async def test_open_inexisting_file_for_read_should_fail():
fs = MemProtocol()
fs.tree = {'/': {'tmp': {'xxx': {}, 'a.txt': b'data data data'}}}
with pytest.raises(FileNotFoundError):
async with fs.open('/tmp/b.txt'):
pass
async def test_closed_file_changes_fs():
fs = MemProtocol()
fs.tree = {'/': {'tmp': {'xxx': {}, 'a.txt': b'data data data'}}}
async with fs.open('/tmp/a.txt', mode='w') as f:
f.write('TEST TEST TEST')
assert fs.tree['/']['tmp']['a.txt'] == b'TEST TEST TEST'
async def test_open_existing_file_for_read():
fs = MemProtocol()
fs.tree = {'/': {'tmp': {'xxx': {}, 'a.txt': b'data data data'}}}
async with fs.open('/tmp/a.txt') as f:
assert f.read() == 'data data data'
