public function eraOf($eraValue)
{
return IsoEra::of($eraValue);
}
public function test_with()
{
$base = Year::of(5);
$result = $base->with(ChronoField::ERA(), 0);
$ad = $base->adjust(IsoEra::of(0));
$this->assertEquals($result, $ad);
$prolepticYear = IsoChronology::INSTANCE()->prolepticYear(IsoEra::of(0), 5);
$this->assertEquals($result->get(ChronoField::ERA()), 0);
$this->assertEquals($result->get(ChronoField::YEAR()), $prolepticYear);
$this->assertEquals($result->get(ChronoField::YEAR_OF_ERA()), 5);
$result = $base->with(ChronoField::YEAR(), 10);
$this->assertEquals($result->get(ChronoField::ERA()), $base->get(ChronoField::ERA()));
$this->assertEquals($result->get(ChronoField::YEAR()), 10);
$this->assertEquals($result->get(ChronoField::YEAR_OF_ERA()), 10);
$result = $base->with(ChronoField::YEAR_OF_ERA(), 20);
$this->assertEquals($result->get(ChronoField::ERA()), $base->get(ChronoField::ERA()));
$this->assertEquals($result->get(ChronoField::YEAR()), 20);
$this->assertEquals($result->get(ChronoField::YEAR_OF_ERA()), 20);
}