package org.apache.lucene.search.spell;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
import org.apache.lucene.util.LuceneTestCase;
public class TestLevenshteinDistance extends LuceneTestCase {
private StringDistance sd = new LevensteinDistance();
public void testGetDistance() {
float d = sd.getDistance("al", "al");
assertEquals(d,1.0f,0.001);
d = sd.getDistance("martha", "marhta");
assertEquals(d,0.6666,0.001);
d = sd.getDistance("jones", "johnson");
assertEquals(d,0.4285,0.001);
d = sd.getDistance("abcvwxyz", "cabvwxyz");
assertEquals(d,0.75,0.001);
d = sd.getDistance("dwayne", "duane");
assertEquals(d,0.666,0.001);
d = sd.getDistance("dixon", "dicksonx");
assertEquals(d,0.5,0.001);
d = sd.getDistance("six", "ten");
assertEquals(d,0,0.001);
float d1 = sd.getDistance("zac ephron", "zac efron");
float d2 = sd.getDistance("zac ephron", "kai ephron");
assertEquals(d1,d2,0.001);
d1 = sd.getDistance("brittney spears", "britney spears");
d2 = sd.getDistance("brittney spears", "brittney startzman");
assertTrue(d1 > d2);
}
public void testEmpty() throws Exception {
float d = sd.getDistance("", "al");
assertEquals(d,0.0f,0.001);
}
}