001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.metrics.impl;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021
022import org.apache.hadoop.hbase.metrics.Counter;
023import org.apache.hadoop.hbase.testclassification.SmallTests;
024import org.junit.jupiter.api.BeforeEach;
025import org.junit.jupiter.api.Tag;
026import org.junit.jupiter.api.Test;
027
028/**
029 * Test class for {@link CounterImpl}.
030 */
031@Tag(SmallTests.TAG)
032public class TestCounterImpl {
033
034  private Counter counter;
035
036  @BeforeEach
037  public void setup() {
038    this.counter = new CounterImpl();
039  }
040
041  @Test
042  public void testCounting() {
043    counter.increment();
044    assertEquals(1L, counter.getCount());
045    counter.increment();
046    assertEquals(2L, counter.getCount());
047    counter.increment(2L);
048    assertEquals(4L, counter.getCount());
049    counter.increment(-1L);
050    assertEquals(3L, counter.getCount());
051
052    counter.decrement();
053    assertEquals(2L, counter.getCount());
054    counter.decrement();
055    assertEquals(1L, counter.getCount());
056    counter.decrement(4L);
057    assertEquals(-3L, counter.getCount());
058    counter.decrement(-3L);
059    assertEquals(0L, counter.getCount());
060  }
061}