Copy async_lru for Python 3.7 compatibility

tests/external/conftest.py

@@ -0,0 +1,47 @@
+import asyncio
+import gc
+import os
+
+import pytest
+from great_ai.external.async_lru import _CacheInfo
+
+asyncio.set_event_loop(None)
+
+
+@pytest.fixture
+def event_loop(request):
+    loop = asyncio.new_event_loop()
+    loop.set_debug(bool(os.environ.get("PYTHONASYNCIODEBUG")))
+
+    yield loop
+
+    loop.call_soon(loop.stop)
+    loop.run_forever()
+    loop.close()
+
+    gc.collect()
+
+
+@pytest.fixture
+def loop(event_loop, request):
+    asyncio.set_event_loop(None)
+    request.addfinalizer(lambda: asyncio.set_event_loop(None))
+
+    return event_loop
+
+
+@pytest.fixture
+def check_lru(request):
+    def _check_lru(wrapped, *, hits, misses, cache, tasks, maxsize=128):
+        assert wrapped.hits == hits
+        assert wrapped.misses == misses
+        assert len(wrapped._cache) == cache
+        assert len(wrapped.tasks) == tasks
+        assert wrapped.cache_info() == _CacheInfo(
+            hits=hits,
+            misses=misses,
+            maxsize=maxsize,
+            currsize=cache,
+        )
+
+    return _check_lru