/*
The software in this package is distributed under the GNU General
Public License version 2 (with a special exception described below).

A copy of GNU General Public License (GPL) is included in this distribution,
in the file COPYING.GPL.

As a special exception, if other files instantiate templates or use macros
or inline functions from this file, or you compile this file and link it
with other works to produce a work based on this file, this file
does not by itself cause the resulting work to be covered
by the GNU General Public License.

However the source code for this file must still be made available
in accordance with section (3) of the GNU General Public License.

This exception does not invalidate any other reasons why a work based
on this file might be covered by the GNU General Public License.
*/
/** @file
 * @brief unit test for time related functions.
 *
 * @copyright Copyright © 2001-2008 by Intra2net AG
 *
 */

#define BOOST_TEST_DYN_LINK
#include <boost/test/unit_test.hpp>

#include <timefunc.hxx>
#include <filefunc.hxx>

#include <unistd.h>
#include <set>

using namespace std;
using namespace I2n;
using namespace I2n::Time;

class TestTimeFuncFixture
{
protected:
   typedef std::list< std::string > StringList;
   std::set<std::string>  used_check_files;

   std::string get_check_file_path(std::string tag)
   {
      std::string result;
      result= "__unittest__" + tag + ".dat";
      used_check_files.insert(result);
      return result;
   } // eo get_check_file_path

   void remove_check_files()
   {
      for (std::set<std::string>::iterator it= used_check_files.begin();
            it != used_check_files.end();
            ++it)
      {
         std::string filepath(*it);
         if (path_exists(filepath))
         {
            unlink(filepath);
         }
         //TODO
      }
      used_check_files.clear();
   } // eo remove_check_files

public:
    TestTimeFuncFixture()
    {
    }

    ~TestTimeFuncFixture()
    {
        remove_check_files();
    }
};

BOOST_FIXTURE_TEST_SUITE(TestTimeFunc, TestTimeFuncFixture)

BOOST_AUTO_TEST_CASE(AddIntervalsDisjoint)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100 ) );
    intervals.add( Interval( 600, 620 ) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 2u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 100u, intervals.front().upper_bound() );

    BOOST_CHECK_EQUAL( 600u, intervals.back().lower_bound() );
    BOOST_CHECK_EQUAL( 620u, intervals.back().upper_bound() );
} // eo AddIntervalsDisjoint()



BOOST_AUTO_TEST_CASE(AddIntervalsInclude)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100 ) );
    intervals.add( Interval( 10, 80 ) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 100u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( false, intervals.front().changed() );
} // eo AddIntervalsInclude()



BOOST_AUTO_TEST_CASE(AddIntervalsEmbrace)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100 ) );
    intervals.add( Interval( 5, 120 ) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 5u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 120u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo AddIntervalsEmbrace()



BOOST_AUTO_TEST_CASE(AddIntervalsJoin1)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100 ) );
    intervals.add( Interval( 60, 120 ) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 120u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo AddIntervalsJoin1()



BOOST_AUTO_TEST_CASE(AddIntervalsJoin1b)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100 ) );
    intervals.add( Interval( 100, 120 ) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 120u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo AddIntervalsJoin1b()



BOOST_AUTO_TEST_CASE(AddIntervalsJoin2)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100 ) );
    intervals.add( Interval( 200, 250 ) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 2u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 100u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( 200u, intervals.back().lower_bound() );
    BOOST_CHECK_EQUAL( 250u, intervals.back().upper_bound() );

    // now add the gap; the intervals should collapse to one covering all:
    intervals.add( Interval(100, 200) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 250u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo AddIntervalsJoin2()



BOOST_AUTO_TEST_CASE(SubIntervalsDisjoint)
{
    Intervals intervals;

    intervals.add( Interval(10, 100) );
    intervals.sub( Interval(0, 10) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 100u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( false, intervals.front().changed() );
} // eo SubIntervalsDisjoint()



BOOST_AUTO_TEST_CASE(SubIntervalsExact)
{
    Intervals intervals;

    intervals.add( Interval(10, 100) );
    intervals.sub( Interval(10, 100) );

