Solidity Hardhat – How to Test Sending Ether to a Contract with a Payable Receive Function

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I am writing Hardhat tests for a Solidity contract I've written. The contract contains a receive() external payable { ... } function. How can I call this from a hardhat test with an Ether amount?

Best Answer

You can make a transaction and send ether to the contract address

const [owner] = await ethers.getSigners();

const transactionHash = await owner.sendTransaction({
  to: "contract address",
  value: ethers.utils.parseEther("1.0"), // Sends exactly 1.0 ether
});

Making a transaction should call the receive function.

Related Solutions

Testing with Truffle – How to Send Test Ether on TestRPC

You're submitting an argument called amount, not a payment in Ether.

return projectBeingFunded.fund({from: account, amount:amountToGive});

That would almost be appropriate if the contract function read:

function fund(uint amount) returns(bool) {}

Would actually be:

return projectBeingFunded.fund(amountToGive, {from: account});

But it actually says no arguments are expected, and ETH is expected:

function fund() payable returns (bool) { ...

The unexpected argument is a JUMP. So, try this:

return projectBeingFunded.fund({from: account, value: amountToGive});

Where amountToGive is a uint in Wei and the sender has that much money, as I assume is the case.

Hope it helps.

Solidity Payable – Can Payable Function Only Receive Native Token or Coin of Chain?

Yes, the payable keyword makes the function capable of receiving the blockchain's native asset - such as Eth or BNB. If you try to send the native asset to the contract and there is no payable function to receive it, the transaction will revert.

All other asset types (ERC20 tokens, ERC721, ...) are perhaps, technically, not even assets at all. They are just smart contracts which keep record of who owns how many of that contract's assets - simple ledgers. Various other smart contracts then utilize those (non-)assets in various ways, but all of that functionality has to be explicitly written as contract code.

Same goes for moving the assets: the native asset has a data slot in transactions (value) where it can be natively moved around. All other asset transfers are just transactions to various smart contracts, asking the contracts to change their ledger values.

Best Answer

Related Solutions

Testing with Truffle – How to Send Test Ether on TestRPC

Solidity Payable – Can Payable Function Only Receive Native Token or Coin of Chain?

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