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import pytest
from focaccia.snapshot import SparseMemory, MemoryAccessError
@pytest.fixture
def mem():
return SparseMemory()
def test_oob_read(mem):
for addr in range(mem.page_size):
with pytest.raises(MemoryAccessError):
mem.read(addr, 1)
with pytest.raises(MemoryAccessError):
mem.read(addr, 30)
with pytest.raises(MemoryAccessError):
mem.read(addr + 0x10, 30)
with pytest.raises(MemoryAccessError):
mem.read(addr, mem.page_size)
with pytest.raises(MemoryAccessError):
mem.read(addr, mem.page_size - 1)
with pytest.raises(MemoryAccessError):
mem.read(addr, mem.page_size + 1)
def test_basic_read_write(mem):
data = b'a' * mem.page_size * 2
mem.write(0x300, data)
assert mem.read(0x300, len(data)) == data
assert mem.read(0x300, 1) == b'a'
assert mem.read(0x400, 1) == b'a'
assert mem.read(0x299 + mem.page_size * 2, 1) == b'a'
assert mem.read(0x321, 12) == b'aaaaaaaaaaaa'
mem.write(0x321, b'Hello World!')
assert mem.read(0x321, 12) == b'Hello World!'
with pytest.raises(MemoryAccessError):
mem.read(0x300, mem.page_size * 3)
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