    BOOST_CHECK_EQUAL( true, intervals.empty() );
    BOOST_CHECK_EQUAL( 0u, intervals.size() );
} // eo SubIntervalsExact()



BOOST_AUTO_TEST_CASE(SubIntervalsSplit1)
{
    Intervals intervals;

    intervals.add( Interval(10, 100) );
    intervals.sub( Interval(20, 40) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 2u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 20u, intervals.front().upper_bound() );

    BOOST_CHECK_EQUAL( 40u, intervals.back().lower_bound() );
    BOOST_CHECK_EQUAL( 100u, intervals.back().upper_bound() );
    BOOST_CHECK_EQUAL( false, intervals.front().changed() );
    BOOST_CHECK_EQUAL( true, intervals.back().changed() );
} // eo SubIntervalsSplit1()


BOOST_AUTO_TEST_CASE(SubIntervalsCutFront)
{
    Intervals intervals;

    intervals.add( Interval(10, 100) );
    intervals.sub( Interval(10, 20) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 20u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 100u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo SubIntervalsCutFront()


BOOST_AUTO_TEST_CASE(SubIntervalsCutBack)
{
    Intervals intervals;

    intervals.add( Interval(10, 100) );
    intervals.sub( Interval(87, 100) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 10u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 87u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo SubIntervalsCutBack()



BOOST_AUTO_TEST_CASE(SubIntervalsCutMore)
{
    Intervals intervals;

    intervals.add( Interval( 10, 100) );
    intervals.add( Interval(110, 200) );
    intervals.add( Interval(210, 300) );

    // this should remove the first 2 intervals and cut the third:
    intervals.sub( Interval(8, 220) );

    BOOST_CHECK_EQUAL( false, intervals.empty() );
    BOOST_CHECK_EQUAL( 1u, intervals.size() );

    BOOST_CHECK_EQUAL( 220u, intervals.front().lower_bound() );
    BOOST_CHECK_EQUAL( 300u, intervals.front().upper_bound() );
    BOOST_CHECK_EQUAL( true, intervals.front().changed() );
} // eo SubIntervalsCutMore()


BOOST_AUTO_TEST_CASE(IntervalComparisons)
{
    Intervals intervals1;
    Intervals intervals2;

    intervals1.add( Interval( 10, 120) );

    intervals2.add( Interval( 10, 110 ) );
    intervals2.add( Interval( 100, 120 ) );

    BOOST_CHECK_EQUAL( 1u, intervals2.size() );

    BOOST_CHECK( intervals1 == intervals2 );
    BOOST_CHECK_EQUAL( true, intervals1.contains( intervals2 ));
    BOOST_CHECK_EQUAL( true, intervals2.contains( intervals1 ));

    intervals2.sub( Interval( 40, 50) );

    BOOST_CHECK( intervals1 != intervals2 );
    BOOST_CHECK_EQUAL( true, intervals1.contains( intervals2 ));
    BOOST_CHECK_EQUAL( false, intervals2.contains( intervals1 ));
} // eo IntervalComparisons()



BOOST_AUTO_TEST_CASE(MonotonicClock)
{
    long sec0, nsec0;
    long sec1, nsec1;

    bool res = monotonic_clock_gettime(sec0,nsec0);
    BOOST_CHECK_EQUAL( true, res );

    usleep(250000);
    res= monotonic_clock_gettime(sec1,nsec1);
    BOOST_CHECK_EQUAL( true, res);

    long delta_sec = sec1 - sec0;
    long delta_nsec= nsec1 - nsec0;

    long delta_millisec= ( delta_nsec / 1000000L) + delta_sec * 1000L;

    BOOST_CHECK( delta_millisec >= 250 - /*fuzz*/ 1);
    BOOST_CHECK( delta_millisec < 300 );
} // eo MonotonicClock()

