Initial Version of sitemap.xml spec
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tests/unit/queue.test.js
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317
tests/unit/queue.test.js
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/**
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* Unit Tests: FIFO Request Queue
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*
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* Tests T038-T039: Test FIFO queue implementation
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* Tests the queue.js module in isolation
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*
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* @module tests/unit/queue
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*/
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import { describe, it } from 'node:test';
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import assert from 'node:assert/strict';
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// =============================================================================
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// T038: Unit test for FIFO queue enqueue/dequeue
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// =============================================================================
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describe('T038: FIFO Queue Enqueue/Dequeue', () => {
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it('should enqueue and dequeue requests in FIFO order', async () => {
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// TODO: Import RequestQueue from src/queue.js
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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const results = [];
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// Enqueue 3 tasks
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const task1 = async () => {
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await delay(10);
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results.push('task1');
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return 'result1';
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};
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const task2 = async () => {
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await delay(10);
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results.push('task2');
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return 'result2';
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};
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const task3 = async () => {
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await delay(10);
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results.push('task3');
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return 'result3';
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};
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// Enqueue all tasks
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// const promise1 = queue.enqueue(task1);
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// const promise2 = queue.enqueue(task2);
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// const promise3 = queue.enqueue(task3);
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// Wait for all to complete
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// await Promise.all([promise1, promise2, promise3]);
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// Verify FIFO order
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// assert.deepEqual(results, ['task1', 'task2', 'task3'], 'Tasks should complete in FIFO order');
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});
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it('should process tasks sequentially (one at a time)', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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let activeTaskCount = 0;
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let maxActiveTaskCount = 0;
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const createTask = (id) => async () => {
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activeTaskCount++;
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maxActiveTaskCount = Math.max(maxActiveTaskCount, activeTaskCount);
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await delay(50);
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activeTaskCount--;
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return `task${id}`;
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};
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// Enqueue multiple tasks
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const promises = [];
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for (let i = 1; i <= 5; i++) {
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// promises.push(queue.enqueue(createTask(i)));
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}
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// await Promise.all(promises);
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// Verify only one task was active at a time
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// assert.equal(maxActiveTaskCount, 1, 'Only one task should be active at a time');
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});
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it('should maintain queue order when tasks are added during processing', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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const results = [];
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// Add initial task
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// queue.enqueue(async () => {
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// await delay(20);
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// results.push('task1');
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// });
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// Add second task after slight delay
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// await delay(5);
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// queue.enqueue(async () => {
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// await delay(10);
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// results.push('task2');
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// });
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// Add third task after slight delay
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// await delay(5);
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// queue.enqueue(async () => {
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// await delay(10);
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// results.push('task3');
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// });
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// Wait for all tasks to complete
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// await delay(100);
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// Verify order preserved
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// assert.deepEqual(results, ['task1', 'task2', 'task3'], 'Should maintain FIFO order even when tasks added during processing');
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});
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it('should return task result through promise', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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const task = async () => {
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return 'test-result';
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};
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// const result = await queue.enqueue(task);
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// assert.equal(result, 'test-result', 'Should return task result through promise');
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});
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it('should propagate task errors through promise', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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const task = async () => {
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throw new Error('Task failed');
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};
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// await assert.rejects(
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// async () => await queue.enqueue(task),
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// { message: 'Task failed' },
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// 'Should propagate task error'
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// );
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});
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});
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// =============================================================================
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// T039: Unit test for FIFO queue concurrent request handling
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// =============================================================================
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describe('T039: FIFO Queue Concurrent Request Handling', () => {
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it('should use processing flag to prevent simultaneous execution', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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let processingCheckpoints = [];
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const createTask = (id) => async () => {
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// Log when task starts
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processingCheckpoints.push({ id, event: 'start', time: Date.now() });
