codenamerhu / parkingapp

Parking App

Requirements

• Built through XCode 12

simulator build located in "Sumulator App Bundle" folder

asessment's required function/method

Payment.swift

func processPayment(for amountPaying: Double, for amountDeducting: Double) throws -> String {
        ...
    }

processPayment method takes in 2 parameters, amountPaying which is the amount paid to parking and amountDeducting which is the amount to be deducted from the the amount(amountPaying) payed, it then subtracts the numbers and returns the change/remaining amount in ZAR(rands)

Unit Tests

Testing Payment process

func testPayment() throws {
        
        XCTAssertEqual(try sut.processPayment(for: 50, for: 50), "\(0.0) ZAR", "Test passed, R50.0 - R50.0 is R0.0")
        XCTAssertEqual(try sut.processPayment(for: 50, for: 30), "\(20.0) ZAR", "Tessed passed, R50.0 - R30.0 is R20.0")
        XCTAssertThrowsError(try sut.processPayment(for: 0, for: 10)) // test passes, error thrown when amount paying is Zero and bellow
        XCTAssertThrowsError(try sut.processPayment(for: 30, for: 50))// test passes, error thrown when amount paying is less than the amount duducting
    }

Error handling

PaymentError.swift

enum PaymentError: Error {
    case notEnoughFundsError
    case cannotBeZeroError
    case emptyFieldError
    case invalidValue
}

Mock up data - faking data

MockUpData.swift

func fakeParkedHours() ->  Int {
        minutesParked = parkingMinutesArray[Int.random(in: 0..<(parkingMinutesArray.count - 1))]
        let parkingTime = minutesParked / 60
        return parkingTime
    }

An array subscript from parkingMinutesArray[] is chosen at random, this array contains made up minutes at which the fake vehicle has been parked, results from the fakeParkedHours() ia later used in PayForParkingViewControolerto simulate parked time as to allow a demonstraion of paying for the parking

Additional UI App functionality

PayForParkingViewController

Hour/time of parked is chosen at random and app allows user to pay for parking, the purple circle on the upper right of the shows how long the user has been parked

the image above shows the price to be paid for parking

PaymentSuccessViewController