【CodeTest】Mocking in Swift

学习资料

• XCTest​Case /
  XCTest​Expectation /
  measure​Block()
• http://ocmock.org/swift/
• How to Create Mocks and Stubs in Swift

Mocking in Swift

在学习Swift单元测试的过程中,发现Quick和Sleipnir均没有提供mock的解决方案,感觉很诧异,难道Swift还这么不成熟么?经过查阅资料,才发现,原来由于Swift的一些新的语言特性(在函数或方法中,可以声明实现类),导致专门为Swift写一套第三方的mock框架已经不再必要.

我们仿照行为驱动开发举例说明中的第一个例子,消息格式化EventDescriptionFormatter写一个测试.

源码:

EventProtocol.swift

import Foundation

public protocol EventProtocol {

   var name     : String {get set}
   var startDate: NSDate {get set}
   var endDate  : NSDate {get set}
    
    
}  

EventDescriptionFormatter.swift

import Foundation

public extension NSDate {

    class func dateFromeString(dateString: String) -> NSDate {
    
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        
        return dateFormatter.dateFromString(dateString)!
    }
    
    func descriptionString() -> String {
    
        let dateFormatter = NSDateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        
        return dateFormatter.stringFromDate(self)
    }
}

public class EventDescriptionFormatter {

    public init() {
    
    }
    
    public func eventDescriptionFromEvent(event : EventProtocol) -> String {
    
        return "\(event.name):开始于\(event.startDate.descriptionString()),结束于\(event.endDate.descriptionString())"
    }
}  

EventDescriptionFormatterSpec.swift

import Quick
import Nimble
import UseQuick

class EventDescriptionFormatterSpec: QuickSpec {
    
    override func spec() {
        
        class MockEvent: EventProtocol {
        
            var name      : String
            var startDate : NSDate
            var endDate   : NSDate
            
            init() {
            
                self.name      = "Fixture Time"
                self.startDate = NSDate.dateFromeString("2015-11-27 09:52:00")
                self.endDate   = NSDate.dateFromeString("2015-11-27 10:52:00")
            }
            
        }
        
        describe("EventDescriptionFormatter") { () -> Void in
            
            var descriptionFormatter : EventDescriptionFormatter!
            let mockEvent = MockEvent()
            
            beforeEach { () -> () in
                
                descriptionFormatter = EventDescriptionFormatter()
            }
            
            context(".eventDescriptionFromEvent") { () -> Void in
                
                it("should describe the event", closure: { () -> () in
                    
                    expect(descriptionFormatter.eventDescriptionFromEvent(mockEvent)).to(equal("Fixture Time:开始于2015-11-27 09:52:00,结束于2015-11-27 10:52:00"))
                })
            }
        }
    }
}  

以上使用了Quick.

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