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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.android.inputmethod.latin.utils;
import android.test.AndroidTestCase;
import android.test.suitebuilder.annotation.SmallTest;
@SmallTest
public class EditDistanceTests extends AndroidTestCase {
/*
* dist(kitten, sitting) == 3
*
* kitten-
* .|||.|
* sitting
*/
public void testExample1() {
final int dist = BinaryDictionaryUtils.editDistance("kitten", "sitting");
assertEquals("edit distance between 'kitten' and 'sitting' is 3",
3, dist);
}
/*
* dist(Sunday, Saturday) == 3
*
* Saturday
* | |.|||
* S--unday
*/
public void testExample2() {
final int dist = BinaryDictionaryUtils.editDistance("Saturday", "Sunday");
assertEquals("edit distance between 'Saturday' and 'Sunday' is 3",
3, dist);
}
public void testBothEmpty() {
final int dist = BinaryDictionaryUtils.editDistance("", "");
assertEquals("when both string are empty, no edits are needed",
0, dist);
}
public void testFirstArgIsEmpty() {
final int dist = BinaryDictionaryUtils.editDistance("", "aaaa");
assertEquals("when only one string of the arguments is empty,"
+ " the edit distance is the length of the other.",
4, dist);
}
public void testSecoondArgIsEmpty() {
final int dist = BinaryDictionaryUtils.editDistance("aaaa", "");
assertEquals("when only one string of the arguments is empty,"
+ " the edit distance is the length of the other.",
4, dist);
}
public void testSameStrings() {
final String arg1 = "The quick brown fox jumps over the lazy dog.";
final String arg2 = "The quick brown fox jumps over the lazy dog.";
final int dist = BinaryDictionaryUtils.editDistance(arg1, arg2);
assertEquals("when same strings are passed, distance equals 0.",
0, dist);
}
public void testSameReference() {
final String arg = "The quick brown fox jumps over the lazy dog.";
final int dist = BinaryDictionaryUtils.editDistance(arg, arg);
assertEquals("when same string references are passed, the distance equals 0.",
0, dist);
}
public void testNullArg() {
try {
BinaryDictionaryUtils.editDistance(null, "aaa");
fail("IllegalArgumentException should be thrown.");
} catch (Exception e) {
assertTrue(e instanceof IllegalArgumentException);
}
try {
BinaryDictionaryUtils.editDistance("aaa", null);
fail("IllegalArgumentException should be thrown.");
} catch (Exception e) {
assertTrue(e instanceof IllegalArgumentException);
}
}
}
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