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from __future__ import annotations
from io import BytesIO
from pathlib import Path
from typing import IO
import pytest
from PIL import Hdf5StubImagePlugin, Image, ImageFile
TEST_FILE = "Tests/images/hdf5.h5"
def test_open() -> None:
# Act
with Image.open(TEST_FILE) as im:
# Assert
assert im.format == "HDF5"
# Dummy data from the stub
assert im.mode == "F"
assert im.size == (1, 1)
def test_invalid_file() -> None:
# Arrange
invalid_file = "Tests/images/flower.jpg"
# Act / Assert
with pytest.raises(SyntaxError):
Hdf5StubImagePlugin.HDF5StubImageFile(invalid_file)
def test_load() -> None:
# Arrange
with Image.open(TEST_FILE) as im:
# Act / Assert: stub cannot load without an implemented handler
with pytest.raises(OSError):
im.load()
def test_save() -> None:
# Arrange
with Image.open(TEST_FILE) as im:
dummy_fp = BytesIO()
dummy_filename = "dummy.h5"
# Act / Assert: stub cannot save without an implemented handler
with pytest.raises(OSError):
im.save(dummy_filename)
with pytest.raises(OSError):
Hdf5StubImagePlugin._save(im, dummy_fp, dummy_filename)
def test_handler(tmp_path: Path) -> None:
class TestHandler(ImageFile.StubHandler):
opened = False
loaded = False
saved = False
def open(self, im: Image.Image) -> None:
self.opened = True
def load(self, im: Image.Image) -> Image.Image:
self.loaded = True
im.fp.close()
return Image.new("RGB", (1, 1))
def is_loaded(self) -> bool:
return self.loaded
def save(self, im: Image.Image, fp: IO[bytes], filename: str) -> None:
self.saved = True
handler = TestHandler()
Hdf5StubImagePlugin.register_handler(handler)
with Image.open(TEST_FILE) as im:
assert handler.opened
assert not handler.is_loaded()
im.load()
assert handler.is_loaded()
temp_file = tmp_path / "temp.h5"
im.save(temp_file)
assert handler.saved
Hdf5StubImagePlugin.register_handler(None)
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