如何使用“安全帽”检测另一项合同中的排放？

Question

我正试图从expectEvent.inTransaction()中复制@openzeppelin/test-helpers中的“硬帽子”。

场景：token正在从owner转移到receiverContract。我想检查receiverContract是否发出了一个Received事件。

事务如下所示，由所有者发起。

const tx = await token.transferFrom(
  owner.address, // <- From this wallet
  receiverContract.address, // <- To this contract
  tokenId,
  {
    from: owner.address,
  }
);

此测试可以显示发出Transfer事件的令牌。

await expect(tx)
  .to.emit(this.token, "Transfer")
  .withArgs(owner.address, receiverContract.address, tokenId);

但我想写这样的东西..。

await expect(tx) // <- Not sure what to put here
  .to.emit(receiverContract, "Received") // <- This may also be off
  .withArgs(token, owner.address, tokenId, null);

或者，我可以查看接收者的收据对象，但我也不知道如何得到.通常是通过..。

const tx = await token.transferFrom(owner.address, receiverContract.address, tokenId, {from: owner.address});
const receipt = await tx.wait();
console.log("receipt", receipt); // <- This will show an events array 
// which I can check. But how do I get this same receipt object for
// the receiverContract

Answer 1

每个合同都可以通过console.log(receiverContract)查看.因此，我最终导航到合同中的event对象。这是合同记录的片段.

{
  interface: Interface {
    fragments: [ [ConstructorFragment], [EventFragment], [FunctionFragment] ],
    _abiCoder: AbiCoder { coerceFunc: null },
    functions: {
      'onERC721Received(address,address,uint256,bytes)': [FunctionFragment]
    },
    errors: {},
    events: { // <- This is what we're looking for
      'Received(address,address,uint256,bytes,uint256)': [EventFragment {
    name: 'Received',
    anonymous: false,
    inputs: [ [ParamType], [ParamType], [ParamType], [ParamType], [ParamType] ],
    type: 'event',
    _isFragment: true
  }],
  // ...
}

运行console.log(receiverContract.interface.events)将为您提供以下嵌套对象

  'Received(address,address,uint256,bytes,uint256)',
  EventFragment {
    name: 'Received', // <- This is the event name
    anonymous: false,
    inputs: [ [ParamType], [ParamType], [ParamType], [ParamType], [ParamType] ],
    type: 'event',
    _isFragment: true
  }

因此，为了查找和测试所发出的事件，这是可行的。

expect(
  Object.entries(receiverContract.interface.events).some(
    ([k, v]: any) => v.name === "Received"
  )
).to.be.equal(true);