Created
March 11, 2018 10:03
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Minimal Cake Pattern
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import Foundation | |
// See also: https://qiita.com/pab_tech/items/1c0bdbc8a61949891f1f | |
protocol Clock { | |
var now: Date { get } | |
} | |
struct SystemClock: Clock { | |
let now: Date = Date() | |
} | |
/// Uses | |
protocol UsesClock { | |
var clock: Clock { get } | |
} | |
/// MixIn | |
protocol MixInClock: UsesClock {} | |
extension MixInClock { | |
var clock: Clock { return SystemClock() } | |
} | |
/// Service | |
protocol ClockService: UsesClock {} | |
/// Production | |
struct SystemClockService: ClockService, MixInClock { | |
static let shared = SystemClockService() | |
private init () {} | |
} | |
/// Test | |
protocol MockMixInClock: UsesClock {} | |
extension MockMixInClock { | |
var clock: Clock { return MockClock() } | |
} | |
struct MockClock: Clock { | |
var now: Date { return Date(timeIntervalSince1970: 0) } | |
} | |
struct MockClockService: ClockService, MockMixInClock { | |
static let shared = MockClockService() | |
private init () {} | |
} | |
/// Run | |
func printDate(service: ClockService) { | |
print(service.clock.now) | |
} | |
printDate(service: SystemClockService.shared) | |
printDate(service: MockClockService.shared) |
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