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11 package org.eclipse.jgit.diff;
12
13 import static org.junit.Assert.assertEquals;
14
15 import org.junit.Test;
16
17
18 public class HistogramDiffTest extends AbstractDiffTestCase {
19 @Override
20 protected HistogramDiff algorithm() {
21 HistogramDiff hd = new HistogramDiff();
22 hd.setFallbackAlgorithm(null);
23 return hd;
24 }
25
26 @Test
27 public void testEdit_NoUniqueMiddleSide_FlipBlocks() {
28 EditList r = diff(t("aRRSSz"), t("aSSRRz"));
29 assertEquals(2, r.size());
30 assertEquals(new Edit(1, 3, 1, 1), r.get(0));
31 assertEquals(new Edit(5, 5, 3, 5), r.get(1));
32 }
33
34 @Test
35 public void testEdit_NoUniqueMiddleSide_Insert2() {
36 EditList r = diff(t("aRSz"), t("aRRSSz"));
37 assertEquals(1, r.size());
38 assertEquals(new Edit(2, 2, 2, 4), r.get(0));
39 }
40
41 @Test
42 public void testEdit_NoUniqueMiddleSide_FlipAndExpand() {
43 EditList r = diff(t("aRSz"), t("aSSRRz"));
44 assertEquals(2, r.size());
45 assertEquals(new Edit(1, 2, 1, 1), r.get(0));
46 assertEquals(new Edit(3, 3, 2, 5), r.get(1));
47 }
48
49 @Test
50 public void testEdit_LcsContainsUnique() {
51 EditList r = diff(t("nqnjrnjsnm"), t("AnqnjrnjsnjTnmZ"));
52 assertEquals(new Edit(0, 0, 0, 1), r.get(0));
53 assertEquals(new Edit(9, 9, 10, 13), r.get(1));
54 assertEquals(new Edit(10, 10, 14, 15), r.get(2));
55 assertEquals(3, r.size());
56 }
57
58 @Test
59 public void testExceedsChainLength_DuringScanOfA() {
60 HistogramDiff hd = new HistogramDiff();
61 hd.setFallbackAlgorithm(null);
62 hd.setMaxChainLength(3);
63
64 SequenceComparator<RawText> cmp = new SequenceComparator<>() {
65
66 @Override
67 public boolean equals(RawText a, int ai, RawText b, int bi) {
68 return RawTextComparator.DEFAULT.equals(a, ai, b, bi);
69 }
70
71 @Override
72 public int hash(RawText a, int ai) {
73 return 1;
74 }
75 };
76
77 EditList r = hd.diff(cmp, t("RabS"), t("QabT"));
78 assertEquals(1, r.size());
79 assertEquals(new Edit(0, 4, 0, 4), r.get(0));
80 }
81
82 @Test
83 public void testExceedsChainLength_DuringScanOfB() {
84 HistogramDiff hd = new HistogramDiff();
85 hd.setFallbackAlgorithm(null);
86 hd.setMaxChainLength(1);
87
88 EditList r = hd.diff(RawTextComparator.DEFAULT, t("RaaS"), t("QaaT"));
89 assertEquals(1, r.size());
90 assertEquals(new Edit(0, 4, 0, 4), r.get(0));
91 }
92
93 @Test
94 public void testFallbackToMyersDiff() {
95 HistogramDiff hd = new HistogramDiff();
96 hd.setMaxChainLength(4);
97
98 RawTextComparator cmp = RawTextComparator.DEFAULT;
99 RawText ac = t("bbbbb");
100 RawText bc = t("AbCbDbEFbZ");
101 EditList r;
102
103
104 hd.setFallbackAlgorithm(null);
105 r = hd.diff(cmp, ac, bc);
106 assertEquals(1, r.size());
107
108
109 hd.setFallbackAlgorithm(MyersDiff.INSTANCE);
110 r = hd.diff(cmp, ac, bc);
111 assertEquals(5, r.size());
112 }
113 }