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import gc
import pytest
from asdf._block.callback import DataCallback
from asdf._block.manager import ReadBlocks
def test_default_attribute():
class Data:
def __init__(self, value):
self.data = value
blks = ReadBlocks([Data("a"), Data("b")])
cbs = [DataCallback(0, blks), DataCallback(1, blks)]
assert cbs[0]() == "a"
assert cbs[1]() == "b"
def test_attribute_access():
class Foo:
def __init__(self, attr, value):
setattr(self, attr, value)
blks = ReadBlocks([Foo("a", "foo"), Foo("a", "bar")])
cb = DataCallback(0, blks)
assert cb(_attr="a") == "foo"
def test_weakref():
class Data:
def __init__(self, value):
self.data = value
blks = ReadBlocks([Data("a"), Data("b")])
cb = DataCallback(0, blks)
del blks
gc.collect(2)
with pytest.raises(OSError, match="Attempt to read block data from missing block"):
cb()
def test_reassign():
class Data:
def __init__(self, value):
self.data = value
blks = ReadBlocks([Data("a"), Data("b")])
cb = DataCallback(0, blks)
assert cb() == "a"
blks2 = ReadBlocks([Data("c"), Data("d")])
cb._reassign(1, blks2)
assert cb() == "d"
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