diff(t("aRSz"), t("aRRSSz"));
- assertEquals(1, r.size());
- assertEquals(new Edit(2, 2, 2, 4), r.get(0));
- }
-
- @Test
- public void testEdit_NoUniqueMiddleSide_FlipAndExpand() {
- EditList r = diff(t("aRSz"), t("aSSRRz"));
- assertEquals(2, r.size());
- assertEquals(new Edit(1, 2, 1, 1), r.get(0)); // DELETE "R"
- assertEquals(new Edit(3, 3, 2, 5), r.get(1)); // INSERT "SRR"
- }
-
- @Test
- public void testEdit_LcsContainsUnique() {
- EditList r = diff(t("nqnjrnjsnm"), t("AnqnjrnjsnjTnmZ"));
- assertEquals(new Edit(0, 0, 0, 1), r.get(0)); // INSERT "A";
- assertEquals(new Edit(9, 9, 10, 13), r.get(1)); // INSERT "jTn";
- assertEquals(new Edit(10, 10, 14, 15), r.get(2)); // INSERT "Z";
- assertEquals(3, r.size());
- }
-
- @Test
- public void testExceedsChainLength_DuringScanOfA() {
- HistogramDiff hd = new HistogramDiff();
- hd.setFallbackAlgorithm(null);
- hd.setMaxChainLength(3);
-
- SequenceComparator<RawText> cmp = new SequenceComparator<RawText>() {
- @Override
- public boolean equals(RawText a, int ai, RawText b, int bi) {
- return RawTextComparator.DEFAULT.equals(a, ai, b, bi);
- }
-
- @Override
- public int hash(RawText a, int ai) {
- return 1;
- }
- };
-
- EditList r = hd.diff(cmp, t("RabS"), t("QabT"));
- assertEquals(1, r.size());
- assertEquals(new Edit(0, 4, 0, 4), r.get(0));
- }
-
- @Test
- public void testExceedsChainLength_DuringScanOfB() {
- HistogramDiff hd = new HistogramDiff();
- hd.setFallbackAlgorithm(null);
- hd.setMaxChainLength(1);
-
- EditList r = hd.diff(RawTextComparator.DEFAULT, t("RaaS"), t("QaaT"));
- assertEquals(1, r.size());
- assertEquals(new Edit(0, 4, 0, 4), r.get(0));
- }
-
- @Test
- public void testFallbackToMyersDiff() {
- HistogramDiff hd = new HistogramDiff();
- hd.setMaxChainLength(4);
-
- RawTextComparator cmp = RawTextComparator.DEFAULT;
- RawText ac = t("bbbbb");
- RawText bc = t("AbCbDbEFbZ");
- EditList r;
-
- // Without fallback our results are limited due to collisions.
- hd.setFallbackAlgorithm(null);
- r = hd.diff(cmp, ac, bc);
- assertEquals(1, r.size());
-
- // Results go up when we add a fallback for the high collision regions.
- hd.setFallbackAlgorithm(MyersDiff.INSTANCE);
- r = hd.diff(cmp, ac, bc);
- assertEquals(5, r.size());
- }
- }
|