ios – XCTest:测试没有完成块的异步函数

我想测试一个调用异步任务的函数(异步调用webservice):

+(void)loadAndUpdateConnectionPool{

  //Load the File from Server
  [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *responseCode, NSData *responseData, NSError *error) {
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)responseCode;
    if([httpResponse statusCode] != 200){
        // Show Error 
    }else{
        // Save Data
        // Post Notification to View
    }
  }];

}

由于函数没有完成处理程序,如何在我的XCTest类中测试它:

-(void)testLoadConnectionPool {

  [ConnectionPool loadAndUpdateConnectionPool];

  // no completion handler, how to test?
  XCTAssertNotNil([ConnectionPool savedData]);

}

有没有最好的做法,比如超时或其他什么? (我知道如果不重新设计loadAndUpdateConnectionPool函数,我就无法使用dispatch_sempaphore).

最佳答案 您在完成时发布通知(也发布有关错误的通知),因此您可以为该通知添加期望.

- (void)testLoadConnectionPool {
    // We want to wait for this notification
    self.expectation = [self expectationForNotification:@"TheNotification" object:self handler:^BOOL(NSNotification * _Nonnull notification) {
        // Notification was posted
        XCTAssertNotNil([ConnectionPool savedData]);
    }];

    [ConnectionPool loadAndUpdateConnectionPool];

    // Wait for the notification. Test will fail if notification isn't called in 3 seconds
    [self waitForExpectationsWithTimeout:3 handler:nil];
}
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