BOOST_AUTO_TEST_CASE(WeekInvalid)
{
    Week week("99999999");
    BOOST_CHECK_EQUAL(false, week.is_valid());
    BOOST_CHECK_EQUAL(string(""), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString1)
{
    Week week("");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string(""), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString2)
{
    Week week("0123456");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon-Sun"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString3)
{
    Week week("123456");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon-Sat"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString4)
{
    Week week("012345");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon-Fri, Sun"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString5)
{
    Week week("1256");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon, Tue, Fri, Sat"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString6)
{
    Week week("0246");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Tue, Thu, Sat, Sun"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString7)
{
    Week week("135");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon, Wed, Fri"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString8)
{
    Week week("15");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon, Fri"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString9)
{
    Week week("06");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Sat, Sun"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString10)
{
    Week week("056");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Fri-Sun"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString11)
{
    Week week("0");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Sun"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString12)
{
    Week week("6");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Sat"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(WeekDisplayString13)
{
    Week week("123");
    BOOST_CHECK_EQUAL(true, week.is_valid());
    BOOST_CHECK_EQUAL(string("Mon-Wed"), week.get_displaystring());
}

BOOST_AUTO_TEST_CASE(FormatFullTime)
{
    time_t seconds = 1318844005;

    BOOST_CHECK_EQUAL("17.10.2011 11:33", format_full_time(seconds));
}

BOOST_AUTO_TEST_CASE(DateToSeconds1)
{
    // no DST
    BOOST_CHECK_EQUAL(1325372400, date_to_seconds("2012-01-01"));
}

BOOST_AUTO_TEST_CASE(DateToSeconds2)
{
    // DST
    BOOST_CHECK_EQUAL(1341093600, date_to_seconds("2012-07-01"));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_T)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("10:11:24",
                      format_iso8601 (moment, true, false, true, false));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_TZ_local)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("11:11:24Z+0100",
                      format_iso8601 (moment, false, false, true, true));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_TZ)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("10:11:24Z+0000",
                      format_iso8601 (moment, true, false, true, true));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_DTZ_local)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("2018-01-09T11:11:24Z+0100",
                      format_iso8601 (moment, false, true, true, true));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_DTZ)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("2018-01-09T10:11:24Z+0000",
                      format_iso8601 (moment, true, true, true, true));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_DT)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("2018-01-09T10:11:24",
                      format_iso8601 (moment, true, true, true, false));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_D)
{
    const time_t moment = 1515492684;
    BOOST_CHECK_EQUAL("2018-01-09",
                      format_iso8601 (moment, true, true, false, false));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_DTZ_struct_tm)
{
    struct tm helau;
    helau.tm_sec    = 11;
    helau.tm_min    = 11;
    helau.tm_hour   = 11;
    helau.tm_mday   = 11;
    helau.tm_mon    = 10;
    helau.tm_year   = 2018 - 1900;
    helau.tm_wday   = 0;
    helau.tm_yday   = 315;
    helau.tm_isdst  = 0;
    helau.tm_gmtoff = 0;
    helau.tm_zone   = NULL;

    BOOST_CHECK_EQUAL("2018-11-11T11:11:11Z+0000",
                      format_iso8601 (helau, true, true, true));
}

BOOST_AUTO_TEST_CASE(FormatISO8601_DTZ_struct_timespec)
{
    struct timespec ts = { 1541934671, 11 };

    BOOST_CHECK_EQUAL("2018-11-11T11:11:11Z+0000",
                      format_iso8601 (ts, true, true, true, true));
}

BOOST_AUTO_TEST_SUITE(Clock)

    BOOST_AUTO_TEST_CASE(ctor_simple)
    {
        I2n::clock::Time t;

        BOOST_CHECK_EQUAL(t.get_sec  (), 0);
        BOOST_CHECK_EQUAL(t.get_nsec (), 0);
    }

    BOOST_AUTO_TEST_CASE(ctor_type)
    {
        I2n::clock::Time t (I2n::clock::type::real);

        BOOST_CHECK_EQUAL(t.get_sec  (), 0);
        BOOST_CHECK_EQUAL(t.get_nsec (), 0);
    }

