Lesson 15: marketplace test

[CodeLikeLisa]

Not sure I understand the logic behind this line await basicNft.approve(ethers.constants.AddressZero, TOKEN_ID) in the code below... namely why this "ethers.constants.AddressZero" is necessary or the logic behind it as I would think await basicNft.approve(NftMarketplacecontract.address, TOKEN_ID) would be the way to deal with this

it("needs approvals to list item", async function () {
await basicNft.approve(ethers.constants.AddressZero, TOKEN_ID)
await expect(
nftMarketplace.listItem(basicNft.address, TOKEN_ID, PRICE)
).to.be.revertedWith("NotApprovedForMarketplace")
})

[mattjaf]

From my understanding,

Its to ensure that it gets reverted, if someone tried to list an improperly approved token.

As well as, it bumps up those coverage numbers.

something like:
await basicNft.approve(NftMarketplacecontract.address, TOKEN_ID)
might not revert.