// =================================================================================================
// Copyright 2011 Twitter, Inc.
// -------------------------------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this work except in compliance with the License.
// You may obtain a copy of the License in the LICENSE file, or 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 com.twitter.common.util.testing;
import com.twitter.common.quantity.Amount;
import com.twitter.common.quantity.Time;
import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* @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());
}
}