问题
Sorry for the noob question, but I'm trying to test a connection, but I'm not able do verify the return of the request, because the test ends before the completion handler have a chance to execute. To ilustrate:
-(void)testConnection
{
[[Conector sharedInstance] performAsynchronousRequestWithServerRequest:_srvRequest completionHandler:^(RequestAsynchronousStatus finishStatus, NSData *data) {
if (finishStatus == RequestAsynchronousOK){
_data = data;
NSLog(@"Data OK");
}
}];
XCTAssertNotNil(_data, @"Data was nil");
}
When I try to assert, _data will always be nil, because the completion handler wasn't executed yet. There is a mechanism to force the test to wait until I have some response from the sendAsynchronousRequest: method. Thanks in advance.
回答1:
This looks like exactly what you need:
XCAsyncTestCase: Asynchronous capable SenTestCase subclass.
Basically, you should write your test like this:
- (void)testConnection
{
[[Conector sharedInstance] performAsynchronousRequestWithServerRequest:_srvRequest completionHandler:^(RequestAsynchronousStatus finishStatus, NSData *data) {
if (finishStatus == RequestAsynchronousOK)
{
_data = data;
[self notify:XCTAsyncTestCaseStatusSucceeded];
NSLog(@"Data OK");
}
}];
[self waitForTimeout:10];
XCTAssertNotNil(_data, @"Data was nil");
}
Notice the waitForTimeout:
call and the notify:
calls. 10 seconds should be enough for the test, though it would depend on the request itself.
You could even get more specific and wait for a certain status, like so:
[self waitForStatus: XCTAsyncTestCaseStatusSucceeded timeout:10];
This way, if the connection fails to notify the XCTAsyncTestCaseStatusSucceeded
status, the wait call will timeout and your test would fail (as it should).
回答2:
Here's another alternative, XCAsyncTestCase based upon the GHUnit version:
https://github.com/iheartradio/xctest-additions
Usage is the same, just import and subclass XCAsyncTestCase.
@implementation TestAsync
- (void)testBlockSample
{
[self prepare];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(){
sleep(1.0);
[self notify:kXCTUnitWaitStatusSuccess];
});
// Will wait for 2 seconds before expecting the test to have status success
// Potential statuses are:
// kXCTUnitWaitStatusUnknown, initial status
// kXCTUnitWaitStatusSuccess, indicates a successful callback
// kXCTUnitWaitStatusFailure, indicates a failed callback, e.g login operation failed
// kXCTUnitWaitStatusCancelled, indicates the operation was cancelled
[self waitForStatus:kXCTUnitWaitStatusSuccess timeout:2.0];
}
回答3:
This is now included in XCode 6:
Obj-C example here:
XCTest and asynchronous testing in Xcode 6
来源:https://stackoverflow.com/questions/19125789/how-to-test-a-sendasynchronousrequest-on-xctest