node-red/test/nodes/core/logic/17-split_spec.js

/**
 * Copyright JS Foundation and other contributors, http://js.foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

var should = require("should");
var splitNode = require("nr-test-utils").require("@node-red/nodes/core/logic/17-split.js");
var joinNode = require("nr-test-utils").require("@node-red/nodes/core/logic/17-split.js");
var helper = require("node-red-node-test-helper");
var RED = require("nr-test-utils").require("node-red/lib/red.js");
var Context = require("nr-test-utils").require("@node-red/runtime/lib/nodes/context");

var TimeoutForErrorCase = 20;

describe('SPLIT node', function() {

    before(function(done) {
        helper.startServer(done);
    });

    after(function(done) {
        helper.stopServer(done);
    });

    afterEach(function() {
        helper.unload();
    });

    it('should be loaded', function(done) {
        var flow = [{id:"splitNode1", type:"split", name:"splitNode" }];
        helper.load(splitNode, flow, function() {
            var splitNode1 = helper.getNode("splitNode1");
            splitNode1.should.have.property('name', 'splitNode');
            done();
        });
    });

    it('should split an array into multiple messages', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]]},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count",4);
                msg.parts.should.have.property("type","array");
                msg.parts.should.have.property("index");
                if (msg.parts.index === 0) { msg.payload.should.equal(1); }
                if (msg.parts.index === 1) { msg.payload.should.equal(2); }
                if (msg.parts.index === 2) { msg.payload.should.equal(3); }
                if (msg.parts.index === 3) { msg.payload.should.equal(4); done(); }
            });
            sn1.receive({payload:[1,2,3,4]});
        });
    });

    it('should split an array into multiple messages of a specified size', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]], arraySplt:3, arraySpltType:"len"},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count",2);
                msg.parts.should.have.property("type","array");
                msg.parts.should.have.property("index");
                msg.payload.should.be.an.Array();
                if (msg.parts.index === 0) { msg.payload.length.should.equal(3); }
                if (msg.parts.index === 1) { msg.payload.length.should.equal(1); done(); }
            });
            sn1.receive({payload:[1,2,3,4]});
        });
    });

    it('should split an object into pieces', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]]},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            var count = 0;
            sn2.on("input", function(msg) {
                msg.should.have.property("payload");
                msg.should.have.property("parts");
                msg.parts.should.have.property("type","object");
                msg.parts.should.have.property("key");
                msg.parts.should.have.property("count");
                msg.parts.should.have.property("index");
                msg.topic.should.equal("foo");
                if (msg.parts.index === 0) { msg.payload.should.equal(1); }
                if (msg.parts.index === 1) { msg.payload.should.equal("2"); }
                if (msg.parts.index === 2) { msg.payload.should.equal(true); done(); }
            });
            sn1.receive({topic:"foo",payload:{a:1,b:"2",c:true}});
        });
    });

    it('should split an object into pieces and overwrite their topics', function(done) {
        var flow = [{id:"sn1", type:"split", addname:"topic", wires:[["sn2"]]},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            var count = 0;
            sn2.on("input", function(msg) {
                msg.should.have.property("payload");
                msg.should.have.property("parts");
                msg.parts.should.have.property("type","object");
                msg.parts.should.have.property("key");
                msg.parts.should.have.property("count");
                msg.parts.should.have.property("index");
                if (msg.parts.index === 0) { msg.payload.should.equal(1); msg.topic.should.equal("a"); }
                if (msg.parts.index === 1) { msg.payload.should.equal("2"); msg.topic.should.equal("b"); }
                if (msg.parts.index === 2) { msg.payload.should.equal(true); msg.topic.should.equal("c"); done(); }
            });
            sn1.receive({topic:"foo",payload:{a:1,b:"2",c:true}});
        });
    });

    it('should split a string into new-lines', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]]},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count",4);
                msg.parts.should.have.property("type","string");
                msg.parts.should.have.property("index");
                if (msg.parts.index === 0) { msg.payload.should.equal("Da"); }
                if (msg.parts.index === 1) { msg.payload.should.equal("ve"); }
                if (msg.parts.index === 2) { msg.payload.should.equal(" "); }
                if (msg.parts.index === 3) { msg.payload.should.equal("CJ"); done(); }
            });
            sn1.receive({payload:"Da\nve\n \nCJ"});
        });
    });

    it('should split a string on a specified char', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]], splt:"\n"},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count",3);
                msg.parts.should.have.property("ch","\n");
                msg.parts.should.have.property("index");
                msg.parts.should.have.property("type","string");
                if (msg.parts.index === 0) { msg.payload.should.equal("1"); }
                if (msg.parts.index === 1) { msg.payload.should.equal("2"); }
                if (msg.parts.index === 2) { msg.payload.should.equal("3"); done(); }
            });
            sn1.receive({payload:"1\n2\n3"});
        });
    });

    it('should split a string into lengths', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]], splt:"2", spltType:"len"},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count",4);
                msg.parts.should.have.property("ch","");
                msg.parts.should.have.property("index");
                msg.parts.should.have.property("type","string");
                if (msg.parts.index === 0) { msg.payload.should.equal("12"); }
                if (msg.parts.index === 1) { msg.payload.should.equal("34"); }
                if (msg.parts.index === 2) { msg.payload.should.equal("56"); }
                if (msg.parts.index === 3) { msg.payload.should.equal("78"); done(); }
            });
            sn1.receive({payload:"12345678"});
        });
    });

