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# encoding: utf-8
"""
Test suite for docx.image.helpers module
"""
from __future__ import absolute_import, print_function
import pytest
from docx.compat import BytesIO
from docx.image.exceptions import UnexpectedEndOfFileError
from docx.image.helpers import BIG_ENDIAN, LITTLE_ENDIAN, StreamReader
class DescribeStreamReader(object):
def it_can_read_a_string_of_specified_len_at_offset(
self, read_str_fixture):
stream_rdr, expected_string = read_str_fixture
s = stream_rdr.read_str(6, 2)
assert s == 'foobar'
def it_raises_on_unexpected_EOF(self, read_str_fixture):
stream_rdr = read_str_fixture[0]
with pytest.raises(UnexpectedEndOfFileError):
stream_rdr.read_str(9, 2)
def it_can_read_a_long(self, read_long_fixture):
stream_rdr, offset, expected_int = read_long_fixture
long_ = stream_rdr.read_long(offset)
assert long_ == expected_int
# fixtures -------------------------------------------------------
@pytest.fixture(params=[
(BIG_ENDIAN, b'\xBE\x00\x00\x00\x2A\xEF', 1, 42),
(LITTLE_ENDIAN, b'\xBE\xEF\x2A\x00\x00\x00', 2, 42),
])
def read_long_fixture(self, request):
byte_order, bytes_, offset, expected_int = request.param
stream = BytesIO(bytes_)
stream_rdr = StreamReader(stream, byte_order)
return stream_rdr, offset, expected_int
@pytest.fixture
def read_str_fixture(self):
stream = BytesIO(b'\x01\x02foobar\x03\x04')
stream_rdr = StreamReader(stream, BIG_ENDIAN)
expected_string = 'foobar'
return stream_rdr, expected_string
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