content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package org.apache.bookkeeper.common.util;
  
  import static org.apache.bookkeeper.common.util.MathUtils.findNextPositivePowerOfTwo;
  import static org.apache.bookkeeper.common.util.MathUtils.nowInNano;
  import static org.apache.bookkeeper.common.util.MathUtils.signSafeMod;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import org.junit.Test;
  
  /**
   * Unit test of {@link MathUtils}.
   */
  public class TestMathUtils {
  
      @Test
      public void testSignSafeMod() {
          assertEquals(1, signSafeMod(11, 2));
          assertEquals(1, signSafeMod(-11, 2));
          assertEquals(1, signSafeMod(11, -2));
          assertEquals(-3, signSafeMod(-11, -2));
      }
  
      @Test
      public void testFindNextPositivePowerOfTwo() {
          assertEquals(16384, findNextPositivePowerOfTwo(12345));
      }
  
      @Test
      public void testNowInNanos() {
          long nowInNanos = nowInNano();
          assertTrue(System.nanoTime() >= nowInNanos);
      }
  
  }
  