    it('should split a string on a specified char in stream mode', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]], splt:"\n", stream:true},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("ch","\n");
                msg.parts.should.have.property("index");
                msg.parts.should.have.property("type","string");
                if (msg.parts.index === 0) { msg.payload.should.equal("1"); }
                if (msg.parts.index === 1) { msg.payload.should.equal("2"); }
                if (msg.parts.index === 2) { msg.payload.should.equal("3"); }
                if (msg.parts.index === 3) { msg.payload.should.equal("4"); }
                if (msg.parts.index === 4) { msg.payload.should.equal("5"); }
                if (msg.parts.index === 5) { msg.payload.should.equal("6"); done(); }
            });
            sn1.receive({payload:"1\n2\n3\n"});
            sn1.receive({payload:"4\n5\n6\n"});
        });
    });

    it('should split a buffer into lengths', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]], splt:"2", spltType:"len"},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                try {
                    //console.log(msg);
                    msg.should.have.property("parts");
                    Buffer.isBuffer(msg.payload).should.be.true();
                    msg.parts.should.have.property("count",4);
                    msg.parts.should.have.property("index");
                    msg.parts.should.have.property("type","buffer");
                    if (msg.parts.index === 0) { msg.payload.toString().should.equal("12"); }
                    if (msg.parts.index === 1) { msg.payload.toString().should.equal("34"); }
                    if (msg.parts.index === 2) { msg.payload.toString().should.equal("56"); }
                    if (msg.parts.index === 3) { msg.payload.toString().should.equal("78"); done(); }
                } catch(err) {
                    done(err);
                }
            });
            var b = new Buffer.from("12345678");
            sn1.receive({payload:b});
        });
    });

    it('should split a buffer on another buffer (streaming)', function(done) {
        var flow = [{id:"sn1", type:"split", wires:[["sn2"]], splt:"[52]", spltType:"bin", stream:true},
                    {id:"sn2", type:"helper"}];
        helper.load(splitNode, flow, function() {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function(msg) {
                try {
                    msg.should.have.property("parts");
                    Buffer.isBuffer(msg.payload).should.be.true();
                    msg.parts.should.have.property("index");
                    msg.parts.should.have.property("type","buffer");
                    if (msg.parts.index === 0) { msg.payload.toString().should.equal("123"); }
                    if (msg.parts.index === 1) { msg.payload.toString().should.equal("123"); }
                    if (msg.parts.index === 2) { msg.payload.toString().should.equal("123"); done(); }
                } catch(err) {
                    done(err);
                }
            });
            var b1 = new Buffer.from("123412");
            var b2 = new Buffer.from("341234");
            sn1.receive({payload:b1});
            sn1.receive({payload:b2});
        });
    });

    it('should handle invalid spltType (not an array)', function (done) {
        var flow = [{ id: "sn1", type: "split", splt: "1", spltType: "bin", wires: [["sn2"]] },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            sn2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            sn1.receive({ payload: "123" });
        });
    });

    it('should handle invalid splt length', function (done) {
        var flow = [{ id: "sn1", type: "split", splt: 0, spltType: "len", wires: [["sn2"]] },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            sn2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            sn1.receive({ payload: "123" });
        });
    });

    it('should handle invalid array splt length', function (done) {
        var flow = [{ id: "sn1", type: "split", arraySplt: 0, arraySpltType: "len", wires: [["sn2"]] },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            sn2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            sn1.receive({ payload: "123" });
        });
    });

    it('should ceil count value when msg.payload type is string', function (done) {
        var flow = [{ id: "sn1", type: "split", splt: "2", spltType: "len", wires: [["sn2"]] },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function (msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count", 2);
                msg.parts.should.have.property("index");
                if (msg.parts.index === 0) { msg.payload.length.should.equal(2); }
                if (msg.parts.index === 1) { msg.payload.length.should.equal(1); done(); }
            });
            sn1.receive({ payload: "123" });
        });
    });

    it('should handle spltBufferString value of undefined', function (done) {
        var flow = [{ id: "sn1", type: "split", wires: [["sn2"]], splt: "[52]", spltType: "bin" },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function (msg) {
                try {
                    msg.should.have.property("parts");
                    msg.parts.should.have.property("index");
                    if (msg.parts.index === 0) { msg.payload.toString().should.equal("123"); done(); }
                } catch (err) {
                    done(err);
                }
            });
            sn1.receive({ payload: "123" });
        });
    });

    it('should ceil count value when msg.payload type is Buffer', function (done) {
        var flow = [{ id: "sn1", type: "split", splt: "2", spltType: "len", wires: [["sn2"]] },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function (msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count", 2);
                msg.parts.should.have.property("index");
                if (msg.parts.index === 0) { msg.payload.length.should.equal(2); }
                if (msg.parts.index === 1) { msg.payload.length.should.equal(1); done(); }
            });
            var b = new Buffer.from("123");
            sn1.receive({ payload: b });
        });
    });

    it('should set msg.parts.ch when node.spltType is str', function (done) {
        var flow = [{ id: "sn1", type: "split", splt: "2", spltType: "str", stream: false, wires: [["sn2"]] },
                    { id: "sn2", type: "helper" }];
        helper.load(splitNode, flow, function () {
            var sn1 = helper.getNode("sn1");
            var sn2 = helper.getNode("sn2");
            sn2.on("input", function (msg) {
                msg.should.have.property("parts");
                msg.parts.should.have.property("count", 2);
                msg.parts.should.have.property("index");
                if (msg.parts.index === 0) { msg.payload.length.should.equal(2); }
                if (msg.parts.index === 1) { msg.payload.length.should.equal(1); done(); }
            });
            var b = new Buffer.from("123");
            sn1.receive({ payload: b });
        });
    });

