/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.util.editdistance;
import com.google.gwt.dev.util.editdistance.GeneralEditDistance;
import com.google.gwt.dev.util.editdistance.MyersBitParallelEditDistance;
import junit.framework.TestCase;
/**
* Test cases for the MyersBitParallelEditDistance class.
*
* Note that the GeneralEditDistance class tests provide
* good general coverage of this class as well.
*
* The tests here look for boundary conditions in the
* specific algorithm: near 32- and 64-bit edges.
*/
public class MyersBitParallelEditDistanceTest extends TestCase {
/** Generates an instance (just a notational shorthand) */
static MyersBitParallelEditDistance generate(String pattern) {
return MyersBitParallelEditDistance.getInstance(pattern);
}
public void test32end() {
String s1 = "abcdefghijklmnopqrstuvwxyz012345";
String s2 = "abcdefghijklmnopqrstuvwxyz01234";
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2,
1);
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2+"x",
1);
}
public void test32start() {
String s1 = "abcdefghijklmnopqrstuvwxyz012345";
String s2 = "Abcdefghijklmnopqrstuvwxyz012345";
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2,
1);
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2.substring(1),
1);
}
public void test32various() {
String s1 = "abcdefghijklmnopqrstuvwxyz012345";
String s2 = "abcdeghijklmNopqrstu@vwxyz1234";
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2,
5 /*fN@05*/);
}
/*
* Some tests with strings exactly 32 characters long -- just enough
* for an "int" bitmap.
*/
public void test33end() {
String s1 = "abcdefghijklmnopqrstuvwxyz0123456";
String s2 = "abcdefghijklmnopqrstuvwxyz012345";
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2,
1);
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2+"x",
1);
}
public void test33start() {
String s1 = "abcdefghijklmnopqrstuvwxyz0123456";
String s2 = "Abcdefghijklmnopqrstuvwxyz0123456";
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2,
1);
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2.substring(1),
1);
}
public void test64end() {
String s1 = "abcdefghijklmnopqrstuvwxyz0123456";
String s2 = "abcdefghijklmnopqrstuvwxyz012345";
GeneralEditDistanceTest.genericVerification(generate(s1+s1),
s1+s1, s1+s2,
1);
GeneralEditDistanceTest.genericVerification(generate(s1+s1),
s1+s1, s1+s2+"x",
1);
}
public void test64middle() {
String s1 = "abcdefghijklmnopqrstuvwxyz0123456";
String s2 = "abcdefghijklmnopqrstuvwxyz012345";
GeneralEditDistanceTest.genericVerification(generate(s1+s1),
s1+s1, s1+"x"+s2,
2);
GeneralEditDistanceTest.genericVerification(generate(s1+s1),
s1+s1, s2+"x"+s1,
1);
}
public void test64start() {
String s1 = "abcdefghijklmnopqrstuvwxyz0123456";
String s2 = "Abcdefghijklmnopqrstuvwxyz0123456";
GeneralEditDistanceTest.genericVerification(generate(s1+s1),
s1+s1, s2+s1,
1);
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2.substring(1),
1);
}
public void testbig() {
String s1base = "abcdefghijklmnopqrstuvwxyz0123456";
String s1 = s1base + s1base + s1base + s1base + s1base;
String s2 = s1base
+ "abcdeghijklmNopqrstu@vwxyz12346"
+ s1base
+ "bcdefGhijklmno$pqrstuvwxyz012345"
+ s1base;
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2,
5+4 /*fN@05, aG$6*/);
}
/** Verifies the choice of bit array sizing */
public void testBitArraySizing() {
String thirtyTwo = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
assertEquals(generate("").getClass(),
MyersBitParallelEditDistance.Empty.class);
assertEquals(generate(thirtyTwo).getClass(),
MyersBitParallelEditDistance.TYPEint.class);
assertEquals(generate(thirtyTwo+"x").getClass(),
MyersBitParallelEditDistance.TYPElong.class);
assertEquals(generate(thirtyTwo+thirtyTwo).getClass(),
MyersBitParallelEditDistance.TYPElong.class);
assertEquals(generate(thirtyTwo+thirtyTwo+"x").getClass(),
MyersBitParallelEditDistance.Multi.class);
}
/** Tests an "impossible" exception path */
public void testInternalCloneNotSupportedException() {
try {
new MyersBitParallelEditDistance.Multi("not really impossible") {
@Override
public Object clone() throws CloneNotSupportedException {
throw new CloneNotSupportedException("do the impossible");
}
}.duplicate();
assertTrue("Failed to throw exception", false);
} catch (IllegalStateException x) {
/* EXPECTED RESULT */
}
}
/** Test main programs to make sure they do not die unnaturally */
public void testMainProgramsForSanity() {
MyersBitParallelEditDistance.main(new String[] { "yes", "no", "5" });
MyersBitParallelEditDistance.Multi.main(new String[] { "yes", "no", "5" });
}
/** Test on a variety of word pairs, reusing an instance appropriately */
public void testOnWordSet() {
String [] words = GeneralEditDistanceTest.words;
int [][] expect = GeneralEditDistanceTest.wordsDistances;
for (int i = 0; i < words.length; i++) {
GeneralEditDistance engine = generate(words[i]);
for (int j = 0; j <= i; j++) {
GeneralEditDistanceTest.genericVerification(engine,
words[i], words[j],
expect[i][j]);
}
}
}
/** Tests a short pattern and target */
public void testShort() {
String s1 = "short";
String s2 = "snorts";
GeneralEditDistanceTest.genericVerification(generate(s1),
s1, s2, 2);
}
/** Tests zero-length patterns and targets; distance is other length */
public void testZeroLength() {
assertEquals(0, generate("").getDistance("", 1));
String other = "other";
GeneralEditDistanceTest.genericVerification(generate(""),
"", other,
other.length());
GeneralEditDistanceTest.genericVerification(generate(other),
other, "",
other.length());
}
}