    BOOST_AUTO_TEST_CASE(ctor_variant)
    {
        I2n::clock::Time t (I2n::clock::type::cpu,
                            I2n::clock::type::thread);

        BOOST_CHECK_EQUAL(t.get_sec  (), 0);
        BOOST_CHECK_EQUAL(t.get_nsec (), 0);
    }

    BOOST_AUTO_TEST_CASE(initializer_now)
    {
        boost::optional<I2n::clock::Time> t = I2n::clock::now ();

        BOOST_CHECK(t);
        BOOST_CHECK_GT(t->get_sec (), 0);
        BOOST_CHECK_EQUAL(t->err, 0);
    }

    BOOST_AUTO_TEST_CASE(initializer_zero)
    {
        I2n::clock::Time stundenull = I2n::clock::zero ();

        BOOST_CHECK_EQUAL(stundenull.get_sec  (), 0);
        BOOST_CHECK_EQUAL(stundenull.get_nsec (), 0);
        BOOST_CHECK_EQUAL(stundenull.err, 0);
    }

    BOOST_AUTO_TEST_CASE(member_set_now)
    {
        I2n::clock::Time t;

        BOOST_CHECK(t.set ());

        BOOST_CHECK_NE(t.get_sec (), 0);
    }

    BOOST_AUTO_TEST_CASE(member_set_value)
    {
        I2n::clock::Time t;

        t.set (42, 42);

        BOOST_CHECK_EQUAL(t.get_sec  (), 42);
        BOOST_CHECK_EQUAL(t.get_nsec (), 42);
    }

    BOOST_AUTO_TEST_CASE(member_set_value_type)
    {
        I2n::clock::Time t;

        t.set (42, 42, I2n::clock::type::real, I2n::clock::type::exact);

        BOOST_CHECK_EQUAL(t.get_sec  (), 42);
        BOOST_CHECK_EQUAL(t.get_nsec (), 42);
    }

    BOOST_AUTO_TEST_CASE(member_add_parts)
    {
        I2n::clock::Time t;

        t.set (42, 42);
        t.add (2187, 2187);

        BOOST_CHECK_EQUAL(t.get_sec  (), 2229);
        BOOST_CHECK_EQUAL(t.get_nsec (), 2229);
    }

    BOOST_AUTO_TEST_CASE(member_sub_parts)
    {
        I2n::clock::Time t;

        t.set (2, 0L);
        t.subtract (1, 1L);

        BOOST_CHECK_EQUAL(t.get_sec  (), 0);
        BOOST_CHECK_EQUAL(t.get_nsec (), 999999999);
    }

    BOOST_AUTO_TEST_CASE(member_sub_Time)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (42, 42L);
        t2.set (42,  0L);

        t1.subtract (t2);

        BOOST_CHECK_EQUAL(t1.get_sec  (),  0);
        BOOST_CHECK_EQUAL(t1.get_nsec (), 42L);
    }

    BOOST_AUTO_TEST_CASE(member_diff)
    {
        static const time_t five = 5 * 365 * 24 * 3600;

        I2n::clock::Time t1 (42, 1337);
        I2n::clock::Time t2 = t1 + five;;
        I2n::clock::Time t3 = t1 - five;;

        BOOST_CHECK_EQUAL(t2, I2n::clock::Time ((time_t)42 + five, 1337));
        BOOST_CHECK_EQUAL(t3, I2n::clock::Time ((time_t)42 - five, 1337));
        BOOST_CHECK_EQUAL(t1.difference (t3), t3.difference (t1));
        BOOST_CHECK_EQUAL(t3.difference (t3), t3.difference (t3));
    }

    BOOST_AUTO_TEST_CASE(op_copyassign)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        BOOST_CHECK(t1.set ());

        t2 = t1;

        BOOST_CHECK_EQUAL(t1.get_sec  (), t2.get_sec  ());
        BOOST_CHECK_EQUAL(t1.get_nsec (), t2.get_nsec ());
    }

