Better XCTest expectations

XCTest+Expectations

extension XCTestCase {
    func fail(expectation: XCTestExpectation?, file: String = __FILE__, line: UInt = __LINE__) {
        expectation?.fulfill()
        
        self.recordFailureWithDescription("Expectation failed: \(expectation)", inFile: file, atLine: line, expected: false)
    }
    
    func fulfill(expectation: XCTestExpectation?, @autoclosure condition: ()->Bool = true, file: String = __FILE__, line: UInt = __LINE__) {
        guard let expectation = expectation else { return }
        
        if condition() {
            expectation.fulfill()
        }
        else {
            fail(expectation, file: file, line: line)
        }
    }
    
}

//Usage:

func test() {
  //weakify expectation to be sure we never fullfill it after timeout
  weak var expectation = expectationWithDescription("some description")
  
  //some async operation with completion block
  
  //weakify self if operation is retianed somehow (maybe not directly) by test case
  doAsync { [weak self] in
    self?.fulfill(expectation, condition: someCondition)
    
    //any additional asserts
  }
  
  waitForExpectationsWithTimeout(5, handler: nil)
}