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#!/usr/bin/python
"""
Copyright 2013 Google Inc.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
Test imagediffdb.py
"""
# System-level imports
import logging
import shutil
import tempfile
import unittest
# Local imports
import imagediffdb
IMG_URL_BASE = 'http://chromium-skia-gm.commondatastorage.googleapis.com/gm/bitmap-64bitMD5/'
class ImageDiffDbTest(unittest.TestCase):
def setUp(self):
self._temp_dir = tempfile.mkdtemp()
self.maxDiff = None
def tearDown(self):
shutil.rmtree(self._temp_dir)
def shortDescription(self):
"""Tell unittest framework to not print docstrings for test cases."""
return None
def test_sanitize_locator(self):
"""Test _sanitize_locator()."""
self.assertEqual(imagediffdb._sanitize_locator('simple'), 'simple')
self.assertEqual(imagediffdb._sanitize_locator(1234), '1234')
self.assertEqual(imagediffdb._sanitize_locator('one/two'), 'one_two')
self.assertEqual(imagediffdb._sanitize_locator('one\\two'), 'one_two')
self.assertEqual(imagediffdb._sanitize_locator('one_two'), 'one_two')
def test_simple(self):
"""Test ImageDiffDB, downloading real known images from Google Storage.
TODO(epoger): Instead of hitting Google Storage, we should read image
files from local disk using a file:// IMG_URL_BASE.
"""
# params for each self-test:
# 0. expected image locator
# 1. expected image URL
# 2. actual image locator
# 3. actual image URL
# 4. expected percent_pixels_differing (as a string, to 4 decimal places)
# 5. expected weighted_diff_measure (as a string, to 4 decimal places)
# 6. expected max_diff_per_channel
selftests = [
[
'arcofzorro/16206093933823793653',
IMG_URL_BASE + 'arcofzorro/16206093933823793653.png',
'arcofzorro/13786535001616823825',
IMG_URL_BASE + 'arcofzorro/13786535001616823825.png',
'0.0662', '0.0113', [255, 255, 247],
],
[
'gradients_degenerate_2pt/10552995703607727960',
IMG_URL_BASE + 'gradients_degenerate_2pt/10552995703607727960.png',
'gradients_degenerate_2pt/11198253335583713230',
IMG_URL_BASE + 'gradients_degenerate_2pt/11198253335583713230.png',
'100.0000', '66.6667', [255, 0, 255],
],
]
# Add all image pairs to the database
db = imagediffdb.ImageDiffDB(self._temp_dir)
for selftest in selftests:
retval = db.add_image_pair(
expected_image_locator=selftest[0], expected_image_url=selftest[1],
actual_image_locator=selftest[2], actual_image_url=selftest[3])
# Fetch each image pair from the database
for selftest in selftests:
record = db.get_diff_record(expected_image_locator=selftest[0],
actual_image_locator=selftest[2])
self.assertEqual('%.4f' % record.get_percent_pixels_differing(),
selftest[4])
self.assertEqual('%.4f' % record.get_weighted_diff_measure(), selftest[5])
self.assertEqual(record.get_max_diff_per_channel(), selftest[6])
def main():
suite = unittest.TestLoader().loadTestsFromTestCase(ImageDiffDbTest)
unittest.TextTestRunner(verbosity=2).run(suite)
if __name__ == '__main__':
main()
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