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

'use strict';

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

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

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

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

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

            it('pops value immediately if list contains values', function (done) {
                bclient = redis.createClient.apply(null, args);
                redis.debug_mode = true;
                var text = '';
                var unhookIntercept = intercept(function (data) {
                    text += data;
                    return '';
                });
                client.rpush('blocking list', 'initial value', helper.isNumber(1));
                unhookIntercept();
                assert(/^Send 127\.0\.0\.1:6379 id [0-9]+: \*3\r\n\$5\r\nrpush\r\n\$13\r\nblocking list\r\n\$13\r\ninitial value\r\n\n$/.test(text));
                redis.debug_mode = false;
                bclient.blpop('blocking list', 0, function (err, value) {
                    assert.strictEqual(value[0], 'blocking list');
                    assert.strictEqual(value[1], 'initial value');
                    return done(err);
                });
            });

            it('pops value immediately if list contains values using array notation', function (done) {
                bclient = redis.createClient.apply(null, args);
                client.rpush(['blocking list', 'initial value'], helper.isNumber(1));
                bclient.blpop(['blocking list', 0], function (err, value) {
                    assert.strictEqual(value[0], 'blocking list');
                    assert.strictEqual(value[1], 'initial value');
                    return done(err);
                });
            });

            it('waits for value if list is not yet populated', function (done) {
                bclient = redis.createClient.apply(null, args);
                bclient.blpop('blocking list 2', 5, function (err, value) {
                    assert.strictEqual(value[0], 'blocking list 2');
                    assert.strictEqual(value[1], 'initial value');
                    return done(err);
                });
                client.rpush('blocking list 2', 'initial value', helper.isNumber(1));
            });

            it('times out after specified time', function (done) {
                bclient = redis.createClient.apply(null, args);
                bclient.BLPOP('blocking list', 1, function (err, res) {
                    assert.strictEqual(res, null);
                    return done(err);
                });
            });

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