public function testContains()
{
$interval = TimeInterval::fromString('08:00', '18:30');
$this->assertTrue($interval->contains(new Time('08', '00')));
$this->assertTrue($interval->contains(new Time('18', '30')));
$this->assertTrue($interval->contains(new Time('09', '00')));
$this->assertFalse($interval->contains(new Time('07', '59')));
$this->assertFalse($interval->contains(new Time('18', '31')));
}