public function testCloneIsDeep()
 {
     $r = new Request('GET', '/test', ['foo' => 'baz'], Stream::factory('foo'));
     $r2 = clone $r;
     $this->assertNotSame($r->getEmitter(), $r2->getEmitter());
     $this->assertEquals('foo', $r2->getBody());
     $r->getConfig()->set('test', 123);
     $this->assertFalse($r2->getConfig()->hasKey('test'));
     $r->setPath('/abc');
     $this->assertEquals('/test', $r2->getPath());
 }