public function test_extend()
{
$r1 = new ValidationResult();
$r2 = new ValidationResult();
$r3 = new ValidationResult();
$e1 = new ValidationError('foo', 'bar', new StringConstraint());
$e2 = new ValidationError('bar', 'foo', new StringConstraint());
$e3 = new ValidationError('baz', 'bar', new StringConstraint());
$r1->addErrors([$e1, $e2]);
$r2->addError($e2);
$r3->addError($e3);
$this->assertEquals([$e1, $e2], $r1->getErrors());
$r1->extend($r2);
$this->assertEquals([$e1, $e2, $e2], $r1->getErrors());
$r1->extend($r3);
$this->assertEquals([$e1, $e2, $e2, $e3], $r1->getErrors());
}
