https://github.com/trilliwon/tddbyexample
Swift TDD: By Example
https://github.com/trilliwon/tddbyexample
Last synced: 7 months ago
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Swift TDD: By Example
- Host: GitHub
- URL: https://github.com/trilliwon/tddbyexample
- Owner: trilliwon
- License: mit
- Created: 2016-06-18T04:04:13.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2018-02-08T07:28:50.000Z (over 7 years ago)
- Last Synced: 2025-03-18T22:57:22.774Z (7 months ago)
- Language: Swift
- Size: 29.3 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# TDDByExample
Swift TDD: By Example
---
### Money.swift
```Swift
import Foundation
protocol Expression {
func reduce(_ bank: Bank, to: String) -> Money
func plus(_ addend: Expression) -> Expression
func times(_ multiplier: Int) -> Expression
}
class Money: Equatable, Expression {
internal var amount: Int
internal var currencyString: String
init(amount: Int, currencyString: String) {
self.amount = amount
self.currencyString = currencyString
}
static func dollar(_ amount: Int) -> Money {
return Money(amount: amount, currencyString: "USD")
}
static func frenc(_ amount: Int) -> Money {
return Money(amount: amount, currencyString: "CHF")
}
func currency() -> String {
return currencyString
}
func times(_ multiplier: Int) -> Expression {
return Money(amount: amount * multiplier, currencyString: currencyString)
}
func plus(_ addend: Expression) -> Expression {
return Sum(augend: self, addend: addend)
}
func reduce(_ bank: Bank, to: String) -> Money {
let rate = bank.rate(currency(), to: to)
return Money(amount: amount / rate, currencyString: to)
}
}
func ==(lhs: Money, rhs: Money) -> Bool {
if lhs.amount != rhs.amount {
return false
}
if lhs.currencyString != rhs.currencyString {
return false
}
return true
}
```
---
### MoneyTests.swift
```Swift
import XCTest
@testable import TDDByExample
class MoneyTests: XCTestCase {
override func setUp() {
super.setUp()
}
override func tearDown() {
super.tearDown()
}
func test_Multiplication() {
let five: Money = Money.dollar(5)
let ten = five.times(2) as! Money
let fifteen = five.times(3) as! Money
XCTAssertEqual(Money.dollar(10), ten)
XCTAssertEqual(Money.dollar(15), fifteen)
}
func test_Currency() {
XCTAssertEqual("USD", Money.dollar(1).currency())
XCTAssertEqual("CHF", Money.frenc(1).currency())
}
func test_Equality() {
XCTAssertTrue((Money.dollar(5) == Money.dollar(5)))
XCTAssertFalse(Money.dollar(5) == Money.dollar(6))
XCTAssertFalse(Money.dollar(5) == Money.frenc(5))
}
func test_SimpleAddition() {
let five = Money.dollar(5)
let sum: Expression = five.plus(five)
let bank = Bank()
let reduced = bank.reduce(sum, to: "USD")
XCTAssertEqual(Money.dollar(10), reduced)
}
func test_PlusReturnsSum() {
let five = Money.dollar(5)
let result = five.plus(five)
let sum: Sum = result as! Sum
let augend = sum.augend as! Money
let addend = sum.addend as! Money
XCTAssertEqual(five, augend)
XCTAssertEqual(five, addend)
}
func test_ReduceSum() {
let sum = Sum(augend: Money.dollar(3), addend: Money.dollar(4))
let bank = Bank()
let result = bank.reduce(sum, to: "USD")
XCTAssertEqual(Money.dollar(7), result)
}
func test_ReduceMoney() {
let bank = Bank()
let result = bank.reduce(Money.dollar(1), to: "USD")
XCTAssertEqual(Money.dollar(1), result)
}
func test_ReduceMoneyDifferentCurrency() {
let bank = Bank()
bank.addRate("CHF", to: "USD", rate: 2)
let result = bank.reduce(Money.frenc(2), to: "USD")
XCTAssertEqual(Money.dollar(1), result)
}
func test_IdentityRate() {
XCTAssertEqual(1, Bank().rate("USD", to: "USD"))
}
func test_MixedAddtion() {
let fiveBucks: Expression = Money.dollar(5)
let tenFrances: Expression = Money.frenc(10)
let bank = Bank()
bank.addRate("CHF", to: "USD", rate: 2)
let result: Money = bank.reduce(fiveBucks.plus(tenFrances), to: "USD")
XCTAssertEqual(Money.dollar(10), result)
}
func test_SumPlusMoney() {
let fiveBucks: Expression = Money.dollar(5)
let tenFrances: Expression = Money.frenc(10)
let bank = Bank()
bank.addRate("CHF", to: "USD", rate: 2)
let sum: Expression = Sum(augend: fiveBucks, addend: tenFrances).plus(fiveBucks)
let result: Money = bank.reduce(sum, to: "USD")
XCTAssertEqual(Money.dollar(15), result)
}
func test_SumTimes() {
let fiveBucks: Expression = Money.dollar(5)
let tenFrances: Expression = Money.frenc(10)
let bank = Bank()
bank.addRate("CHF", to: "USD", rate: 2)
let sum: Expression = Sum(augend: fiveBucks, addend: tenFrances).times(2)
let result: Money = bank.reduce(sum, to: "USD")
XCTAssertEqual(Money.dollar(20), result)
}
}
```