Mocha test which successfully tests zipped stream (using onValues to force side effects).

test.js

var Bacon = require("baconjs"),
    assert = require("assert");

require('promise.prototype.finally');

describe("Testing stream equality logic", function(){

    it( "can match Bacon streams backed by the same array.", function(){
        var targetSequence = [
            ["oldmacdonald/farm", "['sheep','pig','cow','duck']" ] , //n.b. JSON.stringify of array
            ["oldmacdonald/farm/sheep", "'Baa'"] , //n.b. JSON.stringify of string (quoted)
            ["oldmacdonald/farm/pig", "'Oink'"] ,
            ["oldmacdonald/farm/cow", "'Moo'"] ,
            ["oldmacdonald/farm/duck", "'Quack'"] ,
        ];

        var actualSequence = targetSequence.slice(0);
        //adding lines below causes test to fail
        //actualSequence.pop();
        //actualSequence.push(["oldmacdonald/farm/horse", "'Neigh'"]);

        var targetStream = Bacon.sequentially(0, targetSequence);
        var actualStream = Bacon.sequentially(0, actualSequence);

        //var targetStream = Bacon.fromArray(targetSequence);
        //var actualStream = Bacon.fromArray(actualSequence);

        var deepEqual = function(target, actual){
            console.log("Testing " + JSON.stringify(target) + " versus " + JSON.stringify(actual) + "...");
            assert.deepEqual(target, actual);
            return true;
        };

        var zippedStream = Bacon.zipAsArray(targetStream, actualStream);
        zippedStream.onValues(deepEqual);
        return zippedStream.toPromise()
            .finally(function(){
                console.log("Stream finished");
            });
    });

});