public/subjects/blockchain/decentralized-finance/audit

Exercise 1: Stablecoin

Deploy the oracle smart contract

Call the setEthPrice() function with value 1000 (1 Eth = $ 1000)

Can you trigger the oracle smart contract to set the current price of Ether?

Call the getEthPrice() function

Do you get the provided value as a return from the getEthPrice() function?

Compile and deploy the stablecoin smart contract

Does the smart contract compile and deploy?

Call the registerOracle() function with the address of the oracle smart contract

Call the deposit() function with 1 Ether (in wei)

Call the mint() function with 200 and verify your balance in stablecoin

Have you received the 200 stablecoins?

Call the mint() function with 3000

Does the transaction fail?

Call the withdraw() function with 1 Ether (in wei)

Does the transaction fail?

Call the burn() function with 200

Does you have now 0 stablecoins again?

Mint 500 stablecoins again,

Change the value of ETH in the oracle smart contract to 1

From a second account, deposit 1 Ether, mint 500 stablecoins, and liquidate the position of the first account

Does the liquidation succeed?

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Exercise 2: Lending Platform

Deploy the oracle smart contract

Call the setPrice() function with value 1000 and call the getPrice() function

Can you trigger the oracle smart contract to set the price and retrieve the value correctly?

Compile and deploy the tokens smart contract following the script provided.

Does the smart contracts compile and deploy?

Call the registerOracle() function with the address of the oracle smart contract

Call the depositStable() function with 200 Stable and verify your balance in lStable

Have you received the 200 lStable?

With a second user, call depositVolatile with 2'000

Have you received the 2'000 lVolatile?

Call the borrowStable() function with 200

Does the transaction fail?

Call the borrowStable() function with 20

Did you receive the corresponding Stable amount?

Change the value of Volatile in the oracle smart contract to 10

From a second account and liquidate the position of the first account

Does the liquidation succeed?

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Exercise 3: Tests and Coverage

Install the test tooling recommended in the documentation

run the command provided in the documentation

Does the tests execute correctly?

Does the tests cover all functions?

For each function, are there two tests, one positive and one negative?