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

'use strict';

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

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

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

        describe('using ' + parser + ' and ' + ip, function () {
            var key = 'sequence';

            describe('when not connected', function () {
                var client;

                beforeEach(function (done) {
                    client = redis.createClient.apply(null, args);
                    client.once('ready', function () {
                        client.set(key, '9007199254740992', function (err, res) {
                            helper.isNotError()(err, res);
                            client.quit();
                        });
                    });
                    client.on('end', done);
                });

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

                it('reports an error', function (done) {
                    client.incr(function (err, res) {
                        assert(err.message.match(/The connection has already been closed/));
                        done();
                    });
                });
            });

            describe('when connected and a value in Redis', function () {
                var client;

                before(function (done) {
                    /*
                        9007199254740992 -> 9007199254740992
                        9007199254740993 -> 9007199254740992
                        9007199254740994 -> 9007199254740994
                        9007199254740995 -> 9007199254740996
                        9007199254740996 -> 9007199254740996
                        9007199254740997 -> 9007199254740996
                    */
                    client = redis.createClient.apply(null, args);
                    client.once('error', done);
                    client.once('ready', function () {
                        client.set(key, '9007199254740992', function (err, res) {
                            helper.isNotError()(err, res);
                            done();
                        });
                    });
                });

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

                it('changes the last digit from 2 to 3', function (done) {
                    client.INCR(key, function (err, res) {
                        helper.isString('9007199254740993')(err, res);
                        done(err);
                    });
                });

                describe('and we call it again', function () {
                    it('changes the last digit from 3 to 4', function (done) {
                        client.incr(key, function (err, res) {
                            helper.isString('9007199254740994')(err, res);
                            done(err);
                        });
                    });

                    describe('and again', function () {
                        it('changes the last digit from 4 to 5', function (done) {
                            client.incr(key, function (err, res) {
                                helper.isString('9007199254740995')(err, res);
                                done(err);
                            });
                        });

                        describe('and again', function () {
                            it('changes the last digit from 5 to 6', function (done) {
                                client.incr(key, function (err, res) {
                                    helper.isString('9007199254740996')(err, res);
                                    done(err);
                                });
                            });

                            describe('and again', function () {
                                it('changes the last digit from 6 to 7', function (done) {
                                    client.incr(key, function (err, res) {
                                        helper.isString('9007199254740997')(err, res);
                                        done(err);
                                    });
                                });
                            });
                        });
                    });
                });
            });
        });
    });
});