content: /**
   * Licensed 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.aurora.common.util.testing;
  
  import org.apache.aurora.common.quantity.Amount;
  import org.apache.aurora.common.quantity.Time;
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  /**
   * @author John Sirois
   */
  public class FakeClockTest {
    private FakeTicker fakeTicker;
  
    @Before
    public void setUp() {
      fakeTicker = new FakeTicker();
    }
  
    @Test
    public void testNow() throws InterruptedException {
      assertEquals("A fake clock should start out at time 0", 0, fakeTicker.read());
  
      fakeTicker.setNowNanos(42L);
      assertEquals("A fake clock's time should only be controled by setNow", 42L, fakeTicker.read());
  
      long start = System.nanoTime();
      Thread.sleep(10L);
      assertTrue(System.nanoTime() - start > 0);
      assertEquals("A fake clock's time should only be controled by setNow", 42L, fakeTicker.read());
    }
  
    @Test
    public void testWaitFor() {
      fakeTicker.waitNanos(42L);
      assertEquals(42L, fakeTicker.read());
  
      fakeTicker.waitNanos(42L);
      assertEquals(84L, fakeTicker.read());
    }
  
    @Test
    public void testAdvance() {
      fakeTicker.advance(Amount.of(42L, Time.NANOSECONDS));
      assertEquals(42L, fakeTicker.read());
  
      fakeTicker.advance(Amount.of(42L, Time.NANOSECONDS));
      assertEquals(84L, fakeTicker.read());
  
      fakeTicker.advance(Amount.of(-42L, Time.NANOSECONDS));
      assertEquals(42L, fakeTicker.read());
  
      fakeTicker.advance(Amount.of(-43L, Time.NANOSECONDS));
      assertEquals(-1L,fakeTicker.read());
    }
  }
  