});

describe('JOIN node', function() {

    beforeEach(function(done) {
        helper.startServer(done);
    });

    function initContext(done) {
        Context.init({
            contextStorage: {
                memory: {
                    module: "memory"
                }
            }
        });
        Context.load().then(function () {
            done();
        });
    }

    afterEach(function(done) {
        helper.unload().then(function(){
            return Context.clean({allNodes:{}});
        }).then(function(){
            return Context.close();
        }).then(function(){
            RED.settings.nodeMessageBufferMaxLength = 0;
            helper.stopServer(done);
        });
    });

    it('should be loaded', function(done) {
        var flow = [{id:"joinNode1", type:"join", name:"joinNode" }];
        helper.load(joinNode, flow, function() {
            var joinNode1 = helper.getNode("joinNode1");
            joinNode1.should.have.property('name', 'joinNode');
            joinNode1.should.have.property('count', 0);
            joinNode1.should.have.property('timer', 0);
            joinNode1.should.have.property('build', 'array');
            done();
        });
    });

    it('should join bits of string back together automatically', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], joiner:",", build:"string", mode:"auto"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal("A,B,C,D");
                    done();
                }
                catch(e) {done(e);}
            });
            n1.receive({payload:"A", parts:{id:1, type:"string", ch:",", index:0, count:4}});
            n1.receive({payload:"B", parts:{id:1, type:"string", ch:",", index:1, count:4}});
            n1.receive({payload:"C", parts:{id:1, type:"string", ch:",", index:2, count:4}});
            n1.receive({payload:"D", parts:{id:1, type:"string", ch:",", index:3, count:4}});
        });
    });
    it('should join bits of string back together automatically with a buffer joiner', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], joiner:"[44]", joinerType:"bin", build:"string", mode:"auto"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal("A,B,C,D");
                    done();
                }
                catch(e) {done(e);}
            });
            n1.receive({payload:"A", parts:{id:1, type:"string", ch:",", index:0, count:4}});
            n1.receive({payload:"B", parts:{id:1, type:"string", ch:",", index:1, count:4}});
            n1.receive({payload:"C", parts:{id:1, type:"string", ch:",", index:2, count:4}});
            n1.receive({payload:"D", parts:{id:1, type:"string", ch:",", index:3, count:4}});
        });
    });

    it('should join bits of buffer back together automatically', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], joiner:",", build:"buffer", mode:"auto"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    Buffer.isBuffer(msg.payload).should.be.true();
                    msg.payload.toString().should.equal("A-B-C-D");
                    done();
                }
                catch(e) {done(e);}
            });
            n1.receive({payload:Buffer.from("A"), parts:{id:1, type:"buffer", ch:Buffer.from("-"), index:0, count:4}});
            n1.receive({payload:Buffer.from("B"), parts:{id:1, type:"buffer", ch:Buffer.from("-"), index:1, count:4}});
            n1.receive({payload:Buffer.from("C"), parts:{id:1, type:"buffer", ch:Buffer.from("-"), index:2, count:4}});
            n1.receive({payload:Buffer.from("D"), parts:{id:1, type:"buffer", ch:Buffer.from("-"), index:3, count:4}});
        });
    });

    it('should join things into an array after a count', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], count:3, joiner:",",mode:"custom"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.Array();
                    msg.payload[0].should.equal(1);
                    msg.payload[1].should.equal(true);
                    //msg.payload[2].a.should.equal(1);
                    done();
                }
                catch(e) {done(e);}
            });
            n1.receive({payload:1});
            n1.receive({payload:true});
            n1.receive({payload:{a:1}});
        });
    });

    it('should join things into an object after a count', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], count:5, build:"object", mode:"custom"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.have.property("a",1);
                    msg.payload.should.have.property("b","2");
                    msg.payload.should.have.property("c",true);
                    msg.payload.should.have.property("d");
                    msg.payload.d.should.have.property("e",7);
                    msg.payload.should.have.property("g");
                    msg.payload.g.should.have.property("f",6);
                    done();
                }
                catch(e) { done(e)}
            });
            n1.receive({payload:1, topic:"a"});
            n1.receive({payload:"2", topic:"b"});
            n1.receive({payload:true, topic:"c"});
            n1.receive({payload:{e:5}, topic:"d"});
            n1.receive({payload:{e:7}, topic:"d"});
            n1.receive({payload:{f:6}, topic:"g"});
        });
    });

    it('should merge objects', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], count:5, build:"merged", mode:"custom"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.have.property("a",1);
                    msg.payload.should.have.property("b",2);
                    msg.payload.should.have.property("c",3);
                    msg.payload.should.have.property("d",4);
                    msg.payload.should.have.property("e",5);
                    done();
                }
                catch(e) { done(e)}
            });
            n1.receive({payload:{a:9}, topic:"f"});
            n1.receive({payload:{a:1}, topic:"a"});
            n1.receive({payload:{b:9}, topic:"b"});
            n1.receive({payload:{b:2}, topic:"b"});
            n1.receive({payload:{c:3}, topic:"c"});
            n1.receive({payload:{d:4}, topic:"d"});
            n1.receive({payload:{e:5}, topic:"e"});
        });
    });