    BOOST_AUTO_TEST_CASE(op_equal)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        BOOST_CHECK(t1.set ());
        t2 = t1;

        BOOST_CHECK_EQUAL(t1, t2);
    }

    BOOST_AUTO_TEST_CASE(op_add_Time)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;
        I2n::clock::Time tsum;

        t1.set (2187, 2187);
        t2.set (1337, 1337);
        tsum = t1 + t2;

        BOOST_CHECK_EQUAL(tsum.get_sec  (), 3524);
        BOOST_CHECK_EQUAL(tsum.get_nsec (), 3524);
    }

    BOOST_AUTO_TEST_CASE(op_add_Time_carry)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;
        I2n::clock::Time tsum;

        t1.set (2187, 2187);
        t2.set (1300, 37L * 1000 * 1000 * 1000 + 1337);

        tsum = t1 + t2;

        BOOST_CHECK_EQUAL(tsum.get_sec  (), 3524);
        BOOST_CHECK_EQUAL(tsum.get_nsec (), 3524);
    }

    BOOST_AUTO_TEST_CASE(op_add_time_t)
    {
        I2n::clock::Time t1 (2187, 2187);
        time_t           t2 = 1337;
        I2n::clock::Time tsum;

        tsum = t1 + t2;

        BOOST_CHECK_EQUAL(tsum.get_sec  (), 3524);
        BOOST_CHECK_EQUAL(tsum.get_nsec (), 2187);
    }

    BOOST_AUTO_TEST_CASE(op_add_time_t_external)
    {
        time_t           t1 = 1337;
        I2n::clock::Time t2 (2187, 2187);
        I2n::clock::Time tsum;

        tsum = t1 + t2;

        BOOST_CHECK_EQUAL(tsum.get_sec  (), 3524);
        BOOST_CHECK_EQUAL(tsum.get_nsec (), 2187);
    }

    BOOST_AUTO_TEST_CASE(op_incr_Time)
    {
        I2n::clock::Time t1 (2187, 2187);
        I2n::clock::Time t2 (1337, 1337);

        t1 += t2;

        BOOST_CHECK_EQUAL(t1.get_sec  (), 3524);
        BOOST_CHECK_EQUAL(t1.get_nsec (), 3524);
    }

    BOOST_AUTO_TEST_CASE(op_incr_time_t)
    {
        I2n::clock::Time t1 (2187, 2187);
        time_t           t2 = 1337;

        t1 += t2;

        BOOST_CHECK_EQUAL(t1.get_sec  (), 3524);
        BOOST_CHECK_EQUAL(t1.get_nsec (), 2187);
    }

    BOOST_AUTO_TEST_CASE(op_subtract_Time)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;
        I2n::clock::Time tdiff;

        t1.set (2187, 2187);
        t2.set (1337, 1337);
        tdiff = t1 - t2;

        BOOST_CHECK_EQUAL(tdiff.get_sec  (), 850);
        BOOST_CHECK_EQUAL(tdiff.get_nsec (), 850);
    }

    BOOST_AUTO_TEST_CASE(op_subtract_time_t)
    {
        I2n::clock::Time t1 (2187, 2187);
        time_t           t2 = 1337;
        I2n::clock::Time tdiff;

        tdiff = t1 - t2;

        BOOST_CHECK_EQUAL(tdiff.get_sec  (), 850);
        BOOST_CHECK_EQUAL(tdiff.get_nsec (), 2187);
    }

    BOOST_AUTO_TEST_CASE(op_subtract_time_t_external)
    {
        time_t           t1 = 1337;
        I2n::clock::Time t2 (2187, 2187);
        I2n::clock::Time tdiff;

        tdiff = t1 - t2;

        BOOST_CHECK_EQUAL(tdiff.get_sec  (), -851);
        BOOST_CHECK_EQUAL(tdiff.get_nsec (), 999997813);
    }

    BOOST_AUTO_TEST_CASE(op_decr_Time)
    {
        I2n::clock::Time t1 (2187, 2187);
        I2n::clock::Time t2 (1337, 1337);

        t1 -= t2;

