# Copyright The Lightning AI team.
#
# 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,
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from lightning.pytorch.accelerators import AcceleratorRegistry


def test_available_accelerators_in_registry():
    """Tests the accelerators available by default, not including external, third-party accelerators."""
    available = set(AcceleratorRegistry.available_accelerators())
    expected = {"cpu", "cuda", "mps", "tpu"}
    # Note: the registry is global, other tests may register new strategies as a side effect
    assert expected.issubset(available)
