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TST: add a test for torch.argsort defaulting to stable=True #358

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Oct 28, 2025
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TST: add a test for torch.argsort defaulting to stable=True #358

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10 changes: 10 additions & 0 deletions tests/test_torch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -130,3 +130,13 @@ def test_meshgrid():
assert Y.shape == Y_ij.shape
assert xp.all(Y == Y_ij)


def test_argsort_stable():
"""Verify that argsort defaults to a stable sort."""
# Bare pytorch defaults to an unstable sort, and the array_api_compat wrapper
# enforces the stable=True default.
# cf https://github.com/data-apis/array-api-compat/pull/356 and
# https://github.com/data-apis/array-api-tests/pull/390#issuecomment-3452868329

t = xp.zeros(50) # should be >16
assert xp.all(xp.argsort(t) == xp.arange(50))
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