def test_read1():
stream = CircularIO(10)
stream.write(b'abcdef')
stream.write(b'ghijklm')
stream.seek(0)
assert stream.read1() == b'def'
stream.seek(0)
assert stream.read1(5) == b'def'
assert stream.read1(3) == b'ghi'
assert stream.read1() == b'jklm'
assert stream.read1() == b''
def test_read1():
stream = CircularIO(10)
stream.write(b'abcdef')
# Circular buffer drops whole writes, so this will drop "abcdef"
stream.write(b'ghijklm')
stream.seek(0)
assert stream.read1() == b'ghijklm'
stream.seek(0)
assert stream.read1(5) == b'ghijk'
assert stream.read1(3) == b'lm'
assert stream.read1() == b''
