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"""
Test suite for openjpeg's callback functions.
"""
# Standard library imports ...
from io import StringIO
import warnings
import unittest
from unittest.mock import patch
# 3rd party library imports
import skimage
# Local imports ...
import glymur
from . import fixtures
@unittest.skipIf(
fixtures.OPENJPEG_NOT_AVAILABLE,
fixtures.OPENJPEG_NOT_AVAILABLE_MSG
)
class TestSuite(fixtures.TestCommon):
"""Test suite for callbacks."""
def test_info_callback_on_write_backwards_compatibility(self):
"""
SCENARIO: write to a J2K file while in verbose mode
EXPECTED RESULT: verify messages from the library
"""
j = glymur.Jp2k(self.jp2file)
with warnings.catch_warnings():
# Ignore a library warning.
warnings.simplefilter("ignore")
tiledata = j._read(tile=0)
with patch("sys.stdout", new=StringIO()) as fake_out:
glymur.Jp2k(self.temp_j2k_filename, data=tiledata, verbose=True)
actual = fake_out.getvalue().strip()
expected = "[INFO] tile number 1 / 1"
self.assertEqual(actual, expected)
def test_info_callback_on_write(self):
"""
SCENARIO: write to a JP2 file while in verbose mode
EXPECTED RESULT: verify messages from the library
"""
j = glymur.Jp2k(self.jp2file)
tiledata = j[:]
with patch("sys.stdout", new=StringIO()) as fake_out:
glymur.Jp2k(self.temp_jp2_filename, data=tiledata, verbose=True)
actual = fake_out.getvalue().strip()
expected = "[INFO] tile number 1 / 1"
self.assertEqual(actual, expected)
def test_info_callbacks_on_read(self):
"""
SCENARIO: the verbose attribute is set to True
EXPECTED RESULT: The info callback handler should be enabled. There
should be [INFO] output present in sys.stdout.
"""
jp2 = glymur.Jp2k(self.j2kfile)
with patch("sys.stdout", new=StringIO()) as fake_out:
jp2.verbose = True
jp2[::2, ::2]
actual = fake_out.getvalue().strip()
self.assertIn("[INFO]", actual)
def test_info_callbacks_on_writing_tiles(self):
"""
SCENARIO: the verbose attribute is set to True
EXPECTED RESULT: The info callback handler should be enabled. There
should be [INFO] output present in sys.stdout.
"""
jp2_data = skimage.data.moon()
shape = jp2_data.shape[0] * 3, jp2_data.shape[1] * 2
tilesize = (jp2_data.shape[0], jp2_data.shape[1])
j = glymur.Jp2k(
self.temp_jp2_filename,
shape=shape,
tilesize=tilesize,
verbose=True
)
with patch("sys.stdout", new=StringIO()) as fake_out:
for tw in j.get_tilewriters():
tw[:] = jp2_data
actual = fake_out.getvalue().strip()
self.assertIn("[INFO] tile number", actual)
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