public function testDni()
{
$this->assertTrue(EsValidation::dni('32050031Z'));
$this->assertTrue(EsValidation::dni('03654968S'));
$this->assertTrue(EsValidation::dni('00000014Z'));
$this->assertTrue(EsValidation::dni('14Z'));
$this->assertFalse(EsValidation::dni('145'));
$this->assertFalse(EsValidation::dni('21856874H'));
}