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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import numpy as np # noqa: F401
import pytest
import awkward as ak
from awkward._backends.numpy import NumpyBackend
from awkward._backends.typetracer import TypeTracerBackend
def test():
layout = ak.to_layout({"x": 1, "y": 1})
assert ak.backend(layout) == "cpu"
assert layout.backend is NumpyBackend.instance()
layout_tt = layout.to_backend("typetracer")
assert ak.backend(layout_tt) == "typetracer"
assert layout_tt.backend is TypeTracerBackend.instance()
with pytest.raises(TypeError):
layout_tt.to_backend("cpu")
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