### Question:
Pcaps { public static PcapHandle openOffline( String filePath ) throws PcapNativeException { if (filePath == null) { StringBuilder sb = new StringBuilder(); sb.append("filePath: ").append(filePath); throw new NullPointerException(sb.toString()); } PcapErrbuf errbuf = new PcapErrbuf(); Pointer handle = NativeMappings.pcap_open_offline(filePath, errbuf); if (handle == null || errbuf.length() != 0) { throw new PcapNativeException(errbuf.toString()); } return new PcapHandle(handle, TimestampPrecision.MICRO); } private  Pcaps(); static List<PcapNetworkInterface> findAllDevs(); static PcapNetworkInterface getDevByAddress(
    InetAddress addr
  ); static PcapNetworkInterface getDevByName(
    String name
  ); static String lookupDev(); static Inet4NetworkAddress lookupNet(
    String devName
  ); static PcapHandle openOffline(
    String filePath
  ); static PcapHandle openOffline(
    String filePath, TimestampPrecision precision
  ); static PcapHandle openDead(
    DataLinkType dlt, int snaplen
  ); static PcapHandle openDead(
    DataLinkType dlt, int snaplen, TimestampPrecision precision
  ); static BpfProgram compileFilter(
    int snaplen, DataLinkType dlt, String bpfExpression,
    BpfCompileMode mode, Inet4Address netmask
  ); static DataLinkType dataLinkNameToVal(
    String name
  ); static String dataLinkTypeToName(
    DataLinkType dlt
  ); static String dataLinkValToName(
    int dataLinkVal
  ); static String dataLinkTypeToDescription(
    DataLinkType dlt
  ); static String dataLinkValToDescription(
    int dataLinkVal
  ); static String strError(int error); static String libVersion(); static String toBpfString(InetAddress inetAddr); static String toBpfString(MacAddress macAddr);  }### Answer:
@Test public void testOpenOffline() { }
@Test public void testOpenOfflineWithTimestampPrecision() throws Exception { if (!Boolean.getBoolean(Constants.ENABLE_TIMESTAMP_PRECISION_TESTS_KEY)) { return; } PcapHandle phNano = Pcaps.openOffline( "src/test/resources/org/pcap4j/core/" + "PcapsTest.testOpenOfflineWithTimestampPrecision.pcap", TimestampPrecision.NANO ); phNano.getNextRawPacket(); assertEquals(1434220771517L, phNano.getTimestamp().getTime()); assertEquals(517995677, phNano.getTimestamp().getNanos()); phNano.close(); PcapHandle phMicro = Pcaps.openOffline( "src/test/resources/org/pcap4j/core/" + "PcapsTest.testOpenOfflineWithTimestampPrecision.pcap", TimestampPrecision.MICRO ); phMicro.getNextRawPacket(); System.out.println(phMicro.getTimestamp().getTime()); System.out.println(phMicro.getTimestamp().getNanos()); assertEquals(1434220771517L, phMicro.getTimestamp().getTime()); assertEquals(517995000, phMicro.getTimestamp().getNanos()); phMicro.close(); }