UniqueEntityValidator example

$classMetadata->reflFields = ['name' => $refl];
        $em->expects($this->any())
            ->method('getClassMetadata')
            ->willReturn($classMetadata)
        ;

        return $em;
    }

    protected function createValidator(): UniqueEntityValidator
    {
        return new UniqueEntityValidator($this->registry);
    }

    private function createSchema($em)
    {
        $schemaTool = new SchemaTool($em);
        $schemaTool->createSchema([
            $em->getClassMetadata(SingleIntIdEntity::class),
            $em->getClassMetadata(SingleIntIdNoToStringEntity::class),
            $em->getClassMetadata(DoubleNameEntity::class),
            $em->getClassMetadata(DoubleNullableNameEntity::class),
            $em->getClassMetadata(CompositeIntIdEntity::class),