Testing asynchronous block of code

suggest change

- (void)testDoSomethingThatTakesSomeTime{
XCTestExpectation *completionExpectation = [self expectationWithDescription:@"Long method"];
[self.someObject doSomethingThatTakesSomeTimesWithCompletionBlock:^(NSString *result) {
    XCTAssertEqualObjects(@"result", result, @"Result was not correct!");
    [completionExpectation fulfill];
}];
[self waitForExpectationsWithTimeout:5.0 handler:nil];
}

Feed the dummy data to the method under test if required.
The test will pause here, running the run loop, until the timeout is hit or all expectations are fulfilled.
Timeout is the expected time for the asynchronous block to response.

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