Pet Park

Goal

The goal of this exercise is to develop a pet park smart contract. The basic structure of this contract has been laid out for you in src/PetPark.sol. We can have 5 kinds of animals in our pet park

• Fish (AnimalType: 1)
• Cat (AnimalType: 2)
• Dog (AnimalType: 3)
• Rabbit (AnimalType: 4)
• Parrot (AnimalType: 5)

To install foundry refer to the document here.

This assignment is divided into two parts. In Part A of the assignment you need to write the unimplemented PetPark contract. In Part B of the assignment we have a few incomplete tests you need to complete in test/PetPark.t.sol.

Part A

Complete this contract with following specifications for each function

• add

  • Takes Animal Type and Count. Gives shelter to animals in our park.
  • Only contract owner (address deploying the contract) should have access to this functionality.
  • Emit event Added with parameters Animal Type and Animal Count.

• borrow

  • Takes Age, Gender and Animal Type.
  • Can borrow only one animal at a time. Use function giveBackAnimal to borrow another animal.
  • Men can borrow only Dog and Fish.
  • Women can borrow every kind, but women aged under 40 are not allowed to borrow a Cat.
  • Throw an error if an address has called this function before using other values for Gender and Age.
  • Emit event Borrowed with parameter Animal Type.

• giveBackAnimal

  • Throw an error if user hasn't borrowed before.
  • Emit event Returned with parameter Animal Type.

Part B

Complete the following tests in test/PetPark.t.sol

• testCannotAddAnimalWhenNonOwner

  • Test that any non-owner account cannot add animals using the add function

• testCannotBorrowWhenAgeZero

  • Test that the borrow function fails when called with an age equal to 0.

• testBorrowCountDecrement

  • Test that the count of animal decreases correctly when the borrow function is called.

Evaluation

• Create a fork of this repo

• Clone the forked repo. Use the flag --recurse-submodules to clone the forked repo along with the submodules. You can use the following command after replacing the CLONE_URL with the clone url of your repo

  git clone --recurse-submodules CLONE_URL
  

• Go to your forked repo and under Actions make sure that github actions on forked repo are enabled.

• Install forge-std library using the below command

  forge install foundry-rs/forge-std --no-commit
  

• Make changes to the src/PetPark.sol file. The tests in test/PetPark.t.sol should run successfully.

• Run Tests

  forge test
  

• Push your changes to main branch of your forked repo to trigger the github workflow that runs these tests.

• Submit your name, email and link to your forked repo here.

Note

• The error strings (mentioned in revert statement) must be same as the ones mentioned in tests.
• Use modifiers, structs where appropriate.

Reference

• Foundry Book