Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Sample code for my blog post Reflection and Mirror in Swift http://www.vadimbulavin.com/2018-03-09-reflection-and-mirror-in-swift/
import Foundation
import XCTest
protocol AutoEquatable: Equatable {}
extension AutoEquatable {
static func ==(lhs: Self, rhs: Self) -> Bool {
var lhsDump = String()
dump(lhs, to: &lhsDump)
var rhsDump = String()
dump(rhs, to: &rhsDump)
return rhsDump == lhsDump
}
}
protocol AutoHashable: Hashable {}
extension AutoHashable {
var hashValue: Int {
var buf = String()
dump(self, to: &buf)
return buf.hashValue
}
}
struct Order {
let uid: UUID
let count: Int
let orderedAt: Date
let item: Item
}
struct Item {
let uid: UUID
let title: String
let description: String?
let priceUSD: Double
}
struct Person {
let name: String
}
extension Order: AutoEquatable {}
extension Person: AutoEquatable {}
class AutoEquatableTests: XCTestCase {
let coffee = Item(uid: UUID(), title: "Coffee", description: "Nescafe Original", priceUSD: 5)
lazy var twoCoffees: Order = { Order(uid: UUID(), count: 2, orderedAt: Date(), item: coffee) }()
func test_isEqual_samePersons_areEqual()
{
XCTAssertEqual(Person(name: "name"), Person(name: "name"))
}
func test_notEqual_personsWithDifferentNames_areNotEqual()
{
XCTAssertNotEqual(Person(name: "name"), Person(name: "anotherName"))
}
func test_isEqual_sameOrders_areEqual()
{
XCTAssertEqual(twoCoffees, twoCoffees)
}
func test_notEqual_differentOrders_areNotEqual()
{
let sandwich = Item(uid: UUID(), title: "Sandwich", description: nil, priceUSD: 5)
let oneSandwich = Order(uid: UUID(), count: 1, orderedAt: Date(), item: sandwich)
XCTAssertNotEqual(twoCoffees, oneSandwich)
}
}
extension Order: AutoHashable {}
extension Person: AutoHashable {}
class AutoHashableTests: XCTestCase {
let coffee = Item(uid: UUID(), title: "Coffee", description: "Nescafe Original", priceUSD: 5)
lazy var twoCoffees: Order = { Order(uid: UUID(), count: 2, orderedAt: Date(), item: coffee) }()
func test_hashValue_personsWithEqualNames_haveEqualHash()
{
XCTAssertEqual(Person(name: "name").hashValue, Person(name: "name").hashValue)
}
func test_hashValue_personsWithDifferentNames_haveDifferentHash()
{
XCTAssertNotEqual(Person(name: "name").hashValue, Person(name: "anotherName").hashValue)
}
func test_hashValue_personsWithEqualNames_replacedInSet()
{
var set = Set<Person>()
set.insert(Person(name: "name"))
set.insert(Person(name: "name"))
XCTAssertEqual(set.count, 1)
}
func test_hashValue_personsWithDifferentNames_notReplacedInSet()
{
var set = Set<Person>()
set.insert(Person(name: "name"))
set.insert(Person(name: "anotherName"))
XCTAssertEqual(set.count, 2)
}
func test_hashValue_sameOrders_haveEqualHash()
{
XCTAssertEqual(twoCoffees.hashValue, twoCoffees.hashValue)
}
func test_hashValue_differentOrders_haveDifferentHash()
{
let sandwich = Item(uid: UUID(), title: "Sandwich", description: nil, priceUSD: 5)
let oneSandwich = Order(uid: UUID(), count: 1, orderedAt: Date(), item: sandwich)
XCTAssertNotEqual(twoCoffees.hashValue, oneSandwich.hashValue)
}
}
AutoEquatableTests.defaultTestSuite.run()
AutoHashableTests.defaultTestSuite.run()
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.