Date+Stubbing.swift

/**
*  Plot
*  Copyright (c) John Sundell 2019
*  MIT license, see LICENSE file for details
*/

import XCTest

extension Date {
    enum FormattingStyle {
        case rss
        case siteMap
    }

    typealias Stubs = (date: Date, timeZone: TimeZone, expectedString: String)

    static func makeStubs(withFormattingStyle formattingStyle: FormattingStyle) throws -> Stubs {
        let timeZone = try require(TimeZone(secondsFromGMT: 60 * 60))

        var dateComponents = DateComponents()
        dateComponents.calendar = Calendar(identifier: .gregorian)
        dateComponents.timeZone = timeZone
        dateComponents.day = 17
        dateComponents.month = 10
        dateComponents.year = 2019
        dateComponents.hour = 10
        dateComponents.minute = 15
        dateComponents.second = 5

        let date = try require(dateComponents.date)

        return (
            date,
            timeZone,
            formattingStyle.expectedString
        )
    }
}

private extension Date.FormattingStyle {
    var expectedString: String {
        switch self {
        case .rss:
            return "Thu, 17 Oct 2019 10:15:05 +0100"
        case .siteMap:
            return "2019-10-17"
        }
    }
}