For details see: http://mr-v.github.io/http-testing-in-swift-with-nocilla/

NocillaTestCase.swift

//
//  NocillaTestCase.swift
//
//  Copyright (c) 2014 Witold Skibniewski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import UIKit
import XCTest

class NocillaTestCase: XCTestCase {

    var expectation: XCTestExpectation!

    override class func setUp() {
        super.setUp()
        LSNocilla.sharedInstance().start()
    }

    override class func tearDown() {
        super.tearDown()
        LSNocilla.sharedInstance().stop()
    }

    override func setUp() {
        super.setUp()
        expectation = expectationWithDescription("")
    }

    override func tearDown() {
        super.tearDown()
        expectation = nil
        LSNocilla.sharedInstance().clearStubs()
    }
}