public function test_rfc1123_basics()
 {
     $this->assertEquals(DateTimeFormatter::RFC_1123_DATE_TIME()->getChronology(), IsoChronology::INSTANCE());
     $this->assertEquals(DateTimeFormatter::RFC_1123_DATE_TIME()->getZone(), null);
     $this->assertEquals(DateTimeFormatter::RFC_1123_DATE_TIME()->getResolverStyle(), ResolverStyle::SMART());
 }