def test_read():
f = BlobIO(b'test' * 1000)
assert f.read(6) == b'testte'
assert f.tell() == 6
assert f.read(6) == b'sttest'
assert f.tell() == 12
def test_seek():
f = BlobIO(b'test' * 1000)
assert f.tell() == 0
f.seek(0, 2)
assert f.tell() == 4000
f.seek(-10, 2)
assert f.tell() == 3990
f.seek(-1, 1)
assert f.tell() == 3989
f.seek(-10000, 1)
assert f.tell() == 0
f.seek(1000, 0)
assert f.tell() == 1000
f.seek(2000, 0)
assert f.tell() == 2000
f.seek(3000)
assert f.tell() == 3000
f.seek(4000, 4)
assert f.tell() == 4000
def test_out_of_bounds_read():
f = BlobIO(b'test' * 1000)
f.seek(3998)
assert f.read(10) == b'st'
assert f.tell() == 4000
assert f.read(10) == b''
assert f.tell() == 4000
f.seek(5000)
assert f.read(10) == b''
def test_read_all():
f = BlobIO(b'test' * 3)
assert f.read() == b'testtesttest'
assert f.tell() == 12
assert f.read() == b''
f.seek(6)
assert f.read() == b'sttest'