Neos\Flow\Aop\Builder\ClassNameIndex::applyIntersect PHP Method

    public function applyIntersect(ClassNameIndex $classNameIndex)
    {
        $this->classNames = array_intersect_key($this->classNames, $classNameIndex->classNames);
    }

 /**
  * @test
  */
 public function applyIntersectWorks()
 {
     $index1 = new Aop\Builder\ClassNameIndex();
     $index1->setClassNames(['\\Foo\\Bar', '\\Foo\\Baz']);
     $index2 = new Aop\Builder\ClassNameIndex();
     $index2->setClassNames(['\\Foo\\Baz', '\\Foo\\Blubb']);
     $index1->applyIntersect($index2);
     $this->assertEquals(['\\Foo\\Baz'], $index1->getClassNames());
 }