NSRunLoop always throw NSInvalidArgumentException

I'm using NSRunLoop to test asynchronous function in unittest, something like

__block done = NO;
[networkManager POST:url parameters:nil block:^(AFHTTPRequestOperation *operation, id responseObject){
    done = YES;
}]

while(!done) {
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
XCTAssert(...)

But NSRunLoop always throw below exception, How to resolve it?

caught "NSInvalidArgumentException", "-[NSRecursiveLock objecID]": unrecognized selector sent to instance ....