feat: add async job queue

tests/test_queue.py

@@ -0,0 +1,40 @@
+import pytest
+import asyncio
+
+from app.queue import JobQueue
+
+
+@pytest.mark.asyncio
+async def test_enqueue_and_dequeue():
+    queue = JobQueue()
+
+    await queue.enqueue("job_123")
+    job_id = await queue.dequeue()
+
+    assert job_id == "job_123"
+
+
+@pytest.mark.asyncio
+async def test_queue_ordering():
+    queue = JobQueue()
+
+    await queue.enqueue("job_1")
+    await queue.enqueue("job_2")
+    await queue.enqueue("job_3")
+
+    assert await queue.dequeue() == "job_1"
+    assert await queue.dequeue() == "job_2"
+    assert await queue.dequeue() == "job_3"
+
+
+@pytest.mark.asyncio
+async def test_queue_size():
+    queue = JobQueue()
+
+    assert queue.size() == 0
+    await queue.enqueue("job_1")
+    assert queue.size() == 1
+    await queue.enqueue("job_2")
+    assert queue.size() == 2
+    await queue.dequeue()
+    assert queue.size() == 1