log4j-core/src/test/java/org/apache/logging/log4j/core/time/SystemNanoClockTest.java

/*
 * 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.logging.log4j.core.time;

import org.junit.Test;

import java.util.concurrent.TimeUnit;

import static org.junit.Assert.assertTrue;

/**
 * Tests the SystemNanoClock.
 */
public class SystemNanoClockTest {

    @Test
    public void testReturnsSystemNanoTime() {
        final NanoClock clock = new SystemNanoClock();
        final long expected = System.nanoTime();
        final long actual = clock.nanoTime();
        assertTrue("smal difference", actual - expected < TimeUnit.SECONDS.toNanos(1));
    }

}