Hi @abcoathup, thanks for sharing (Simple ERC777 token example), I have an issue with the Recipient Smart Contract.
In tokensReceived( ) function, if I emit events, they are not fired.
Am I missing something ?
1 Like
Hi @maverick193 welcome to the community 
Great question. I suspect you might be checking for an event to be directly emitted, when the event is emitted from the token received contract after being called by the ERC777 token contract.
I updated the example to include an event being fired to show how this works.
function tokensReceived(
address operator,
address from,
address to,
uint256 amount,
bytes calldata userData,
bytes calldata operatorData
) external {
require(msg.sender == address(_token), "Simple777Recipient: Invalid token");
// do stuff
emit DoneStuff(operator, from, to, amount, userData, operatorData);
}
We can test for the event being emitted in the transaction using OpenZeppelin test helpers expectEvent.inTransaction which can test for events indirectly emitted. See the documentation for details.
it('sends to a contract from an externally-owned account', async function () {
const amount = new BN(1000);
const receipt = await this.token.send(this.recipient.address, amount, data, { from: holder });
await expectEvent.inTransaction(receipt.tx, Simple777Recipient, 'DoneStuff', { from: holder, to: this.recipient.address, amount: amount, userData: data, operatorData: null });
const recipientBalance = await this.token.balanceOf(this.recipient.address);
recipientBalance.should.be.bignumber.equal(amount);
});
1 Like
Hi @abcoathup, awesome !! it works !!
Now I understand my mistake, in my test script, I was expecting to catch the event using expectEvent.inLogs (log checking)
With expectEvent.inTransaction, I am able to test the event (indirectly emitted).
Thanks again for your answer and your time !!
1 Like