    it('should merge full msg objects', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], count:6, build:"merged", mode:"custom", propertyType:"full", property:""},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.payload.should.have.property("payload",7);
                    msg.payload.should.have.property("aha",'c');
                    msg.payload.should.have.property("bar",'b');
                    msg.payload.should.have.property("bingo",'e');
                    msg.payload.should.have.property("foo",'d');
                    msg.payload.should.have.property("topic",'a');
                    done();
                }
                catch(e) { done(e)}
            });
            n1.receive({payload:1, topic:"f"});
            n1.receive({payload:2, topic:"a"});
            n1.receive({payload:3, foo:"b"});
            n1.receive({payload:4, bar:"b"});
            n1.receive({payload:5, aha:"c"});
            n1.receive({payload:6, foo:"d"});
            n1.receive({payload:7, bingo:"e"});
        });
    });

    it('should accumulate a merged object', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], build:"merged",mode:"custom",accumulate:true, count:3},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var c = 0;
            n2.on("input", function(msg) {
                if (c === 3) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.have.property("a",3);
                        msg.payload.should.have.property("b",2);
                        msg.payload.should.have.property("c",1);
                        done();
                    }
                    catch(e) { done(e) }
                }
                c += 1;
            });
            n1.receive({payload:{a:1}, topic:"a"});
            n1.receive({payload:{b:2}, topic:"b"});
            n1.receive({payload:{c:3}, topic:"c"});
            n1.receive({payload:{a:3}, topic:"d"});
            n1.receive({payload:{b:2}, topic:"e"});
            n1.receive({payload:{c:1}, topic:"f"});
        });
    });

    it('should be able to reset an accumulation', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], build:"merged",accumulate:true,mode:"custom", count:3},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var c = 0;
            n2.on("input", function(msg) {
                if (c === 1) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.have.property("a",1);
                        msg.payload.should.have.property("b",2);
                        msg.payload.should.have.property("c",3);
                        msg.payload.should.have.property("d",4);
                    }
                    catch(e) { done(e) }
                }
                if (c === 2) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.have.property("e",2);
                        msg.payload.should.have.property("f",1);
                    }
                    catch(e) { done(e) }
                }
                if (c === 3) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.have.property("g",2);
                        msg.payload.should.have.property("h",1);
                        msg.payload.should.have.property("i",3);
                        done();
                    }
                    catch(e) { done(e) }
                }
                c += 1;
            });
            n1.receive({payload:{a:1}, topic:"a"});
            n1.receive({payload:{b:2}, topic:"b"});
            n1.receive({payload:{c:3}, topic:"c"});
            n1.receive({payload:{d:4}, topic:"d", complete:true});
            n1.receive({payload:{e:2}, topic:"e"});
            n1.receive({payload:{f:1}, topic:"f", complete:true});
            n1.receive({payload:{g:2}, topic:"g"});
            n1.receive({payload:{h:1}, topic:"h"});
            n1.receive({payload:{i:3}, topic:"i"});
        });
    });

    it('should accumulate a key/value object', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], build:"object", accumulate:true, mode:"custom", topic:"bar", key:"foo", count:4},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var c = 0;
            n2.on("input", function(msg) {
                try {
                    //msg.should.have.property("topic","bar");
                    msg.should.have.property("payload");
                    msg.payload.should.have.property("a",1);
                    msg.payload.should.have.property("b",2);
                    msg.payload.should.have.property("c",3);
                    msg.payload.should.have.property("d",4);
                    done();
                }
                catch(e) { done(e) }
            });
            n1.receive({payload:1, foo:"a"});
            n1.receive({payload:2, foo:"b"});
            n1.receive({payload:3, foo:"c"});
            n1.receive({payload:4, foo:"d"});
        });
    });

    it('should join strings with a specifed character after a timeout', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], build:"string", timeout:0.05, count:"", joiner:",",mode:"custom"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal("a,b,c");
                    done();
                }
                catch(e) { done(e) }
            });
            n1.receive({payload:"a"});
            n1.receive({payload:"b"});
            n1.receive({payload:"c"});
        });
    });

    it('should join strings with a specifed character and complete when told to', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], build:"string", timeout:5, count:0, joiner:"\n",mode:"custom"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal("Hello\nNodeRED\nWorld\n");
                    done();
                }
                catch(e) { done(e) }
            });
            n1.receive({payload:"Hello"});
            n1.receive({payload:"NodeRED"});
            n1.receive({payload:"World"});
            n1.receive({payload:'', complete:true});
        });
    });

    it('should join complete message objects into an array after a count', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], build:"array", timeout:0, count:3, propertyType:"full",mode:"custom"},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.payload.should.be.an.Array();
                    msg.payload[0].should.be.an.Object();
                    msg.payload[0].should.have.property("payload","a");
                    msg.payload[1].should.be.an.Object();
                    msg.payload[1].should.have.property("payload","b");
                    msg.payload[2].should.be.an.Object();
                    msg.payload[2].should.have.property("payload","c");
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:"a"});
            n1.receive({payload:"b"});
            n1.receive({payload:"c"});
        });
    });

