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import io
import os
import unittest
from subprocess import STDOUT, CalledProcessError
from tempfile import NamedTemporaryFile
from unittest import TestCase, mock
from willow.optimizers import Cwebp, Gifsicle, Jpegoptim, Pngquant
from willow.optimizers.base import OptimizerBase
from willow.registry import WillowRegistry
class OptimizerTest(TestCase):
@classmethod
def setUpClass(cls) -> None:
class DummyOptimizer(OptimizerBase):
library_name = "dummy"
image_format = "FOO"
cls.DummyOptimizer = DummyOptimizer
def setUp(self) -> None:
self.registry = WillowRegistry()
@mock.patch("willow.optimizers.base.subprocess.check_output")
def test_check_library(self, mock_check_output):
self.assertTrue(self.DummyOptimizer.check_library())
@mock.patch("willow.optimizers.base.subprocess.check_output")
def test_check_library_fail(self, mock_check_output):
mock_check_output.side_effect = CalledProcessError(-1, "dummy")
self.assertFalse(self.DummyOptimizer.check_library())
mock_check_output.side_effect = FileNotFoundError
self.assertFalse(self.DummyOptimizer.check_library())
def test_applies_to(self):
self.assertTrue(self.DummyOptimizer.applies_to("foo"))
self.assertTrue(self.DummyOptimizer.applies_to("FOO"))
self.assertFalse(self.DummyOptimizer.applies_to("JPEG"))
def test_get_check_library_arguments(self):
self.assertEqual(self.DummyOptimizer.get_check_library_arguments(), ["--help"])
def test_get_command_arguments(self):
self.assertEqual(self.DummyOptimizer.get_command_arguments("file.png"), [])
@mock.patch("willow.optimizers.base.subprocess.check_output")
def test_process(self, mock_check_output):
self.DummyOptimizer.process("file.png")
mock_check_output.assert_called_once_with(["dummy"], stderr=STDOUT)
@mock.patch("willow.optimizers.base.subprocess.check_output")
def test_process_logs_any_issue(self, mock_check_output):
# Simulates a CalledProcessError and tests that we log the error
mock_check_output.side_effect = CalledProcessError(1, "dummy")
with self.assertLogs("willow", level="ERROR") as log_output:
self.DummyOptimizer.process("file.png")
self.assertIn(
"Error optimizing file.png with the 'dummy' library", log_output.output[0]
)
class DefaultOptimizerTestBase:
@classmethod
def setUpClass(cls) -> None:
with open(f"tests/images/optimizers/original.{cls.extension}", "rb") as f:
cls.original_size = os.fstat(f.fileno()).st_size
cls.original_image = f.read()
with open(f"tests/images/optimizers/optimized.{cls.extension}", "rb") as f:
f.seek(0, io.SEEK_END)
cls.optimized_size = os.fstat(f.fileno()).st_size
cls.optimized_image = f.read()
def test_process_optimizes_image(self):
try:
with NamedTemporaryFile(delete=False) as named_temporary_file:
named_temporary_file.write(self.original_image)
image_file = named_temporary_file.name
self.optimizer.process(image_file)
with open(image_file, "rb") as f:
self.assertAlmostEqual(
self.optimized_size, os.fstat(f.fileno()).st_size, delta=60
)
finally:
os.unlink(image_file)
@unittest.skipUnless(Gifsicle.check_library(), "gifsicle not installed")
class GifsicleOptimizer(DefaultOptimizerTestBase, TestCase):
extension = "gif"
optimizer = Gifsicle
def test_applies_to(self):
self.assertTrue(Gifsicle.applies_to("gif"))
for ext in ("png", "jpeg", "webp", "tiff", "bmp"):
self.assertFalse(Gifsicle.applies_to(ext))
def test_get_command_arguments(self):
self.assertListEqual(
Gifsicle.get_command_arguments("file.gif"), ["-b", "-O3", "file.gif"]
)
@unittest.skipUnless(Jpegoptim.check_library(), "jpegoptim not installed")
class JpegoptimOptimizer(DefaultOptimizerTestBase, TestCase):
extension = "jpg"
optimizer = Jpegoptim
def test_applies_to(self):
self.assertTrue(Jpegoptim.applies_to("jpeg"))
for ext in ("png", "gif", "webp", "tiff", "bmp"):
self.assertFalse(Jpegoptim.applies_to(ext))
def test_get_command_arguments(self):
self.assertListEqual(
Jpegoptim.get_command_arguments("file.jpg"),
["--strip-all", "--max=85", "--all-progressive", "file.jpg"],
)
@unittest.skipUnless(Pngquant.check_library(), "pngquant not installed")
class PngquantOptimizer(DefaultOptimizerTestBase, TestCase):
extension = "png"
optimizer = Pngquant
def test_applies_to(self):
self.assertTrue(Pngquant.applies_to("png"))
for ext in ("gif", "jpeg", "webp", "tiff", "bmp"):
self.assertFalse(Pngquant.applies_to(ext))
def test_get_command_arguments(self):
self.assertListEqual(
Pngquant.get_command_arguments("file.png"),
[
"--force",
"--strip",
"--skip-if-larger",
"file.png",
"--output",
"file.png",
],
)
@unittest.skipUnless(Cwebp.check_library(), "cwebp not installed")
class CwebpOptimizer(DefaultOptimizerTestBase, TestCase):
extension = "webp"
optimizer = Cwebp
def test_applies_to(self):
self.assertTrue(Cwebp.applies_to("webp"))
for ext in ("png", "jpeg", "gif", "tiff", "bmp"):
self.assertFalse(Cwebp.applies_to(ext))
def test_get_command_arguments(self):
self.assertListEqual(
Cwebp.get_command_arguments("file.webp"),
[
"-m",
"6",
"-mt",
"-pass",
"10",
"-q",
"75",
"file.webp",
"-o",
"file.webp",
],
)
def get_check_library_command_arguments(self):
self.assertListEqual(
Cwebp.get_check_library_arguments(),
[],
)
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