public function testSetGetAggregateResolver()
{
$resolver = new ConcatResolver();
$aggregateResolver = $this->getMock(ResolverInterface::class);
$aggregateResolver->expects($this->once())->method('resolve')->with('say')->will($this->returnValue('world'));
$resolver->setAggregateResolver($aggregateResolver);
$this->assertEquals('world', $resolver->getAggregateResolver()->resolve('say'));
}