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import os
import numpy as np
import asdf
def test_rewrite_file_with_unaccessed_external_blocks_fails(tmp_path):
"""
Rewriting a file with external blocks fails if arrays are not first accessed
https://github.com/asdf-format/asdf/issues/1526
"""
arrs = [np.arange(3) + i for i in range(3)]
af = asdf.AsdfFile({"arrs": arrs})
[af.set_array_storage(a, "external") for a in arrs]
dns = []
for i in range(2):
dn = tmp_path / f"d{i}"
if not os.path.exists(dn):
os.makedirs(dn)
dns.append(dn)
fns = [dn / "test.asdf" for dn in dns]
# write to d0
af.write_to(fns[0])
with asdf.open(fns[0]) as af2:
af2["arrs"][0] = 42
# write to d1
af2.write_to(fns[1])
assert len(os.listdir(dns[0])) == 4
assert len(os.listdir(dns[1])) == 3
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