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Add a test class for Myers' diff algorithm

Bug: 291083
Eclipse-CQ: 3559
Change-Id: I5a10946637438052e7596489b9f9de3a0c6b2066
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
stable-0.7
Johannes Schindelin 15 years ago committed by Shawn O. Pearce
parent
commit
1a03c864a6
  1. 109
      org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/MyersDiffTest.java

109
org.eclipse.jgit.test/tst/org/eclipse/jgit/diff/MyersDiffTest.java

@ -0,0 +1,109 @@
/*
* Copyright (C) 2009, Johannes E. Schindelin
* Copyright (C) 2009, Johannes Schindelin <johannes.schindelin@gmx.de>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.diff;
import junit.framework.TestCase;
public class MyersDiffTest extends TestCase {
public void testAtEnd() {
assertDiff("HELLO", "HELL", " -4,1 +4,0");
}
public void testAtStart() {
assertDiff("Git", "JGit", " -0,0 +0,1");
}
public void testSimple() {
assertDiff("HELLO WORLD", "LOW",
" -0,3 +0,0 -5,1 +2,0 -7,4 +3,0");
// is ambiguous, could be this, too:
// " -0,2 +0,0 -3,1 +1,0 -5,1 +2,0 -7,4 +3,0"
}
public void assertDiff(String a, String b, String edits) {
MyersDiff diff = new MyersDiff(toCharArray(a), toCharArray(b));
assertEquals(edits, toString(diff.getEdits()));
}
private static String toString(EditList list) {
StringBuilder builder = new StringBuilder();
for (Edit e : list)
builder.append(" -" + e.beginA
+ "," + (e.endA - e.beginA)
+ " +" + e.beginB + "," + (e.endB - e.beginB));
return builder.toString();
}
private static CharArray toCharArray(String s) {
return new CharArray(s);
}
protected static String toString(Sequence seq, int begin, int end) {
CharArray a = (CharArray)seq;
return new String(a.array, begin, end - begin);
}
protected static String toString(CharArray a, CharArray b,
int x, int k) {
return "(" + x + "," + (k + x)
+ (x < 0 ? '<' :
(x >= a.array.length ?
'>' : a.array[x]))
+ (k + x < 0 ? '<' :
(k + x >= b.array.length ?
'>' : b.array[k + x]))
+ ")";
}
private static class CharArray implements Sequence {
char[] array;
public CharArray(String s) { array = s.toCharArray(); }
public int size() { return array.length; }
public boolean equals(int i, Sequence other, int j) {
CharArray o = (CharArray)other;
return array[i] == o.array[j];
}
}
}
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