        BOOST_CHECK_EQUAL(t1.get_sec  (), 850);
        BOOST_CHECK_EQUAL(t1.get_nsec (), 850);
    }

    BOOST_AUTO_TEST_CASE(op_decr_time_t)
    {
        I2n::clock::Time t1 (2187, 2187);
        time_t           t2 = 1337;

        t1 -= t2;

        BOOST_CHECK_EQUAL(t1.get_sec  (), 850);
        BOOST_CHECK_EQUAL(t1.get_nsec (), 2187);
    }

    BOOST_AUTO_TEST_CASE(op_mult_scale)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (1, 1);
        t2 = t1 * 42;

        BOOST_CHECK_EQUAL(t2.get_sec  (), 42);
        BOOST_CHECK_EQUAL(t2.get_nsec (), 42);
    }

    BOOST_AUTO_TEST_CASE(op_mult_mutate)
    {
        I2n::clock::Time t1 (  42, 42);
        I2n::clock::Time t2 (1337,  0);

        t1 *=   2;
        t2 *= -10;

        BOOST_CHECK_EQUAL(t1.get_sec  (),     84);
        BOOST_CHECK_EQUAL(t1.get_nsec (),     84);
        BOOST_CHECK_EQUAL(t2.get_sec  (), -13370);
    }

    BOOST_AUTO_TEST_CASE(op_mult_scale_carry)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (1, 500 * 1000 * 1000);
        t2 = t1 * 3;

        BOOST_CHECK_EQUAL(t2.get_sec  (),  4);
        BOOST_CHECK_EQUAL(t2.get_nsec (),  500 * 1000 * 1000);
    }

    BOOST_AUTO_TEST_CASE(op_equals)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (50, 50);
        t2.set (50, 50);

        BOOST_CHECK_EQUAL(t1, t2);
    }

    BOOST_AUTO_TEST_CASE(compare_equal)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (42, 42);
        t2.set (42, 42);

        BOOST_CHECK_EQUAL(I2n::clock::compare (t1, t2), 0);
    }

    BOOST_AUTO_TEST_CASE(compare_equal_type)
    {
        I2n::clock::Time t1 (42, 42, I2n::clock::type::real);
        I2n::clock::Time t2 (42, 42, I2n::clock::type::cpu);
        I2n::clock::Time t3 (42,  0, I2n::clock::type::real);
        I2n::clock::Time t4 (42, 42, I2n::clock::type::real);

        BOOST_CHECK_NE(t1, t2);
        BOOST_CHECK_NE(t1, t3);
        BOOST_CHECK_EQUAL(t1, t4);
    }

    BOOST_AUTO_TEST_CASE(compare_ne_sec)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (  42, 42);
        t2.set (1337, 42);

        BOOST_CHECK_EQUAL(I2n::clock::compare (t1, t2), -1);
        BOOST_CHECK_EQUAL(I2n::clock::compare (t2, t1),  1);
    }

    BOOST_AUTO_TEST_CASE(compare_ne_nsec)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (42,   42);
        t2.set (42, 1337);

        BOOST_CHECK_EQUAL(I2n::clock::compare (t1, t2), -1);
        BOOST_CHECK_EQUAL(I2n::clock::compare (t2, t1),  1);
    }

    BOOST_AUTO_TEST_CASE(compare_ne_both)
    {
        I2n::clock::Time t1;
        I2n::clock::Time t2;

        t1.set (42, 2187);
        t2.set (23, 1337);

        BOOST_CHECK_EQUAL(I2n::clock::compare (t1, t2),  1);
        BOOST_CHECK_EQUAL(I2n::clock::compare (t2, t1), -1);
    }

    BOOST_AUTO_TEST_CASE(op_ineq_sec)
    {
        I2n::clock::Time t1 (1337);
        I2n::clock::Time t2 (2187);

