function testObject()
{
$this->assert(Argument::object(\DateTime::class)->accepts(new ExactArgument(new \DateTime())));
$this->assert(Argument::object(\DateTime::class)->accepts(new ObjectArgument(\DateTime::class)));
$this->assert(Argument::object(\DateTimeInterface::class)->accepts(new ObjectArgument(\DateTime::class)));
$this->assert->not(Argument::object(\DateTime::class)->accepts(new ObjectArgument(\DateTimeInterface::class)));
}