    it('should join split things back into an array', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.Array();
                    msg.payload[0].should.equal(1);
                    msg.payload[1].should.equal(2);
                    msg.payload[2].should.equal(3);
                    msg.payload[3].should.equal(4);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, count:4, id:111}});
            n1.receive({payload:2, parts:{index:1, count:4, id:111}});
            n1.receive({payload:4, parts:{index:3, count:4, id:111}});
            n1.receive({payload:1, parts:{index:0, count:4, id:111}});
        });
    });

    it('should join split things back into an object', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.have.property("a",1);
                    msg.payload.should.have.property("b",2);
                    msg.payload.should.have.property("c",3);
                    msg.payload.should.have.property("d",4);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, count:4, id:222, key:"c", type:"object"}});
            n1.receive({payload:2, parts:{index:1, count:4, id:222, key:"b", type:"object"}});
            n1.receive({payload:4, parts:{index:3, count:4, id:222, key:"d", type:"object"}});
            n1.receive({payload:1, parts:{index:0, count:4, id:222, key:"a", type:"object"}});
        });
    });

    it('should join split things, send when told complete', function(done) {
        var flow = [{id:"n1", type:"join", wires:[["n2"]], timeout:0.250},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.Array();
                    (msg.payload[0] === undefined).should.be.true();
                    msg.payload[1].should.equal(2);
                    msg.payload[2].should.equal(3);
                    msg.payload[3].should.equal(4);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, count:4, id:444} });
            n1.receive({payload:2, parts:{index:1, count:4, id:444} });
            n1.receive({payload:4, parts:{index:3, count:4, id:444}, complete:true});
        });
    });

        it('should manually join things into an array, send when told complete', function(done) {
            var flow = [{id:"n1", type:"join", wires:[["n2"]], timeout:1, mode:"custom", build:"array"},
                        {id:"n2", type:"helper"}];
            helper.load(joinNode, flow, function() {
                var n1 = helper.getNode("n1");
                var n2 = helper.getNode("n2");
                n2.on("input", function(msg) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.be.an.Array();
                        msg.payload.length.should.equal(3);
                        msg.payload[0].should.equal(1);
                        msg.payload[1].should.equal(2);
                        msg.payload[2].should.equal(3);
                        done();
                    }
                    catch(e) { done(e); }
                });
                n1.receive({payload:1, topic:"A"});
                n1.receive({payload:2, topic:"B"});
                n1.receive({payload:3, topic:"C"});
                n1.receive({complete:true});
            });
        });


        it('should manually join things into an object, send when told complete', function(done) {
            var flow = [{id:"n1", type:"join", wires:[["n2"]], timeout:1, mode:"custom", build:"object"},
                        {id:"n2", type:"helper"}];
            helper.load(joinNode, flow, function() {
                var n1 = helper.getNode("n1");
                var n2 = helper.getNode("n2");
                n2.on("input", function(msg) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.be.an.Object();
                        Object.keys(msg.payload).length.should.equal(3);
                        msg.payload.A.should.equal(1);
                        msg.payload.B.should.equal(2);
                        msg.payload.C.should.equal(3);
                        done();
                    }
                    catch(e) { done(e); }
                });
                n1.receive({payload:1, topic:"A"});
                n1.receive({payload:2, topic:"B"});
                n1.receive({payload:3, topic:"C"});
                n1.receive({complete:true});
            });
        });

    it('should join split strings back into a word', function(done) {
        var flow = [{id:"n1", type:"join", mode:"auto", wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.String();
                    msg.payload.should.equal("abcd");
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:"a", parts:{type:'string',index:0, count:4, ch:"", id:555}});
            n1.receive({payload:"d", parts:{type:'string',index:3, count:4, ch:"", id:555}});
            n1.receive({payload:"c", parts:{type:'string',index:2, count:4, ch:"", id:555}});
            n1.receive({payload:"b", parts:{type:'string',index:1, count:4, ch:"", id:555}});
        });
    });

    it('should allow chained split-split-join-join sequences', function(done) {
        var flow = [{id:"s1", type:"split",wires:[["s2"]]},
                    {id:"s2", type:"split",wires:[["j1"]]},
                    {id:"j1", type:"join", mode:"auto", wires:[["j2"]]},
                    {id:"j2", type:"join", mode:"auto", wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var s1 = helper.getNode("s1");
            var n2 = helper.getNode("n2");
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.eql([[1,2,3],"a\nb\nc",[7,8,9]]);
                    done();
                }
                catch(e) { done(e); }
            });
            s1.receive({payload:[[1,2,3],"a\nb\nc",[7,8,9]]});
        });
    });

    it('should reduce messages', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+payload",
                     reduceInit:"0",
                     reduceInitType:"num",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal(10);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, count:4, id:222}});
            n1.receive({payload:2, parts:{index:1, count:4, id:222}});
            n1.receive({payload:4, parts:{index:3, count:4, id:222}});
            n1.receive({payload:1, parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages - count only in last part', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+payload",
                     reduceInit:"0",
                     reduceInitType:"num",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal(10);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, id:222}});
            n1.receive({payload:2, parts:{index:1, id:222}});
            n1.receive({payload:4, parts:{index:3, count:4,id:222}});
            n1.receive({payload:1, parts:{index:0, id:222}});
        });
    });

