1 /*
2  * Copyright (C) 2014 The Guava Authors
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5  * in compliance with the License. You may obtain a copy of the License at
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software distributed under the License
10  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11  * or implied. See the License for the specific language governing permissions and limitations under
12  * the License.
13  */
14 
15 package com.google.common.cache;
16 
17 import static com.google.common.truth.Truth.assertThat;
18 
19 import junit.framework.TestCase;
20 
21 /** Unit tests for {@link LongAdder}. */
22 public class LongAdderTest extends TestCase {
23 
24   /**
25    * No-op null-pointer test for {@link LongAdder} to override the {@link PackageSanityTests}
26    * version, which checks package-private methods that we don't want to have to annotate as {@code
27    * Nullable} because we don't want diffs from jsr166e.
28    */
testNulls()29   public void testNulls() {}
30 
testOverflows()31   public void testOverflows() {
32     LongAdder longAdder = new LongAdder();
33     longAdder.add(Long.MAX_VALUE);
34     assertThat(longAdder.sum()).isEqualTo(Long.MAX_VALUE);
35     longAdder.add(1);
36     // silently overflows; is this a bug?
37     // See https://github.com/google/guava/issues/3503
38     assertThat(longAdder.sum()).isEqualTo(-9223372036854775808L);
39   }
40 }
41