fix: make sure to remove failed items from queue

lib/PTask.ts

@@ -86,13 +86,16 @@ export class PTask<T, R> {
   }
 
   public async run(): Promise<R> {
-    const newRes = await ProcessingPriorityQueue.getInstance(
-      this.queueName
-    ).enqueue(this);
-    const result = this.resultsMerge(this.resSoFar, newRes);
-    this.removeSelfFromQueue();
-    this._status = "completed";
-    return result;
+    try {
+      const newRes = await ProcessingPriorityQueue.getInstance(
+        this.queueName
+      ).enqueue(this);
+
+      return this.resultsMerge(this.resSoFar, newRes);
+    } finally {
+      this.removeSelfFromQueue();
+      this._status = "completed";
+    }
   }
 
   public async pause(): Promise<void> {

tests/unit/PTask.test.ts

@@ -670,7 +670,7 @@ describe("PriorityTask", () => {
     });
   });
 
-  it("should be removed from the queue when complete", (done) => {
+  it("should be removed from the queue when complete successfully", (done) => {
     const ptask = new PTask<void, void>({
       args: undefined,
       priority: 1,
@@ -685,6 +685,23 @@ describe("PriorityTask", () => {
     });
     expect(PTask.getAllPTasks("krombopulos").length).toBe(1);
   });
+
+  it('should be removed from the queue when complete unsuccessfully', (done) => {
+    const ptask = new PTask<void, void>({
+      args: undefined,
+      priority: 1,
+      onRun: async () =>
+        await new Promise((resolve, reject) => setTimeout(reject, 500)),
+      queueName: "krombopulos-2",
+    });
+
+    ptask.run()
+    .catch(() => {
+      expect(PTask.getAllPTasks("krombopulos-2").length).toBe(0);
+      done();
+    });
+    expect(PTask.getAllPTasks("krombopulos-2").length).toBe(1);
+  })
 
   it("should not schedule more than concurrencyLimit items", (done) => {
     const CONCURRENCY_LIMIT = 2;