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Sample of Swift property wrappers for unit testing
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import UIKit | |
@propertyWrapper | |
struct Printer<T> { | |
public var currentValue: T? | |
var wrappedValue: T? { | |
get { | |
print("Property wrapper value printed", currentValue) | |
return currentValue | |
} | |
set { | |
currentValue = newValue | |
} | |
} | |
} | |
protocol StorageProtocol: class { | |
var name: String? { get set } | |
var surname: String? { get set } | |
} | |
class Storage: StorageProtocol { | |
@Printer var name: String? | |
@Printer var surname: String? | |
} | |
class StorageMock: StorageProtocol { | |
var name: String? | |
var surname: String? | |
} | |
class StorageMockOverride: Storage { | |
var _name: String? | |
var _surname: String? | |
override var name: String? { | |
get { | |
return _name | |
} | |
set { | |
_name = newValue | |
} | |
} | |
override var surname: String? { | |
get { | |
return _surname | |
} | |
set { | |
_surname = newValue | |
} | |
} | |
} | |
let storage: StorageProtocol = Storage() | |
storage.name = "Printable Name" | |
storage.surname = "Printable Surname" | |
let storageMock: StorageProtocol = StorageMock() | |
storageMock.name = "Protocol mock name" | |
storageMock.surname = "Protocol mock surname" | |
let storageMockUsingOverride: StorageProtocol = StorageMockOverride() | |
storageMockUsingOverride.name = "Overriden name" | |
storageMockUsingOverride.surname = "Overriden surname" | |
print("Printer sample:", storage.name, storage.surname) | |
print("Printer mock protocol sample:", storageMock.name, storageMock.surname) | |
print("Printer mock override sample:", storageMockUsingOverride.name, storageMockUsingOverride.surname) | |
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