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December 16, 2018 12:49
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SwiftCheck ( https://github.com/typelift/SwiftCheck )
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// MARK: Date + SwiftCheck | |
extension Date: RandomType { | |
public static func randomInRange<G : RandomGeneneratorType>(_ range : (Date, Date), gen : G) -> (Date, G) { | |
let (min, max) = range | |
let (t, gen2) = Double.randomInRange((min.timeIntervalSince1970, max.timeIntervalSince1970), gen: gen) | |
return (Date(timeIntervalSince1970: t), gen2) | |
} | |
} | |
extension Date: Arbitrary { | |
public static var arbitrary: SwiftCheck.Gen<Date> { | |
return Gen.fromElements(in: Date(timeIntervalSince1970: 0)...Date(timeIntervalSince1970: TimeInterval(Int32.max))) | |
} | |
/// - See Also: `SwiftCheck.Double.shrink` | |
/// - https://github.com/typelift/SwiftCheck/blob/794a986232e70bebe008e776a7e181d766aee254/Sources/SwiftCheck/Arbitrary.swift#L266-L293 | |
public static func shrink(_ date: | |
let double = date.timeIntervalSince1970 | |
let tail = Int64(double).shrinkIntegral.map { Date(timeIntervalSince1970: Double($0)) } | |
if double.sign == .minus { | |
return [Date(timeIntervalSince1970: Swift.abs(double))] + tail | |
} | |
return tail | |
} | |
} |
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