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TST: fix fortran IO test for big-endian architectures #4577

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merged 1 commit into from
Jul 17, 2023
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TST: fix fortran IO test for big-endian architectures #4577

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10 changes: 7 additions & 3 deletions yt/utilities/tests/test_cython_fortran_utils.py
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import struct

import numpy as np
import pytest

Expand All @@ -12,9 +14,11 @@ def test_raise_error_when_file_does_not_exist():
def test_read(tmp_path):
dummy_file = tmp_path / "test.bin"
# Write a Fortran-formatted file containing one record with 4 doubles
dummy_file.write_bytes(
b" \x00\x00\x00\x00\x00\x00\x00\x00\x00\xf0?\x00\x00\x00\x00\x00\x00\x00@\x00\x00\x00\x00\x00\x00\x08@\x00\x00\x00\x00\x00\x00\x10@ \x00\x00\x00"
)
# The format is a 32bit integer with value 4*sizeof(double)=32
# followed by 4 doubles and another 32bit integer with value 32
# Note that there is no memory alignment, hence the "=" below
buff = struct.pack("=i 4d i", 32, 1.0, 2.0, 3.0, 4.0, 32)
dummy_file.write_bytes(buff)
with FortranFile(str(dummy_file)) as f:
np.testing.assert_equal(
f.read_vector("d"),
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