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
   *
   *     https://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.avro.ipc.stats;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  import org.junit.jupiter.api.Test;
  
  public class TestStopwatch {
    @Test
    void normal() {
      FakeTicks f = new FakeTicks();
      Stopwatch s = new Stopwatch(f);
      f.passTime(10);
      s.start();
      f.passTime(20);
      assertEquals(20, s.elapsedNanos());
      f.passTime(40);
      s.stop();
      f.passTime(80);
      assertEquals(60, s.elapsedNanos());
    }
  
    @Test
    void notStarted1() {
      assertThrows(IllegalStateException.class, () -> {
        FakeTicks f = new FakeTicks();
        Stopwatch s = new Stopwatch(f);
        s.elapsedNanos();
      });
    }
  
    @Test
    void notStarted2() {
      assertThrows(IllegalStateException.class, () -> {
        FakeTicks f = new FakeTicks();
        Stopwatch s = new Stopwatch(f);
        s.stop();
      });
    }
  
    @Test
    void twiceStarted() {
      assertThrows(IllegalStateException.class, () -> {
        FakeTicks f = new FakeTicks();
        Stopwatch s = new Stopwatch(f);
        s.start();
        s.start();
      });
    }
  
    @Test
    void twiceStopped() {
      assertThrows(IllegalStateException.class, () -> {
        FakeTicks f = new FakeTicks();
        Stopwatch s = new Stopwatch(f);
        s.start();
        s.stop();
        s.stop();
      });
    }
  
    @Test
    void systemStopwatch() {
      Stopwatch s = new Stopwatch(Stopwatch.SYSTEM_TICKS);
      s.start();
      s.stop();
      assertTrue(s.elapsedNanos() >= 0);
    }
  
  }
  