1 /*
2  * Copyright 2016-17, OpenCensus 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 io.opencensus.trace;
18 
19 import static com.google.common.truth.Truth.assertThat;
20 
21 import com.google.common.testing.EqualsTester;
22 import java.util.Arrays;
23 import org.junit.Test;
24 import org.junit.runner.RunWith;
25 import org.junit.runners.JUnit4;
26 
27 /** Unit tests for {@link TraceId}. */
28 @RunWith(JUnit4.class)
29 public class TraceIdTest {
30   private static final byte[] firstBytes =
31       new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 'a'};
32   private static final byte[] secondBytes =
33       new byte[] {(byte) 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 'A'};
34   private static final TraceId first = TraceId.fromBytes(firstBytes);
35   private static final TraceId second = TraceId.fromBytes(secondBytes);
36 
37   @Test
invalidTraceId()38   public void invalidTraceId() {
39     assertThat(TraceId.INVALID.getBytes()).isEqualTo(new byte[16]);
40   }
41 
42   @Test
isValid()43   public void isValid() {
44     assertThat(TraceId.INVALID.isValid()).isFalse();
45     assertThat(first.isValid()).isTrue();
46     assertThat(second.isValid()).isTrue();
47   }
48 
49   @Test
getBytes()50   public void getBytes() {
51     assertThat(first.getBytes()).isEqualTo(firstBytes);
52     assertThat(second.getBytes()).isEqualTo(secondBytes);
53   }
54 
55   @Test
fromLowerBase16()56   public void fromLowerBase16() {
57     assertThat(TraceId.fromLowerBase16("00000000000000000000000000000000"))
58         .isEqualTo(TraceId.INVALID);
59     assertThat(TraceId.fromLowerBase16("00000000000000000000000000000061")).isEqualTo(first);
60     assertThat(TraceId.fromLowerBase16("ff000000000000000000000000000041")).isEqualTo(second);
61   }
62 
63   @Test
toLowerBase16()64   public void toLowerBase16() {
65     assertThat(TraceId.INVALID.toLowerBase16()).isEqualTo("00000000000000000000000000000000");
66     assertThat(first.toLowerBase16()).isEqualTo("00000000000000000000000000000061");
67     assertThat(second.toLowerBase16()).isEqualTo("ff000000000000000000000000000041");
68   }
69 
70   @Test
traceId_CompareTo()71   public void traceId_CompareTo() {
72     assertThat(first.compareTo(second)).isGreaterThan(0);
73     assertThat(second.compareTo(first)).isLessThan(0);
74     assertThat(first.compareTo(TraceId.fromBytes(firstBytes))).isEqualTo(0);
75   }
76 
77   @Test
traceId_EqualsAndHashCode()78   public void traceId_EqualsAndHashCode() {
79     EqualsTester tester = new EqualsTester();
80     tester.addEqualityGroup(TraceId.INVALID, TraceId.INVALID);
81     tester.addEqualityGroup(first, TraceId.fromBytes(Arrays.copyOf(firstBytes, firstBytes.length)));
82     tester.addEqualityGroup(
83         second, TraceId.fromBytes(Arrays.copyOf(secondBytes, secondBytes.length)));
84     tester.testEquals();
85   }
86 
87   @Test
traceId_ToString()88   public void traceId_ToString() {
89     assertThat(TraceId.INVALID.toString()).contains("00000000000000000000000000000000");
90     assertThat(first.toString()).contains("00000000000000000000000000000061");
91     assertThat(second.toString()).contains("ff000000000000000000000000000041");
92   }
93 }
94