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tests/conftest.py

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+import pytest
+
+pytest_plugins = ('pytest_asyncio',)
+
+@pytest.fixture(scope="session")
+def event_loop():
+    """Create an instance of the default event loop for each test case."""
+    import asyncio
+    loop = asyncio.get_event_loop_policy().new_event_loop()
+    yield loop
+    loop.close()