Add zscan test

test/commands/zscan.spec.js

@@ -0,0 +1,50 @@
+'use strict';
+
+var config = require('../lib/config');
+var helper = require('../helper');
+var assert = require('assert');
+var redis = config.redis;
+
+describe("The 'zscan' method", function () {
+
+    helper.allTests(function(parser, ip, args) {
+
+        describe("using " + parser + " and " + ip, function () {
+            var client;
+
+            beforeEach(function (done) {
+                client = redis.createClient.apply(redis.createClient, args);
+                client.once("ready", function () {
+                    client.flushdb(done);
+                });
+            });
+
+            it('return values', function (done) {
+                if (helper.redisProcess().spawnFailed()) this.skip();
+                helper.serverVersionAtLeast.call(this, client, [2, 8, 0]);
+                var hash = {};
+                var set = [];
+                var zset = ["zset:1"];
+                for (var i = 0; i < 500; i++) {
+                    hash["key_" + i] = "value_" + i;
+                    set.push("member_" + i);
+                    zset.push(i, "z_member_" + i);
+                }
+                client.hmset("hash:1", hash);
+                client.sadd("set:1", set);
+                client.zadd(zset);
+                client.zscan('zset:1', 0, 'MATCH', '*', 'COUNT', 500, function (err, res) {
+                    assert(!err);
+                    assert.strictEqual(res.length, 2);
+                    assert.strictEqual(res[1].length, 1000);
+                    done();
+                });
+            });
+
+            afterEach(function () {
+                client.end();
+            });
+        });
+    });
+
+});