/**
  * @covers phpDocumentor\Descriptor\NamespaceDescriptor::__construct
  * @covers phpDocumentor\Descriptor\NamespaceDescriptor::getClasses
  * @covers phpDocumentor\Descriptor\NamespaceDescriptor::setClasses
  */
 public function testSetAndGetClasses()
 {
     $collection = new Collection();
     $this->assertInstanceOf('phpDocumentor\\Descriptor\\Collection', $this->fixture->getClasses());
     $this->fixture->setClasses($collection);
     $this->assertSame($collection, $this->fixture->getClasses());
 }