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Test zero-size remote file reads #984

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15 changes: 14 additions & 1 deletion python/kvikio/tests/test_http_io.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
# SPDX-FileCopyrightText: Copyright (c) 2024-2025, NVIDIA CORPORATION. All rights reserved.
# SPDX-FileCopyrightText: Copyright (c) 2024-2026, NVIDIA CORPORATION. All rights reserved.
# SPDX-License-Identifier: Apache-2.0


Expand Down Expand Up @@ -174,6 +174,19 @@ def test_no_range_support(http_server, tmpdir, xp):
f.read(b, size=10, file_offset=10)


@pytest.mark.parametrize("http_server", [{"range_support": False}], indirect=True)
@pytest.mark.parametrize("file_offset", [0, 100])
def test_zero_size_read_returns_without_range_request(http_server, tmpdir, file_offset):
a = np.arange(100, dtype="uint8")
a.tofile(tmpdir / "a")
b = np.full(10, 42, dtype="uint8")

with kvikio.RemoteFile.open_http(f"{http_server}/a") as f:
assert f.read(b, size=0, file_offset=file_offset) == 0

np.testing.assert_array_equal(b, np.full_like(b, 42))


def test_retry_http_503_ok(tmpdir, xp):
a = xp.arange(100, dtype="uint8")
a.tofile(tmpdir / "a")
Expand Down