web3.js/test/contract.js

var chai = require('chai');
var assert = chai.assert;
var web3 = require('../index');
var FakeHttpProvider = require('./helpers/FakeHttpProvider');
var utils = require('../lib/utils/utils');

var desc = [{
    "name": "balance(address)",
    "type": "function",
    "inputs": [{
        "name": "who",
        "type": "address"
    }],
    "constant": true,
    "outputs": [{
        "name": "value",
        "type": "uint256"
    }]
}, {
    "name": "send(address,uint256)",
    "type": "function",
    "inputs": [{
        "name": "to",
        "type": "address"
    }, {
        "name": "value",
        "type": "uint256"
    }],
    "outputs": []
}, {
    "name":"Changed",
    "type":"event",
    "inputs": [
        {"name":"from","type":"address","indexed":true},
        {"name":"amount","type":"uint256","indexed":true},
    ],
}];

var address = '0x1234567890123456789012345678901234567890';

describe('web3.eth.contract', function () {
    describe('event', function () {
        it('should probably create event filter', function (done) {
            var provider = new FakeHttpProvider();
            web3.setProvider(provider);
            web3.reset(); // reset different polls
            var sha3 = '0x5131231231231231231231';
            provider.injectResult(sha3);
            var step = 0;
            provider.injectValidation(function (payload) {
                if (step === 0) {
                    step = 1;
                    assert.equal(payload.jsonrpc, '2.0');
                    assert.equal(payload.method, 'web3_sha3');
                    assert.equal(payload.params[0], web3.fromAscii('Changed(address,uint256)'));
                } else if (step === 1) {
                    step = 2;
                    provider.injectResult(3);
                    assert.equal(payload.jsonrpc, '2.0');
                    assert.equal(payload.method, 'eth_newFilter');
                    assert.deepEqual(payload.params[0], {
                        topics: [
                            sha3,
                            '0x1234567890123456789012345678901234567890'
                        ],
                        address: '0x1234567890123456789012345678901234567890'
                    });
                } else if (step === 2 && utils.isArray(payload)) {
                    provider.injectBatchResults([[{
                        address: address,
                        topics: [
                            sha3,
                            '0x0000000000000000000000001234567890123456789012345678901234567890',
                            '0x0000000000000000000000000000000000000000000000000000000000000001'
                        ],
                        number: 2
                    }]]);
                    var r = payload.filter(function (p) {
                        return p.jsonrpc === '2.0' && p.method === 'eth_getFilterChanges' && p.params[0] === 3;
                    });
                    assert.equal(r.length > 0, true);
                }
            });

            var Contract = web3.eth.contract(desc);
            var contract = new Contract(address);

            contract.Changed({from: address}).watch(function(err, result) {
                assert.equal(result.args.from, address); 
                assert.equal(result.args.amount, 1);
                done();
            });
        });
    });
});