Parking Lot TDD

Problem

• Design a Parking Lot System using Test Driven Developlment (TDD).
• A vehicle to be parked can be either a two-wheeler or a four-wheeler.
• When the vehicle is to be parked, the owner will be provided a ticket.
• If there are no parking slots available, then owner should not be allowed to park.
• When the vehicle is to be unparked, the owner must provide the ticket.
• The parking charges of the two-wheeler & the four-wheeler would be different.

<img width="1000" height="400" alt="image" src="https://user-images.githubusercontent.com/12964174/210460262-888e1289-d949-41d8-870d-4fbb7aa28b29.png">

Thinking Solution

- Functional Requirement
    - Park Vehicles
        - Two / Four
        - Ticket
            - ticketNo
            - slotNo
            - Timestamp
        - Prevent parking when no free slots 
    - Unpark Vehicle
        - Ticket
        - Check for validity
        - Calculate charges
- Solution
    - Class / Modals / Actor
        - Enum Vehicle Types {Two, Four}
        - Vehicle
            - vehicleNo
            - vehicleType/Size
            - ownerName
        - Slot 
            - slotNo
            - isEmpty/isVacant
            - parkedVehicle
            - parkAVehicle()
            - vacateAVehicle()
        - Ticket
            - ticketNo
            - slotNo
            - Timestamp
            - vehicleNo
    - Services / Logical Classes
        - Parking 
            - parkAVehicle()
                - Check for availability
                - Park a vecihle 
                - Generate ticket
            - unParkVehicle()
                - Check wether Vehicle is parked on that slot (Ticket)
                - Calculate charges
                - Return Vehicle & free slot