fix execution order

#1229

2 files changed, 30 insertions, 0 deletions

diff --git a/lib/priorityQueue.js b/lib/priorityQueue.js
index 147a009..d8b6016 100644
--- a/lib/priorityQueue.js
+++ b/lib/priorityQueue.js
@@ -51,6 +51,7 @@ export default function(worker, concurrency) {
             });
         }
 
+        priority = priority || 0;
         var nextNode = q._tasks.head;
         while (nextNode && priority >= nextNode.priority) {
             nextNode = nextNode.next;
diff --git a/mocha_test/priorityQueue.js b/mocha_test/priorityQueue.js
index b777815..f71e665 100644
--- a/mocha_test/priorityQueue.js
+++ b/mocha_test/priorityQueue.js
@@ -108,6 +108,35 @@ describe('priorityQueue', function() {
         };
     });
 
+    it('pause in worker with concurrency', function(done) {
+        var call_order = [];
+        var q = async.priorityQueue(function (task, callback) {
+            if (task.isLongRunning) {
+                q.pause();
+                setTimeout(function () {
+                    call_order.push(task.id);
+                    q.resume();
+                    callback();
+                }, 50);
+            }
+            else {
+                call_order.push(task.id);
+                setTimeout(callback, 10);
+            }
+        }, 10);
+
+        q.push({ id: 1, isLongRunning: true});
+        q.push({ id: 2 });
+        q.push({ id: 3 });
+        q.push({ id: 4 });
+        q.push({ id: 5 });
+
+        q.drain = function () {
+            expect(call_order).to.eql([1, 2, 3, 4, 5]);
+            done();
+        };
+    });
+
     context('q.saturated(): ', function() {
         it('should call the saturated callback if tasks length is concurrency', function(done) {
             var calls = [];