    function checkInitTypes(itype, ival, rval, initializer, checker, done) {
        var flow = [{id:"n1", z:"f0", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A",
                     reduceInit:ival,
                     reduceInitType:itype,
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        if (!initializer) {
            initializer = (node, cb) => {
                cb();
            };
        }
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            initializer(n1, function () {
                n2.on("input", function(msg) {
                    try {
                        msg.should.have.property("payload");
                        checker(msg.payload, rval);
                        done();
                    }
                    catch(e) { done(e); }
                });
                n1.receive({payload:3, parts:{index:2, count:4, id:222}});
                n1.receive({payload:2, parts:{index:1, count:4, id:222}});
                n1.receive({payload:4, parts:{index:3, count:4, id:222}});
                n1.receive({payload:1, parts:{index:0, count:4, id:222}});
            });
        });
    }

    function checkInitTypesSimple(itype, val, done) {
        checkInitTypes(itype, val, val, undefined, should.equal, done);
    }

    function checkInitTypesComplex(itype, ival, rval, done) {
        checkInitTypes(itype, ival, rval, undefined, should.deepEqual, done);
    }

    it('should reduce messages with init types (str)', function(done) {
        checkInitTypesSimple('str', "xyz", done);
    });

    it('should reduce messages with init types (num)', function(done) {
        checkInitTypesSimple('num', 10, done);
    });

    it('should reduce messages with init types (bool)', function(done) {
        checkInitTypesSimple('bool', true, done);
    });

    it('should reduce messages with init types (json)', function(done) {
        var ival = '{"x":"vx", "y":"vy", "z":"vz"}';
        var rval = JSON.parse(ival);
        checkInitTypesComplex('json', ival, rval, done);
    });

    it('should reduce messages with init types (bin)', function(done) {
        var ival = "[1,2,3]";
        var rval = Buffer.from(JSON.parse(ival));
        checkInitTypesComplex('bin', ival, rval, done);
    });

    it('should reduce messages with init types (JSONata)', function(done) {
        var ival = "1+2+3";
        var rval = 6;
        checkInitTypesComplex('jsonata', ival, rval, done);
    });

    it('should reduce messages with init types (env)', function(done) {
        function init(node, cb) {
            process.env.NR_XYZ = "nr_xyz";
            cb();
        }
        function fin(err) {
            delete process.env.NR_XYZ;
            done(err);
        }
        checkInitTypes('env', "NR_XYZ", "nr_xyz", init, should.equal, fin);
    });

    it('should reduce messages with init types (flow.name)', function(done) {
        function init(node, cb) {
            var context = node.context();
            context.flow.set("foo", "bar");
            cb();
        }
        checkInitTypes('flow', "foo", "bar", init, should.equal, done);
    });

    it('should reduce messages with init types (global.name)', function(done) {
        function init(node, cb) {
            var context = node.context();
            context.global.set("foo", "bar");
            cb();
        }
        checkInitTypes('global', "foo", "bar", init, should.equal, done);
    });

    it('should reduce messages using $I', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+$I",
                     reduceInit:"0",
                     reduceInitType:"num",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal(6);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, count:4, id:222}});
            n1.receive({payload:2, parts:{index:1, count:4, id:222}});
            n1.receive({payload:4, parts:{index:3, count:4, id:222}});
            n1.receive({payload:1, parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages with fixup', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+payload",
                     reduceInit:"0",
                     reduceInitType:"num",
                     reduceFixup:"$A/$N",
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal(2);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:3, parts:{index:2, count:5, id:222}});
            n1.receive({payload:2, parts:{index:1, count:5, id:222}});
            n1.receive({payload:4, parts:{index:3, count:5, id:222}});
            n1.receive({payload:1, parts:{index:0, count:5, id:222}});
            n1.receive({payload:0, parts:{index:4, count:5, id:222}});
        });
    });

    it('should reduce messages (left)', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"'(' & $A & '+' & payload & ')'",
                     reduceInit:"0",
                     reduceInitType:"str",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.String();
                    msg.payload.should.equal("((((0+1)+2)+3)+4)");
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:'3', parts:{index:2, count:4, id:222}});
            n1.receive({payload:'2', parts:{index:1, count:4, id:222}});
            n1.receive({payload:'4', parts:{index:3, count:4, id:222}});
            n1.receive({payload:'1', parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages (right)', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:true,
                     reduceExp:"'(' & $A & '+' & payload & ')'",
                     reduceInit:"0",
                     reduceInitType:"str",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.String();
                    msg.payload.should.equal("((((0+4)+3)+2)+1)");
                    done();
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:'3', parts:{index:2, count:4, id:222}});
            n1.receive({payload:'2', parts:{index:1, count:4, id:222}});
            n1.receive({payload:'4', parts:{index:3, count:4, id:222}});
            n1.receive({payload:'1', parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages with array result', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$append($A,[payload])",
                     reduceInit:"[]",
                     reduceInitType:"json",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.Array();
                    var payload = msg.payload;
                    payload.length.should.equal(2);
                    if (count == 0) {
                        payload[0].should.equal(1);
                        payload[1].should.equal(2);
                    }
                    else if (count == 1){
                        payload[0].should.equal(3);
                        payload[1].should.equal(4);
                        done();
                    }
                    count++;
                }
                catch(e) { done(e); }
            });
            n1.receive({payload:1, parts:{index:0, count:2, id:222}});
            n1.receive({payload:2, parts:{index:1, count:2, id:222}});
            n1.receive({payload:3, parts:{index:2, count:2, id:333}});
            n1.receive({payload:4, parts:{index:3, count:2, id:333}});
        });
    });

