public function testParseWithTestValueSet()
 {
     $notNow = IntlCarbon::yesterday();
     IntlCarbon::setTestNow($notNow);
     $this->assertEquals($notNow, IntlCarbon::parse());
     $this->assertEquals($notNow, IntlCarbon::parse(null));
     $this->assertEquals($notNow, IntlCarbon::parse(''));
     $this->assertEquals($notNow, IntlCarbon::parse('now'));
 }
 public function testYesterdayWithTimezone()
 {
     $dt = IntlCarbon::yesterday('Europe/London');
     $dt2 = new \DateTime('yesterday', new \DateTimeZone('Europe/London'));
     $this->assertSame($dt2->format('Y-m-d 00:00:00'), $dt->toDateTimeString());
 }