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 package android.util.cts;
17 
18 import android.util.TimeUtils;
19 
20 import java.util.Calendar;
21 import java.util.TimeZone;
22 
23 import junit.framework.TestCase;
24 
25 public class TimeUtilsTest extends TestCase {
testUnitedStates()26     public void testUnitedStates() throws Exception {
27         String[] mainstream = new String[] {
28             "America/New_York", // Eastern
29             "America/Chicago", // Central
30             "America/Denver", // Mountain
31             "America/Los_Angeles", // Pacific
32             "America/Anchorage", // Alaska
33             "Pacific/Honolulu", // Hawaii, no DST
34         };
35 
36         for (String name : mainstream) {
37             TimeZone tz = TimeZone.getTimeZone(name);
38             Calendar c = Calendar.getInstance(tz);
39             TimeZone guess;
40 
41             c.set(2008, Calendar.OCTOBER, 20, 12, 00, 00);
42             guess = guessTimeZone(c, "us");
43             assertEquals(name, guess.getID());
44 
45             c.set(2009, Calendar.JANUARY, 20, 12, 00, 00);
46             guess = guessTimeZone(c, "us");
47             assertEquals(name, guess.getID());
48         }
49     }
50 
testWeirdUnitedStates()51     public void testWeirdUnitedStates() throws Exception {
52         String[] weird = new String[] {
53             "America/Phoenix", // Mountain, no DST
54             "America/Adak", // Same as Hawaii, but with DST
55         };
56 
57         for (String name : weird) {
58             TimeZone tz = TimeZone.getTimeZone(name);
59             Calendar c = Calendar.getInstance(tz);
60             TimeZone guess;
61 
62             c.set(2008, Calendar.OCTOBER, 20, 12, 00, 00);
63             guess = guessTimeZone(c, "us");
64             assertEquals(name, guess.getID());
65         }
66     }
67 
testOld()68     public void testOld() throws Exception {
69         String[] old = new String[] {
70             "America/Indiana/Indianapolis", // Eastern, formerly no DST
71         };
72 
73         for (String name : old) {
74             TimeZone tz = TimeZone.getTimeZone(name);
75             Calendar c = Calendar.getInstance(tz);
76             TimeZone guess;
77 
78             c.set(2005, Calendar.OCTOBER, 20, 12, 00, 00);
79             guess = guessTimeZone(c, "us");
80             assertEquals(name, guess.getID());
81         }
82     }
83 
testWorldWeird()84     public void testWorldWeird() throws Exception {
85         String[] world = new String[] {
86             // Distinguisable from Sydney only when DST not in effect
87             "au", "Australia/Lord_Howe",
88         };
89 
90         for (int i = 0; i < world.length; i += 2) {
91             String country = world[i];
92             String name = world[i + 1];
93 
94             TimeZone tz = TimeZone.getTimeZone(name);
95             Calendar c = Calendar.getInstance(tz);
96             TimeZone guess;
97 
98             c.set(2009, Calendar.JULY, 20, 12, 00, 00);
99             guess = guessTimeZone(c, country);
100             assertEquals(name, guess.getID());
101         }
102     }
103 
guessTimeZone(Calendar c, String country)104     private static TimeZone guessTimeZone(Calendar c, String country) {
105         return TimeUtils.getTimeZone(c.get(Calendar.ZONE_OFFSET) + c.get(Calendar.DST_OFFSET),
106                                      c.get(Calendar.DST_OFFSET) != 0,
107                                      c.getTimeInMillis(),
108                                      country);
109     }
110 }
111