        BOOST_CHECK_LT(t1, t2);
        BOOST_CHECK_GT(t2, t1);
    }

    BOOST_AUTO_TEST_CASE(op_ineq_nsec)
    {
        I2n::clock::Time t1 (1337, 23);
        I2n::clock::Time t2 (1337, 42);

        BOOST_CHECK_LT(t1, t2);
        BOOST_CHECK_GT(t2, t1);
    }

    BOOST_AUTO_TEST_CASE(op_ineq_both)
    {
        I2n::clock::Time t1 (2187, 23);
        I2n::clock::Time t2 (1337, 42);

        BOOST_CHECK_LT(t2, t1);
        BOOST_CHECK_GT(t1, t2);
    }

    BOOST_AUTO_TEST_CASE(op_eq_time_t)
    {
        boost::optional<I2n::clock::Time> t1  = I2n::clock::now ();
        const time_t                      t2  = time (NULL); /* race here */

        *t1 -= (time_t)42;

        BOOST_CHECK_NE(*t1,  t2);
        BOOST_CHECK_LT(*t1,  t2);
        BOOST_CHECK_GT( t2, *t1);
    }

    BOOST_AUTO_TEST_CASE(containers_list)
    {
        std::list<I2n::clock::Time> ts;

        ts.push_back (I2n::clock::zero ());
        ts.push_back (I2n::clock::zero ());

        BOOST_CHECK_EQUAL(ts.size (), 2);
    }

    BOOST_AUTO_TEST_CASE(containers_vec)
    {
        std::vector<I2n::clock::Time> ts;

        ts.push_back (I2n::clock::zero ());
        ts.push_back (I2n::clock::zero ());

        BOOST_CHECK_EQUAL(ts.size (), 2);
    }

    BOOST_AUTO_TEST_CASE(containers_set)
    {
        std::set<I2n::clock::Time> ts;

        ts.insert (I2n::clock::zero ());
        ts.insert (I2n::clock::Time (42, 2187));
        ts.insert (I2n::clock::zero ());

        BOOST_CHECK_EQUAL(ts.size (), 2);
    }

    BOOST_AUTO_TEST_CASE(FormatISO8601_T)
    {
        I2n::clock::Time t (42, 42);
        boost::optional<std::string> s = t.format_iso8601 (true, false, true, false);

        BOOST_CHECK_EQUAL("00:00:42", *s);
    }

    BOOST_AUTO_TEST_CASE(FormatISO8601_DT)
    {
        I2n::clock::Time t (1541934671, 0);
        boost::optional<std::string> s = t.format_iso8601 (true, true, true, false);

        BOOST_CHECK_EQUAL("2018-11-11T11:11:11", *s);
    }

    BOOST_AUTO_TEST_CASE(FormatISO8601_DTZ)
    {
        I2n::clock::Time t (1541934671, 0);
        boost::optional<std::string> s = t.format_iso8601 (true, true, true, true);

        BOOST_CHECK_EQUAL("2018-11-11T11:11:11Z+0000", *s);
    }

    BOOST_AUTO_TEST_CASE(Format_make_nice_time)
    {
        I2n::clock::Time t (111111, 0);
        boost::optional<std::string> s = t.make_nice_time ();

        BOOST_CHECK_EQUAL("1 day, 06:51:51", *s);
    }

    BOOST_AUTO_TEST_CASE(Format_format_full_time)
    {
        I2n::clock::Time t (1541934671, 0);
        /*
         * brr, the old formatters use localtime without a way to opt out of
         * it!
         */
        setenv ("TZ", "UTC", 1);
        tzset();
        boost::optional<std::string> s = t.format_full_time ();

        BOOST_CHECK_EQUAL("11.11.2018 11:11", *s);
    }

    BOOST_AUTO_TEST_CASE(Format_format_date)
    {
        I2n::clock::Time t (1541934671, 0);
        boost::optional<std::string> s = t.format_date ();

        BOOST_CHECK_EQUAL("11.11.2018", *s);
    }

BOOST_AUTO_TEST_SUITE_END() /* [Clock] */

BOOST_AUTO_TEST_SUITE_END()