node-redis/test/commands/watch.spec.js

'use strict';

var assert = require('assert');
var config = require('../lib/config');
var helper = require('../helper');
var redis = config.redis;

describe("The 'watch' method", function () {

    helper.allTests(function (parser, ip, args) {

        var watched = 'foobar';

        describe('using ' + parser + ' and ' + ip, function () {
            var client;

            beforeEach(function (done) {
                client = redis.createClient.apply(null, args);
                client.once('ready', function () {
                    client.flushdb(done);
                });
            });

            afterEach(function () {
                client.end(true);
            });

            it('does not execute transaction if watched key was modified prior to execution', function (done) {
                client.WATCH(watched);
                client.incr(watched);
                var multi = client.multi();
                multi.incr(watched);
                multi.exec(helper.isNull(done));
            });

            it('successfully modifies other keys independently of transaction', function (done) {
                client.set('unwatched', 200);

                client.set(watched, 0);
                client.watch(watched);
                client.incr(watched);

                client.multi().incr(watched).exec(function (err, replies) {
                    assert.strictEqual(replies, null, 'Aborted transaction multi-bulk reply should be null.');

                    client.get('unwatched', function (err, reply) {
                        assert.equal(reply, 200, 'Expected 200, got ' + reply);
                        return done(err);
                    });
                });
            });
        });
    });
});