public function testWithersReturnNewModifiedInstance()
{
$resolver = new UniqueValueResolver(new UniqueValuesPool());
$newResolver = $resolver->withValueResolver(new FakeValueResolver());
$this->assertEquals(new UniqueValueResolver(new UniqueValuesPool()), $resolver);
$this->assertEquals(new UniqueValueResolver(new UniqueValuesPool(), new FakeValueResolver()), $newResolver);
}