    it('should handle too many pending messages for reduce mode', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+payload",
                     reduceInit:"0",
                     reduceInitType:"num",
                     reduceFixup:undefined,
                     wires:[["n2"]]},
                    {id:"n2", type:"helper"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            RED.settings.nodeMessageBufferMaxLength = 2;
            setTimeout(function() {
                var logEvents = helper.log().args.filter(function (evt) {
                    return evt[0].type == "join";
                });
                var evt = logEvents[0][0];
                evt.should.have.property('id', "n1");
                evt.should.have.property('type', "join");
                evt.should.have.property('msg', "join.too-many");
                done();
            }, TimeoutForErrorCase);
            n1.receive({payload:3, parts:{index:2, count:4, id:222}});
            n1.receive({payload:2, parts:{index:1, count:4, id:222}});
            n1.receive({payload:4, parts:{index:3, count:4, id:222}});
            n1.receive({payload:1, parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages with flow context', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+(payload*$flowContext(\"two\"))",
                     reduceInit:"$flowContext(\"one\")",
                     reduceInitType:"jsonata",
                     reduceFixup:"$A*$flowContext(\"three\")",
                     wires:[["n2"]],z:"flow"},
                    {id:"n2", type:"helper",z:"flow"},
                    {id:"flow", type:"tab"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal(((((1+1*2)+2*2)+3*2)+4*2)*3);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.context().flow.set("one",1);
            n1.context().flow.set("two",2);
            n1.context().flow.set("three",3);
            n1.receive({payload:3, parts:{index:2, count:4, id:222}});
            n1.receive({payload:2, parts:{index:1, count:4, id:222}});
            n1.receive({payload:4, parts:{index:3, count:4, id:222}});
            n1.receive({payload:1, parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages with global context', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+(payload/$globalContext(\"two\"))",
                     reduceInit:"$globalContext(\"one\")",
                     reduceInitType:"jsonata",
                     reduceFixup:"$A*$globalContext(\"three\")",
                     wires:[["n2"]],z:"flow"},
                    {id:"n2", type:"helper",z:"flow"},
                    {id:"flow", type:"tab"}];
        helper.load(joinNode, flow, function() {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            var count = 0;
            n2.on("input", function(msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.equal(((((1+1/2)+2/2)+3/2)+4/2)*3);
                    done();
                }
                catch(e) { done(e); }
            });
            n1.context().global.set("one",1);
            n1.context().global.set("two",2);
            n1.context().global.set("three",3);
            n1.receive({payload:3, parts:{index:2, count:4, id:222}});
            n1.receive({payload:2, parts:{index:1, count:4, id:222}});
            n1.receive({payload:4, parts:{index:3, count:4, id:222}});
            n1.receive({payload:1, parts:{index:0, count:4, id:222}});
        });
    });

    it('should reduce messages with persistable flow context', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+(payload*$flowContext(\"two\",\"memory\"))",
                     reduceInit:"$flowContext(\"one\",\"memory\")",
                     reduceInitType:"jsonata",
                     reduceFixup:"$A*$flowContext(\"three\",\"memory\")",
                     wires:[["n2"]],z:"flow"},
                    {id:"n2", type:"helper",z:"flow"},
                    {id:"flow", type:"tab"}];
        helper.load(joinNode, flow, function() {
            initContext(function () {
                var n1 = helper.getNode("n1");
                var n2 = helper.getNode("n2");
                    try {
                    n2.on("input", function(msg) {
                        try {
                            msg.should.have.property("payload");
                            msg.payload.should.equal(((((1+1*2)+2*2)+3*2)+4*2)*3);
                            done();
                        }
                        catch(e) { done(e); }
                    });
                    n1.context().flow.set(["one","two","three"],[1,2,3],"memory",function(err){
                        if(err){
                            done(err);
                        } else{
                            n1.receive({payload:3, parts:{index:2, count:4, id:222}});
                            n1.receive({payload:2, parts:{index:1, count:4, id:222}});
                            n1.receive({payload:4, parts:{index:3, count:4, id:222}});
                            n1.receive({payload:1, parts:{index:0, count:4, id:222}});
                        }
                    });
                }catch(err) {
                done(err);
            }
            });
        });
    });

    it('should reduce messages with persistable global context', function(done) {
        var flow = [{id:"n1", type:"join", mode:"reduce",
                     reduceRight:false,
                     reduceExp:"$A+(payload/$globalContext(\"two\",\"memory\"))",
                     reduceInit:"$globalContext(\"one\",\"memory\")",
                     reduceInitType:"jsonata",
                     reduceFixup:"$A*$globalContext(\"three\",\"memory\")",
                     wires:[["n2"]],z:"flow"},
                    {id:"n2", type:"helper",z:"flow"},
                    {id:"flow", type:"tab"}];
        helper.load(joinNode, flow, function() {
            initContext(function () {
                var n1 = helper.getNode("n1");
                var n2 = helper.getNode("n2");
                n2.on("input", function(msg) {
                    try {
                        msg.should.have.property("payload");
                        msg.payload.should.equal(((((1+1/2)+2/2)+3/2)+4/2)*3);
                        done();
                    }
                    catch(e) { done(e); }
                });
                n1.context().global.set(["one","two","three"],[1,2,3],"memory",function(err){
                    if(err){
                        done(err);
                    } else{
                        n1.receive({payload:3, parts:{index:2, count:4, id:222}});
                        n1.receive({payload:2, parts:{index:1, count:4, id:222}});
                        n1.receive({payload:4, parts:{index:3, count:4, id:222}});
                        n1.receive({payload:1, parts:{index:0, count:4, id:222}});
                    }
                });
            });
        });
    });