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await delay(30);
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// Log when task ends
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processingCheckpoints.push({ id, event: 'end', time: Date.now() });
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return id;
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};
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// Enqueue 3 tasks simultaneously
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const promises = [
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// queue.enqueue(createTask(1)),
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// queue.enqueue(createTask(2)),
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// queue.enqueue(createTask(3))
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];
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// await Promise.all(promises);
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// Verify processing flag prevented overlap
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// Check that task N ends before task N+1 starts
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// const task1End = processingCheckpoints.find(cp => cp.id === 1 && cp.event === 'end');
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// const task2Start = processingCheckpoints.find(cp => cp.id === 2 && cp.event === 'start');
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// const task2End = processingCheckpoints.find(cp => cp.id === 2 && cp.event === 'end');
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// const task3Start = processingCheckpoints.find(cp => cp.id === 3 && cp.event === 'start');
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// assert.ok(task1End.time <= task2Start.time, 'Task 2 should start after Task 1 ends');
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// assert.ok(task2End.time <= task3Start.time, 'Task 3 should start after Task 2 ends');
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});
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it('should clear processing flag after task completes', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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// Add task
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// await queue.enqueue(async () => {
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// await delay(10);
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// return 'done';
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// });
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// Verify processing flag is cleared (queue can accept new tasks)
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// assert.equal(queue.isProcessing(), false, 'Processing flag should be cleared after task completes');
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});
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it('should clear processing flag even if task throws error', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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// Add task that throws error
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try {
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// await queue.enqueue(async () => {
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// await delay(10);
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// throw new Error('Task failed');
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// });
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} catch (e) {
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// Expected error
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}
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// Verify processing flag is cleared (queue can accept new tasks)
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// assert.equal(queue.isProcessing(), false, 'Processing flag should be cleared even after task error');
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// Verify next task can be processed
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// const result = await queue.enqueue(async () => 'next-task');
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// assert.equal(result, 'next-task', 'Next task should process successfully after error');
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});
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it('should handle empty queue correctly (no processing when queue empty)', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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// Verify processing flag is false for empty queue
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// assert.equal(queue.isProcessing(), false, 'Processing flag should be false for empty queue');
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// assert.equal(queue.getQueueLength(), 0, 'Queue should be empty');
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});
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it('should use EventEmitter for queue management', async () => {
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// Per task spec: "Implement FIFO request queue class in src/queue.js using Node.js EventEmitter"
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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// Verify queue extends or uses EventEmitter
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// assert.ok(queue.on, 'Queue should have EventEmitter methods');
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// assert.ok(queue.emit, 'Queue should have emit method');
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});
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it('should maintain queue array for pending tasks', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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// Add tasks without waiting
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// queue.enqueue(async () => {
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// await delay(50);
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// return 'task1';
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// });
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// queue.enqueue(async () => 'task2');
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// queue.enqueue(async () => 'task3');
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// Check queue length while first task is processing
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// await delay(10); // Let first task start processing
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// Queue should have 2 pending tasks (task2 and task3)
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// Note: task1 is being processed, not in queue
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// assert.ok(queue.getQueueLength() >= 2, 'Queue should contain pending tasks');
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});
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it('should process queue in correct order after processing flag is cleared', async () => {
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// TODO: Import RequestQueue
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// const { RequestQueue } = await import('../../src/queue.js');
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// const queue = new RequestQueue();
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const results = [];
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// Add first task (starts processing immediately)
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// queue.enqueue(async () => {
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// await delay(30);
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// results.push('task1');
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// });
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// Add more tasks while first is processing
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// await delay(5);
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// queue.enqueue(async () => {
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// results.push('task2');
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// });
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// queue.enqueue(async () => {
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// results.push('task3');
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// });
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// Wait for all to complete
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// await delay(100);
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// Verify FIFO order maintained
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// assert.deepEqual(results, ['task1', 'task2', 'task3'], 'Should process in FIFO order after processing flag cleared');
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});
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});
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// =============================================================================
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// Helper Functions
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// =============================================================================
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/**
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* Delay helper for async tests
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* @param {number} ms - Milliseconds to delay
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* @returns {Promise<void>}
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*/
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function delay(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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