Related to Issue 205, but not the direct issue: read both copies of the format info...
[zxing.git] / core / test / src / com / google / zxing / qrcode / decoder / FormatInformationTestCase.java
1 /*
2  * Copyright 2007 ZXing authors
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.google.zxing.qrcode.decoder;
18
19 import junit.framework.TestCase;
20
21 /**
22  * @author Sean Owen
23  */
24 public final class FormatInformationTestCase extends TestCase {
25
26   private static final int MASKED_TEST_FORMAT_INFO = 0x2BED;
27   private static final int UNMASKED_TEST_FORMAT_INFO = MASKED_TEST_FORMAT_INFO ^ 0x5412;
28
29   public void testBitsDiffering() {
30     assertEquals(0, FormatInformation.numBitsDiffering(1, 1));
31     assertEquals(1, FormatInformation.numBitsDiffering(0, 2));
32     assertEquals(2, FormatInformation.numBitsDiffering(1, 2));
33     assertEquals(32, FormatInformation.numBitsDiffering(-1, 0));
34   }
35
36   public void testDecode() {
37     // Normal case
38     FormatInformation expected =
39         FormatInformation.decodeFormatInformation(MASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO);
40     assertEquals((byte) 0x07, expected.getDataMask());
41     assertSame(ErrorCorrectionLevel.Q, expected.getErrorCorrectionLevel());
42     // where the code forgot the mask!
43     assertEquals(expected,
44                  FormatInformation.decodeFormatInformation(UNMASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO));
45   }
46
47   public void testDecodeWithBitDifference() {
48     FormatInformation expected =
49         FormatInformation.decodeFormatInformation(MASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO);
50     // 1,2,3,4 bits difference
51     assertEquals(expected, FormatInformation.decodeFormatInformation(
52         MASKED_TEST_FORMAT_INFO ^ 0x01, MASKED_TEST_FORMAT_INFO ^ 0x01));
53     assertEquals(expected, FormatInformation.decodeFormatInformation(
54         MASKED_TEST_FORMAT_INFO ^ 0x03, MASKED_TEST_FORMAT_INFO ^ 0x03));
55     assertEquals(expected, FormatInformation.decodeFormatInformation(
56         MASKED_TEST_FORMAT_INFO ^ 0x07, MASKED_TEST_FORMAT_INFO ^ 0x07));
57     assertNull(FormatInformation.decodeFormatInformation(
58         MASKED_TEST_FORMAT_INFO ^ 0x0F, MASKED_TEST_FORMAT_INFO ^ 0x0F));
59   }
60
61   public void testDecodeWithMisread() {
62     FormatInformation expected =
63         FormatInformation.decodeFormatInformation(MASKED_TEST_FORMAT_INFO, MASKED_TEST_FORMAT_INFO);
64     assertEquals(expected, FormatInformation.decodeFormatInformation(
65         MASKED_TEST_FORMAT_INFO ^ 0x03, MASKED_TEST_FORMAT_INFO ^ 0x0F));
66   }
67
68 }