def test_SparseFile_seek_whence_2(size):
from oniontree.sparsefile import SparseFile
sf = SparseFile(size=size)
for i in range(0, -(size + 1), -1):
sf.seek(i, 2)
assert len(sf.read()) == abs(i)
def test_SparseFile_seek(size):
from oniontree.sparsefile import SparseFile
sf = SparseFile(size=size)
for i in range(0, size):
sf.seek(i)
assert len(sf.read()) == size - i