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#!/usr/bin/env python
import io
from iterableio import RawIterableReader, open_iterable
import pytest
@pytest.mark.parametrize("mode, buffering, encoding, errors, newline",[
# bad modes
("", -1, None, None, None),
("abc", -1, None, None, None),
("rtb", -1, None, None, None),
("rt", 0, None, None, None), # need buffering
("rt", "bad int", None, None, None), # invalid buffering int
# can't provide text decoding params in binary mode
("rb", 0, "utf-8", None, None),
("rb", 0, None, "ignore", None),
("rb", 0, None, None, "\n"),
])
def test_invalid_input(mode, buffering, encoding, errors, newline):
"""Test that invalid params are caught"""
with pytest.raises((ValueError, TypeError, LookupError)):
open_iterable([], mode, buffering, encoding, errors, newline)
@pytest.mark.parametrize("buffering", (0, -1, 1))
def test_reading(buffering):
def gen():
yield from (
b'\x01\x02\x03\x04\x05',
b"abcde",
b"fghij",
b"klmno",
b"qrstu",
b"vwxyz",
b'\x06\x07\x08\x09\x10',
)
_data = b"".join(gen())
with open_iterable(gen(), "rb", buffering=buffering) as i:
assert i.readable()
assert not i.seekable()
assert not i.writable()
cnt = 0
for amt in (0, 1, 2, 3, 4, 5, 10, 1, 1, 0):
d = i.read(amt)
assert len(d) == amt
assert d == _data[cnt:cnt+amt]
cnt += amt
assert i.tell() == cnt
assert i.read() == _data[cnt:]
assert i.read() == b""
assert i.tell() == len(_data)
def test_returned_class():
"""Test that the correct class is returned depending on the mode and buffering spec"""
assert isinstance(open_iterable([], "rb", buffering=0), RawIterableReader)
assert isinstance(open_iterable([], "rb", buffering=-1), io.BufferedReader)
assert isinstance(open_iterable([], "rb", buffering=1), io.BufferedReader)
assert isinstance(open_iterable([], "rt", buffering=-1), io.TextIOWrapper)
assert isinstance(open_iterable([], "rt", buffering=1), io.TextIOWrapper)
@pytest.mark.parametrize("mode, buffering",[
("rb", 0),
("rb", -1),
("rt", -1),
])
def test_contextmgr_close(mode, buffering):
with open_iterable([], mode, buffering) as i:
assert not i.closed
assert i.closed
@pytest.mark.parametrize("mode, buffering",[
("rb", 0),
("rb", -1),
("rt", -1),
])
def test_unreadable_after_close(mode, buffering):
i = open_iterable([b"12345"], mode, buffering)
assert not i.read(0)
assert i.read(1) in (b"1", "1")
assert not i.closed
i.close()
assert i.closed
with pytest.raises(ValueError, match="closed"):
i.read()
with pytest.raises(ValueError, match="closed"):
i.tell()
def test_yield_empty_bytes():
"""Test that a generator is only 'done' when it stops yielding, not when it yields empty bytes"""
def gen():
yield from (
b"1",
b"", b"", b"", b"", b"", b"", b"",
b"2", b"3",
b"", b"", b"", b"", b"", b"",
b"4",
)
i = RawIterableReader(gen())
out = []
while True:
b = i.read(1)
if not b:
break
out.append(b)
assert len(out) == 4
assert b"".join(out) == b"1234"
def test_read_text():
def gen():
# 9 lines yielded in non-line chunks
yield from (
x.encode("utf-8") for x in (
"this is a line\n",
"",
"",
"_a",
"another line\n",
"another line1\n",
"another line2\n",
"another line_",
"a",
"aaaaaaa\nbbbbbbbb",
"_",
"1",
"2",
"3",
"4",
"5",
"_line line line another line actually\n",
"another line\n",
"ending line\n",
"actual ending line no trailing newline",
)
)
real = "".join(x.decode("utf-8") for x in gen())
# read across chunks and lines
with open_iterable(gen(), encoding="utf-8") as i:
assert i.read(10) == real[:10]
assert i.read(10) == real[10:20]
with open_iterable(gen(), encoding="utf-8") as i:
lines = list(i)
with open_iterable(gen(), encoding="utf-8") as i:
assert lines == i.readlines()
assert len(lines) == len(real.splitlines()) == 9
assert "".join(lines) == real
|
