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 com.datastax.oss.driver.internal.core.os;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  import java.time.Instant;
  import java.time.temporal.ChronoUnit;
  import java.util.Optional;
  import org.junit.Test;
  
  /**
   * Explicitly test native impl based on jnr's POSIX impl. This test should pass on any platform
   * which is supported by jnr.
   */
  public class JnrLibcTest {
  
    @Test
    public void should_be_available() {
  
      Libc impl = new JnrLibc();
      assertThat(impl.available()).isTrue();
    }
  
    @Test
    public void should_support_getpid() {
      Libc impl = new JnrLibc();
      Optional<Integer> val = impl.getpid();
      assertThat(val).isNotEmpty();
      assertThat(val.get()).isGreaterThan(1);
    }
  
    @Test
    public void should_support_gettimeofday() {
      Libc impl = new JnrLibc();
      Optional<Long> val = impl.gettimeofday();
      assertThat(val).isNotEmpty();
      assertThat(val.get()).isGreaterThan(0);
  
      Instant now = Instant.now();
      Instant rvInstant = Instant.EPOCH.plus(val.get(), ChronoUnit.MICROS);
      assertThat(rvInstant.isAfter(now.minusSeconds(1))).isTrue();
      assertThat(rvInstant.isBefore(now.plusSeconds(1))).isTrue();
    }
  }
  