    it('should handle invalid JSONata reduce expression - syntax error"', function (done) {
        var flow = [{
            id: "n1", type: "join", mode: "reduce",
            reduceRight: false,
            reduceExp: "invalid expr",
            reduceInit: "0",
            reduceInitType: "num",
            reduceFixup: undefined,
            wires: [["n2"]]
        },
        { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            n2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            n1.receive({ payload: "A", parts: { id: 1, type: "string", ch: ",", index: 0, count: 1 } });
        });
    });

    it('should handle invalid JSONata reduce expression - runtime error"', function (done) {
        var flow = [{
            id: "n1", type: "join", mode: "reduce",
            reduceRight: false,
            reduceExp: "$uknown()",
            reduceInit: "0",
            reduceInitType: "num",
            reduceFixup: undefined,
            wires: [["n2"]]
        },
        { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            n2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            n1.receive({ payload: "A", parts: { id: 1, type: "string", ch: ",", index: 0, count: 1 } });
        });
    });

    it('should handle invalid JSONata fixup expression - syntax err"', function (done) {
        var flow = [{
            id: "n1", type: "join", mode: "reduce",
            reduceRight: false,
            reduceExp: "$A",
            reduceInit: "0",
            reduceInitType: "num",
            reduceFixup: "invalid expr",
            wires: [["n2"]]
        },
        { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            n2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            n1.receive({ payload: "A", parts: { id: 1, type: "string", ch: ",", index: 0, count: 1 } });
        });
    });
    it('should handle invalid JSONata fixup expression - runtime err"', function (done) {
        var flow = [{
            id: "n1", type: "join", mode: "reduce",
            reduceRight: false,
            reduceExp: "$A",
            reduceInit: "0",
            reduceInitType: "num",
            reduceFixup: "$unknown()",
            wires: [["n2"]]
        },
        { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
            n2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            n1.receive({ payload: "A", parts: { id: 1, type: "string", ch: ",", index: 0, count: 1 } });
        });
    });

    it('should concat payload when group.type is array', function (done) {
        var flow = [{ id: "n1", type: "join", wires: [["n2"]], build: "array", mode: "auto" },
                    { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function (msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.should.be.an.Array();
                    msg.payload[0].should.equal("ab");
                    msg.payload[1].should.equal("cd");
                    msg.payload[2].should.equal("ef");
                    done();
                }
                catch (e) { done(e); }
            });
            n1.receive({ payload: "ab", parts: { id: 1, type: "array", ch: ",", index: 0, count: 3, len:2}});
            n1.receive({ payload: "cd", parts: { id: 1, type: "array", ch: ",", index: 1, count: 3, len:2}});
            n1.receive({ payload: "ef", parts: { id: 1, type: "array", ch: ",", index: 2, count: 3, len:2}});
        });
    });

    it('should concat payload when group.type is buffer and group.joinChar is undefined', function (done) {
        var flow = [{ id: "n1", type: "join", wires: [["n2"]], joiner: ",", build: "buffer", mode: "auto" },
                    { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function (msg) {
                try {
                    msg.should.have.property("payload");
                    Buffer.isBuffer(msg.payload).should.be.true();
                    msg.payload.toString().should.equal("ABC");
                    done();
                }
                catch (e) { done(e); }
            });
            n1.receive({ payload: Buffer.from("A"), parts: { id: 1, type: "buffer", index: 0, count: 3 } });
            n1.receive({ payload: Buffer.from("B"), parts: { id: 1, type: "buffer", index: 1, count: 3 } });
            n1.receive({ payload: Buffer.from("C"), parts: { id: 1, type: "buffer", index: 2, count: 3 } });
        });
    });

    it('should concat payload when group.type is string and group.joinChar is not string', function (done) {
        var flow = [{ id: "n1", type: "join", wires: [["n2"]], joiner: ",", build: "buffer", mode: "auto" },
                    { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function (msg) {
                try {
                    msg.should.have.property("payload");
                    msg.payload.toString().should.equal("A0B0C");
                    done();
                }
                catch (e) { done(e); }
            });
            n1.receive({ payload: Buffer.from("A"), parts: { id: 1, type: "string", ch: Buffer.from("0"), index: 0, count: 3 } });
            n1.receive({ payload: Buffer.from("B"), parts: { id: 1, type: "string", ch: Buffer.from("0"), index: 1, count: 3 } });
            n1.receive({ payload: Buffer.from("C"), parts: { id: 1, type: "string", ch: Buffer.from("0"), index: 2, count: 3 } });
        });
    });

    it('should handle msg.parts property when mode is auto and parts or id are missing', function (done) {
        var flow = [{ id: "n1", type: "join", wires: [["n2"]], joiner: "[44]", joinerType: "bin", build: "string", mode: "auto" },
                    { id: "n2", type: "helper" }];
        helper.load(joinNode, flow, function () {
            var n1 = helper.getNode("n1");
            var n2 = helper.getNode("n2");
            n2.on("input", function (msg) {
                done(new Error("This path does not go through."));
            });
            n1.receive({ payload: "A", parts: { type: "string", ch: ",", index: 0, count: 2 } });
            n1.receive({ payload: "B", parts: { type: "string", ch: ",", index: 1, count: 2 } });
            setTimeout(function () {
                done();
            }, TimeoutForErrorCase);
        });
    });

});