Test ethereum Event Logs with truffle

0 votes

I have a contract's function which emit events on each call.

I would like to have an event emitted on each test which are passing, here are some tests :

it("should emit Error event when sending 5 ether", function(done){
  var insurance = CarInsurance.deployed();

  insurance.send({from: accounts[0], value: web3.toWei(5, 'ether')}).then(done).catch(done);
});

it("should emit Error event when sending 5 ether", function(done){
  var insurance = CarInsurance.deployed();

  insurance.send({from: accounts[0], value: web3.toWei(5, 'ether')}).then(function(txHash){
    assert.notEqual(txHash, null);
  }).then(done).catch(done);
});

it("should emit Error event when sending 5 ether", function(done){
  var insurance = CarInsurance.deployed();

  insurance.send({from: accounts[0], value: web3.toWei(5, 'ether')}).then(function(done){
    done();
  }).catch(done);
});

The results are :

1) should emit Error event when sending 5 ether

Events emitted during test:
---------------------------

Error(error: Must send 10 ether)

---------------------------
✓ should emit Error event when sending 5 ether (11120ms)
✓ should emit Error event when sending 5 ether (16077ms)


3 passing (51s)
1 failing

1) Contract: CarInsurance should emit Error event when sending 5 ether:
 Error: done() invoked with non-Error: 0x87ae32b8d9f8f09dbb5d7b36267370f19d2bda90d3cf7608629cd5ec17658e9b

You can see that the only one which is logged fail.

Sep 21, 2018 in Blockchain by digger
• 26,700 points

retagged Nov 22, 2018 by Priyaj 1,053 views

1 answer to this question.

0 votes

You are passing tx hash into done() function. I think the problem is in line:

insurance.send({from: accounts[0], value: web3.toWei(5, 'ether')}).then(done).catch(done);

Change it to:

insurance.send({from: accounts[0], value: web3.toWei(5, 'ether')}).then(function() { done(); }).catch(done);

To test for events:

it("should check events", function(done) {
  var watcher = contract.Reward();

  // we'll send rewards
  contract.sendReward(1, 10000, {from: accounts[0]}).then(function() {
    return watcher.get();
  }).then(function(events) {
    // now we'll check that the events are correct
    assert.equal(events.length, 1);
    assert.equal(events[0].args.beneficiary.valueOf(), 1);
    assert.equal(events[0].args.value.valueOf(), 10000);
  }).then(done).catch(done);
});
answered Sep 21, 2018 by slayer
• 29,300 points

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