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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.providers.contacts.aggregation.util;
     18 
     19 import android.test.suitebuilder.annotation.SmallTest;
     20 
     21 import com.android.providers.contacts.NameNormalizer;
     22 import com.android.providers.contacts.util.Hex;
     23 
     24 import junit.framework.TestCase;
     25 
     26 /**
     27  * Unit tests for {@link NameDistance}.
     28  *
     29  * Run the test like this:
     30  * <code>
     31  * adb shell am instrument -e class com.android.providers.contacts.NameDistanceTest -w \
     32  *         com.android.providers.contacts.tests/android.test.InstrumentationTestRunner
     33  * </code>
     34  */
     35 @SmallTest
     36 public class NameDistanceTest extends TestCase {
     37 
     38     private NameDistance mNameDistance;
     39 
     40     @Override
     41     protected void setUp() throws Exception {
     42         super.setUp();
     43 
     44         mNameDistance = new NameDistance(30);
     45     }
     46 
     47     public void testExactMatch() {
     48         assertFloat(1, "Dwayne", "Dwayne");
     49     }
     50 
     51     public void testWinklerBonus() {
     52         assertFloat(0.961f, "Martha", "Marhta");
     53         assertFloat(0.840f, "Dwayne", "Duane");
     54         assertFloat(0.813f, "DIXON", "DICKSONX");
     55     }
     56 
     57     public void testJaroDistance() {
     58         assertFloat(0.600f, "Donny", "Duane");
     59     }
     60 
     61     public void testPoorMatch() {
     62         assertFloat(0.467f, "Johny", "Duane");
     63     }
     64 
     65     public void testNoMatches() {
     66         assertFloat(0, "Abcd", "Efgh");
     67     }
     68 
     69     private void assertFloat(float expected, String name1, String name2) {
     70         byte[] s1 = Hex.decodeHex(NameNormalizer.normalize(name1));
     71         byte[] s2 = Hex.decodeHex(NameNormalizer.normalize(name2));
     72 
     73         float actual = mNameDistance.getDistance(s1, s2);
     74         assertTrue("Expected Jaro-Winkler distance: " + expected + ", actual: " + actual,
     75                 Math.abs(actual - expected) < 0.001);
     76     }
     77 }
     78