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import unittest
from pathlib import Path
try:
from unittest.mock import call, patch
except ImportError:
# Python 2
from mock import call, patch
import numpy as np
from PIL import Image
try:
import cv2
except ImportError:
cv2 = None
try:
import imageio
except ImportError:
imageio = None
from pylibdmtx.pylibdmtx import (
decode, encode, Decoded, Encoded, Rect, EXTERNAL_DEPENDENCIES
)
from pylibdmtx.pylibdmtx_error import PyLibDMTXError
TESTDATA = Path(__file__).parent
class TestDecode(unittest.TestCase):
EXPECTED = [
Decoded(
data=b'Stegosaurus',
rect=Rect(left=5, top=6, width=96, height=95)
),
Decoded(
data=b'Plesiosaurus',
rect=Rect(left=298, top=6, width=95, height=95)
)
]
@classmethod
def setUpClass(cls):
cls.datamatrix = Image.open(str(TESTDATA.joinpath('datamatrix.png')))
cls.empty = Image.open(str(TESTDATA.joinpath('empty.png')))
# assertRaisesRegexp was a deprecated alias removed in Python 3.11
if not hasattr(cls, 'assertRaisesRegex'):
cls.assertRaisesRegex = cls.assertRaisesRegexp
@classmethod
def tearDownClass(cls):
cls.datamatrix = cls.empty = None
def test_decode(self):
"Read both barcodes in `datamatrix.png`"
res = decode(self.datamatrix)
self.assertEqual(self.EXPECTED, res)
def test_decode_single(self):
"Read just one of the barcodes in `datamatrix.png`"
res = decode(self.datamatrix, max_count=1)
self.assertEqual(self.EXPECTED[:1], res)
def test_decode_tuple(self):
"Read barcodes in pixels"
pixels = self.datamatrix.copy().convert('RGB').tobytes()
width, height = self.datamatrix.size[:2]
res = decode((pixels, width, height))
self.assertEqual(self.EXPECTED, res)
def test_empty(self):
"Do not show any output for an image that does not contain a barcode"
res = decode(self.empty)
self.assertEqual([], res)
def test_decode_numpy(self):
"Read image using Pillow and convert to numpy.ndarray"
res = decode(np.asarray(self.datamatrix))
self.assertEqual(self.EXPECTED, res)
@unittest.skipIf(imageio is None, 'imageio not installed')
def test_decode_imageio(self):
"Read image using imageio"
res = decode(imageio.imread(TESTDATA.joinpath('datamatrix.png')))
self.assertEqual(self.EXPECTED, res)
@unittest.skipIf(cv2 is None, 'OpenCV not installed')
def test_decode_opencv(self):
"Read image using OpenCV"
res = decode(cv2.imread(str(TESTDATA.joinpath('datamatrix.png'))))
self.assertEqual(self.EXPECTED, res)
def test_external_dependencies(self):
"External dependencies"
self.assertEqual(1, len(EXTERNAL_DEPENDENCIES))
self.assertIn('libdmtx', EXTERNAL_DEPENDENCIES[0]._name)
@patch('pylibdmtx.pylibdmtx.dmtxImageCreate')
def test_dmtxImageCreate_failed(self, dmtxImageCreate):
dmtxImageCreate.return_value = None
self.assertRaisesRegex(
PyLibDMTXError, 'Could not create image', decode, self.datamatrix
)
self.assertEqual(1, dmtxImageCreate.call_count)
@patch('pylibdmtx.pylibdmtx.dmtxDecodeCreate')
def test_dmtxDecodeCreate_failed(self, dmtxDecodeCreate):
dmtxDecodeCreate.return_value = None
self.assertRaisesRegex(
PyLibDMTXError, 'Could not create decoder', decode, self.datamatrix
)
self.assertEqual(1, dmtxDecodeCreate.call_count)
def test_unsupported_bits_per_pixel(self):
# 40 bits-per-pixel
data = (list(range(3 * 3 * 5)), 3, 3)
self.assertRaisesRegex(
PyLibDMTXError,
(
r'Unsupported bits-per-pixel: \[40\] Should be one of '
r'\[8, 16, 24, 32\]'
),
decode, data
)
def test_inconsistent_dimensions(self):
# Image data has ten bytes. width x height indicates nine bytes
data = (list(range(10)), 3, 3)
self.assertRaisesRegex(
PyLibDMTXError,
(
r'Inconsistent dimensions: image data of 10 bytes is not '
r'divisible by \(width x height = 9\)'
),
decode, data
)
class TestEncode(unittest.TestCase):
@classmethod
def setUpClass(cls):
# assertRaisesRegexp was a deprecated alias removed in Python 3.11
if not hasattr(cls, 'assertRaisesRegex'):
cls.assertRaisesRegex = cls.assertRaisesRegexp
def _assert_encoded_data(self, expected_data, encoded):
# Check encoded data
image = Image.frombytes(
'RGB', (encoded.width, encoded.height), encoded.pixels
)
decoded = decode(image)
self.assertEqual(1, len(decoded))
self.assertEqual(expected_data, decoded[0].data)
def test_encode_defaults(self):
data = b'hello world'
encoded = encode(data)
# Check returned data, with the exception of the pixel data
self.assertEqual(
Encoded(width=100, height=100, bpp=24, pixels=None),
encoded._replace(pixels=None)
)
self._assert_encoded_data(data, encoded)
def test_encode_size(self):
data = b'hello world'
encoded = encode(data, size='36x36')
# Check returned data, with the exception of the pixel data
self.assertEqual(
Encoded(width=200, height=200, bpp=24, pixels=None),
encoded._replace(pixels=None)
)
self._assert_encoded_data(data, encoded)
def test_encode_scheme(self):
data = b'hello world'
encoded = encode(data, scheme='Base256')
# Check returned data, with the exception of the pixel data
self.assertEqual(
Encoded(width=110, height=110, bpp=24, pixels=None),
encoded._replace(pixels=None)
)
self._assert_encoded_data(data, encoded)
def test_invalid_scheme(self):
self.assertRaisesRegex(
PyLibDMTXError,
r"Invalid scheme \[asdf\]: should be one of \['Ascii",
encode, b' ', scheme='asdf'
)
def test_invalid_size(self):
self.assertRaisesRegex(
PyLibDMTXError,
r"Invalid size \[9x9\]: should be one of \['RectAuto'",
encode, b' ', size='9x9'
)
def test_image_not_large_enough(self):
self.assertRaisesRegex(
PyLibDMTXError,
'Could not encode data, possibly because the image is not '
'large enough to contain the data',
encode, b' '*50, size='10x10'
)
if __name__ == '__main__':
unittest.main()
|
