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# Copyright (c) 2016, Science and Technology Facilities Council
# This software is distributed under a BSD licence. See LICENSE.txt.
"""
Tests for gzipmrcfile.py
"""
# Import Python 3 features for future-proofing
from __future__ import (absolute_import, division, print_function,
unicode_literals)
import os
import unittest
from . import test_mrcfile
from mrcfile.gzipmrcfile import GzipMrcFile
class GzipMrcFileTest(test_mrcfile.MrcFileTest):
"""Unit tests for gzipped MRC file I/O.
Note that this test class inherits MrcFileTest to ensure all of the tests
for MrcObject and MrcFile work correctly for the GzipMrcFile subclass.
"""
def setUp(self):
# Set up as if for MrcFileTest
super(GzipMrcFileTest, self).setUp()
# Replace test MRC files with their gzipped equivalents
self.example_mrc_name = os.path.join(self.test_data, 'emd_3197.map.gz')
self.ext_header_mrc_name = os.path.join(self.test_data, 'emd_3001.map.gz')
self.fei1_ext_header_mrc_name = os.path.join(self.test_data, 'fei-extended.mrc.gz')
self.fei2_ext_header_mrc_name = os.path.join(self.test_data, 'epu2.9_example.mrc.gz')
# Create .gz files from .mrc files if necessary
if not os.path.isfile(self.fei1_ext_header_mrc_name):
print("Test data file fei-extended.mrc.gz not found. Creating a new copy...")
fei1_ext_header_mrc_name = os.path.join(self.test_data, 'fei-extended.mrc')
import gzip
with open(fei1_ext_header_mrc_name, "rb") as mrc:
with gzip.open(self.fei1_ext_header_mrc_name, 'wb') as gzipf:
gzipf.write(mrc.read())
if not os.path.isfile(self.fei2_ext_header_mrc_name):
print("Test data file epu2.9_example.mrc.gz not found. Creating a new copy...")
fei2_ext_header_mrc_name = os.path.join(self.test_data, 'epu2.9_example.mrc')
import gzip
with open(fei2_ext_header_mrc_name, "rb") as mrc:
with gzip.open(self.fei2_ext_header_mrc_name, 'wb') as gzipf:
gzipf.write(mrc.read())
# Set the newmrc method to the GzipMrcFile constructor
self.newmrc = GzipMrcFile
# Set up parameters so MrcObject tests run on the GzipMrcFile class
obj_mrc_name = os.path.join(self.test_output, 'test_mrcobject.mrc')
self.mrcobject = GzipMrcFile(obj_mrc_name, 'w+', overwrite=True)
# Flush and re-read to ensure underlying file is valid gzip
self.mrcobject.flush()
self.mrcobject._read()
def test_non_mrc_file_is_rejected(self):
"""Override test to change expected error message."""
name = os.path.join(self.test_data, 'emd_3197.png')
with (self.assertRaisesRegex(IOError, 'Not a gzipped file')):
GzipMrcFile(name)
def test_non_mrc_file_gives_correct_warnings_in_permissive_mode(self):
"""Override test - permissive mode still can't read non-gzip files."""
name = os.path.join(self.test_data, 'emd_3197.png')
with (self.assertRaisesRegex(IOError, 'Not a gzipped file')):
GzipMrcFile(name, permissive=True)
def test_repr(self):
"""Override test to change expected repr string."""
with GzipMrcFile(self.example_mrc_name) as mrc:
assert repr(mrc) == "GzipMrcFile('{0}', mode='r')".format(self.example_mrc_name)
if __name__ == "__main__":
unittest.main()
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