1 /*
2  * Copyright 2018, 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.common;
18 
19 import static com.google.common.truth.Truth.assertThat;
20 
21 import org.junit.Rule;
22 import org.junit.Test;
23 import org.junit.rules.ExpectedException;
24 import org.junit.runner.RunWith;
25 import org.junit.runners.JUnit4;
26 
27 /** Tests for {@link TimeUtils}. */
28 @RunWith(JUnit4.class)
29 public final class TimeUtilsTest {
30 
31   @Rule public ExpectedException thrown = ExpectedException.none();
32 
33   @Test
compareLongs()34   public void compareLongs() {
35     assertThat(TimeUtils.compareLongs(-1L, 1L)).isLessThan(0);
36     assertThat(TimeUtils.compareLongs(10L, 10L)).isEqualTo(0);
37     assertThat(TimeUtils.compareLongs(1L, 0L)).isGreaterThan(0);
38   }
39 
40   @Test
checkedAdd_TooLow()41   public void checkedAdd_TooLow() {
42     thrown.expect(ArithmeticException.class);
43     thrown.expectMessage("Long sum overflow: x=-9223372036854775807, y=-2");
44     TimeUtils.checkedAdd(Long.MIN_VALUE + 1, -2);
45   }
46 
47   @Test
checkedAdd_TooHigh()48   public void checkedAdd_TooHigh() {
49     thrown.expect(ArithmeticException.class);
50     thrown.expectMessage("Long sum overflow: x=9223372036854775806, y=2");
51     TimeUtils.checkedAdd(Long.MAX_VALUE - 1, 2);
52   }
53 
54   @Test
checkedAdd_Valid()55   public void checkedAdd_Valid() {
56     assertThat(TimeUtils.checkedAdd(1, 2)).isEqualTo(3);
57     assertThat(TimeUtils.checkedAdd(Integer.MAX_VALUE, Integer.MAX_VALUE))
58         .isEqualTo(2L * Integer.MAX_VALUE);
59   }
60 }
61