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#!/usr/bin/env python
# Copyright 2025 The HuggingFace Inc. team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import threading
import time
from queue import Queue
from torch.multiprocessing import Queue as TorchMPQueue
from lerobot.rl.queue import get_last_item_from_queue
def test_get_last_item_single_item():
"""Test getting the last item when queue has only one item."""
queue = Queue()
queue.put("single_item")
result = get_last_item_from_queue(queue)
assert result == "single_item"
assert queue.empty()
def test_get_last_item_multiple_items():
"""Test getting the last item when queue has multiple items."""
queue = Queue()
items = ["first", "second", "third", "fourth", "last"]
for item in items:
queue.put(item)
result = get_last_item_from_queue(queue)
assert result == "last"
assert queue.empty()
def test_get_last_item_multiple_items_with_torch_queue():
"""Test getting the last item when queue has multiple items."""
queue = TorchMPQueue()
items = ["first", "second", "third", "fourth", "last"]
for item in items:
queue.put(item)
result = get_last_item_from_queue(queue)
assert result == "last"
assert queue.empty()
def test_get_last_item_different_types():
"""Test with different data types in the queue."""
queue = Queue()
items = [1, 2.5, "string", {"key": "value"}, [1, 2, 3], ("tuple", "data")]
for item in items:
queue.put(item)
result = get_last_item_from_queue(queue)
assert result == ("tuple", "data")
assert queue.empty()
def test_get_last_item_maxsize_queue():
"""Test with a queue that has a maximum size."""
queue = Queue(maxsize=5)
# Fill the queue
for i in range(5):
queue.put(i)
# Give the queue time to fill
time.sleep(0.1)
result = get_last_item_from_queue(queue)
assert result == 4
assert queue.empty()
def test_get_last_item_with_none_values():
"""Test with None values in the queue."""
queue = Queue()
items = [1, None, 2, None, 3]
for item in items:
queue.put(item)
# Give the queue time to fill
time.sleep(0.1)
result = get_last_item_from_queue(queue)
assert result == 3
assert queue.empty()
def test_get_last_item_blocking_timeout():
"""Test get_last_item_from_queue returns None on timeout."""
queue = Queue()
result = get_last_item_from_queue(queue, block=True, timeout=0.1)
assert result is None
def test_get_last_item_non_blocking_empty():
"""Test get_last_item_from_queue with block=False on an empty queue returns None."""
queue = Queue()
result = get_last_item_from_queue(queue, block=False)
assert result is None
def test_get_last_item_non_blocking_success():
"""Test get_last_item_from_queue with block=False on a non-empty queue."""
queue = Queue()
items = ["first", "second", "last"]
for item in items:
queue.put(item)
# Give the queue time to fill
time.sleep(0.1)
result = get_last_item_from_queue(queue, block=False)
assert result == "last"
assert queue.empty()
def test_get_last_item_blocking_waits_for_item():
"""Test that get_last_item_from_queue waits for an item if block=True."""
queue = Queue()
result = []
def producer():
queue.put("item1")
queue.put("item2")
def consumer():
# This will block until the producer puts the first item
item = get_last_item_from_queue(queue, block=True, timeout=0.2)
result.append(item)
producer_thread = threading.Thread(target=producer)
consumer_thread = threading.Thread(target=consumer)
producer_thread.start()
consumer_thread.start()
producer_thread.join()
consumer_thread.join()
assert result == ["item2"]
assert queue.empty()
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