我有一个类,它是NSOperationQueue
. 它允许使用块将网络请求排入队列。当前请求是一个接一个地执行,但是将来可以更改。
这是 MyRequestsQueue 类的代码:
@interface MyRequestsQueue ()
@property(nonatomic, strong) NSOperationQueue* queue;
@end
@implementation MyRequestsQueue
-(instancetype)init
{
self = [super init];
if(!self) {
return nil;
}
self.queue = [[NSOperationQueue new] autorelease];
self.queue.maxConcurrentOperationCount = 1;
return self;
}
-(void)addRequestBlock:(void (^)())request
{
NSBlockOperation* operation = [NSBlockOperation blockOperationWithBlock:request];
[self.queue addOperation:operation];
}
@end
一般来说,我知道如何使用 XCTest 对异步代码进行单元测试。但是现在我想添加一个单元测试来MyRequestsQueue
检查队列当时是否只执行一个操作。甚至更好 - 测试当前执行的操作数不大于maxConcurrentOperationCount
. 我试图观察operationCount
的属性self.queue
,但文档说我不应该依赖它。我怎样才能实现它?
编辑:我的测试使用以下模式:
@interface MessageRequestQueueTest : XCTestCase
@property(nonatomic, strong) MessageRequestsQueue* reuqestQueue;
@property(nonatomic, assign) NSInteger finishedRequestsCounter;
@end
// setUp method ommited - simply initializes self.requestQueue
-(void)testAddedRequestIsExecuted
{
[self.reuqestQueue.queue setSuspended:YES];
__weak __typeof(self) weakSelf = self;
[self.reuqestQueue addRequestBlock:^{
++weakSelf.finishedRequestsCounter;
} withName:kDummyRequestName];
[self.reuqestQueue.queue setSuspended:NO];
WAIT_WHILE(0 == self.finishedRequestsCounter, 0.1);
XCTAssertEqual(self.finishedRequestsCounter, 1, @"request should be executed");
}
WAIT_WHILE 宏来自AGAsyncTestHelper。