ensure q.workersList() contains items being processed [fixes #1428] (#1429)

* ensure q.workersList() contains items being processed [fixes #1428]

* remove newline

* improve q.workersList() test

3 files changed, 120 insertions, 5 deletions

diff --git a/lib/internal/queue.js b/lib/internal/queue.js
index e357447..5e8d4d7 100644
--- a/lib/internal/queue.js
+++ b/lib/internal/queue.js
@@ -55,9 +55,10 @@ export default function queue(worker, concurrency, payload) {
 
             for (var i = 0, l = tasks.length; i < l; i++) {
                 var task = tasks[i];
+
                 var index = indexOf(workersList, task, 0);
                 if (index >= 0) {
-                    workersList.splice(index)
+                    workersList.splice(index, 1);
                 }
 
                 task.callback.apply(task, arguments);
@@ -118,11 +119,11 @@ export default function queue(worker, concurrency, payload) {
                 for (var i = 0; i < l; i++) {
                     var node = q._tasks.shift();
                     tasks.push(node);
+                    workersList.push(node);
                     data.push(node.data);
                 }
 
                 numRunning += 1;
-                workersList.push(tasks[0]);
 
                 if (q._tasks.length === 0) {
                     q.empty();
diff --git a/mocha_test/cargo.js b/mocha_test/cargo.js
index 235b9a2..55e6e96 100644
--- a/mocha_test/cargo.js
+++ b/mocha_test/cargo.js
@@ -236,7 +236,7 @@ describe('cargo', function () {
 
     it('expose payload', function (done) {
         var called_once = false;
-        var cargo= async.cargo(function(tasks, cb) {
+        var cargo = async.cargo(function(tasks, cb) {
             if (!called_once) {
                 expect(cargo.payload).to.equal(1);
                 assert(tasks.length === 1, 'should start with payload = 1');
@@ -261,4 +261,57 @@ describe('cargo', function () {
         }, 15);
     });
 
+    it('workersList', function(done) {
+        var called_once = false;
+
+        function getWorkersListData(cargo) {
+            return cargo.workersList().map(function(v) {
+                return v.data;
+            });
+        }
+
+        var cargo = async.cargo(function(tasks, cb) {
+            if (!called_once) {
+                expect(tasks).to.eql(['foo', 'bar']);
+            } else {
+                expect(tasks).to.eql(['baz']);
+            }
+            expect(getWorkersListData(cargo)).to.eql(tasks);
+            async.setImmediate(function() {
+                // ensure nothing has changed
+                expect(getWorkersListData(cargo)).to.eql(tasks);
+                called_once = true;
+                cb();
+            });
+        }, 2);
+
+        cargo.drain = function() {
+            expect(cargo.workersList()).to.eql([]);
+            expect(cargo.running()).to.equal(0);
+            done();
+        };
+
+        cargo.push('foo');
+        cargo.push('bar');
+        cargo.push('baz');
+    });
+
+    it('running', function(done) {
+        var cargo = async.cargo(function(tasks, cb) {
+            expect(cargo.running()).to.equal(1);
+            async.setImmediate(function() {
+                expect(cargo.running()).to.equal(1);
+                cb();
+            });
+        }, 2);
+
+        cargo.drain = function() {
+            expect(cargo.running()).to.equal(0);
+            done();
+        };
+
+        cargo.push('foo');
+        cargo.push('bar');
+        cargo.push('baz');
+    })
 });
diff --git a/mocha_test/queue.js b/mocha_test/queue.js
index 7525c30..4539c14 100644
--- a/mocha_test/queue.js
+++ b/mocha_test/queue.js
@@ -656,7 +656,7 @@ describe('queue', function(){
         });
     });
 
-    context('q.unsaturated(): ',function() {
+    context('q.unsaturated(): ', function() {
         it('should have a default buffer property that equals 25% of the concurrenct rate', function(done){
             var calls = [];
             var q = async.queue(function(task, cb) {
@@ -719,6 +719,68 @@ describe('queue', function(){
         });
     });
 
+    context('workersList', function() {
+        it('should be the same length as running()', function(done) {
+            var q = async.queue(function(task, cb) {
+                async.setImmediate(function() {
+                    expect(q.workersList().length).to.equal(q.running());
+                    cb();
+                });
+            }, 2);
+
+            q.drain = function() {
+                expect(q.workersList().length).to.equal(0);
+                expect(q.running()).to.equal(0);
+                done();
+            };
+
+            q.push('foo');
+            q.push('bar');
+            q.push('baz');
+        });
+
+        it('should contain the items being processed', function(done) {
+            var itemsBeingProcessed = {
+                'foo': ['foo'],
+                'foo_cb': ['foo', 'bar'],
+                'bar': ['foo', 'bar'],
+                'bar_cb': ['bar', 'baz'],
+                'baz': ['bar', 'baz'],
+                'baz_cb': ['baz']
+            };
+
+            function getWorkersListData(q) {
+                return q.workersList().map(function(v) {
+                    return v.data;
+                });
+            }
+
+            var q = async.queue(function(task, cb) {
+                expect(
+                    getWorkersListData(q)
+                ).to.eql(itemsBeingProcessed[task]);
+                expect(q.workersList().length).to.equal(q.running());
+                async.setImmediate(function() {
+                    expect(
+                        getWorkersListData(q)
+                    ).to.eql(itemsBeingProcessed[task+'_cb']);
+                    expect(q.workersList().length).to.equal(q.running());
+                    cb();
+                });
+            }, 2);
+
+            q.drain = function() {
+                expect(q.workersList()).to.eql([]);
+                expect(q.workersList().length).to.equal(q.running());
+                done();
+            };
+
+            q.push('foo');
+            q.push('bar');
+            q.push('baz');
+        });
+    })
+
     it('remove', function(done) {
         var result = [];
         var q = async.queue(function(data, cb) {
@@ -738,4 +800,3 @@ describe('queue', function(){
         }
     });
 });
-