Use fixture to re-open image for each test

Tests/test_file_jpeg2k.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import os
 import re
+from collections.abc import Generator
 from io import BytesIO
 from pathlib import Path
 from typing import Any
@@ -29,8 +30,16 @@ EXTRA_DIR = "Tests/images/jpeg2000"
 
 pytestmark = skip_unless_feature("jpg_2000")
 
-test_card = Image.open("Tests/images/test-card.png")
+
-test_card.load()
+@pytest.fixture
+def test_card() -> Generator[ImageFile.ImageFile, None, None]:
+    with Image.open("Tests/images/test-card.png") as im:
+        im.load()
+    try:
+        yield im
+    finally:
+        im.close()
+
 
 # OpenJPEG 2.0.0 outputs this debugging message sometimes; we should
 # ignore it---it doesn't represent a test failure.
@@ -74,7 +83,7 @@ def test_invalid_file() -> None:
         Jpeg2KImagePlugin.Jpeg2KImageFile(invalid_file)
 
 
-def test_bytesio() -> None:
+def test_bytesio(test_card: ImageFile.ImageFile) -> None:
     with open("Tests/images/test-card-lossless.jp2", "rb") as f:
         data = BytesIO(f.read())
     with Image.open(data) as im:
@@ -86,7 +95,7 @@ def test_bytesio() -> None:
 # PIL (they were made using Adobe Photoshop)
 
 
-def test_lossless(tmp_path: Path) -> None:
+def test_lossless(test_card: ImageFile.ImageFile, tmp_path: Path) -> None:
     with Image.open("Tests/images/test-card-lossless.jp2") as im:
         im.load()
         outfile = str(tmp_path / "temp_test-card.png")
@@ -94,54 +103,56 @@ def test_lossless(tmp_path: Path) -> None:
     assert_image_similar(im, test_card, 1.0e-3)
 
 
-def test_lossy_tiled() -> None:
+def test_lossy_tiled(test_card: ImageFile.ImageFile) -> None:
     assert_image_similar_tofile(
         test_card, "Tests/images/test-card-lossy-tiled.jp2", 2.0
     )
 
 
-def test_lossless_rt() -> None:
+def test_lossless_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card)
     assert_image_equal(im, test_card)
 
 
-def test_lossy_rt() -> None:
+def test_lossy_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card, quality_layers=[20])
     assert_image_similar(im, test_card, 2.0)
 
 
-def test_tiled_rt() -> None:
+def test_tiled_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card, tile_size=(128, 128))
     assert_image_equal(im, test_card)
 
 
-def test_tiled_offset_rt() -> None:
+def test_tiled_offset_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card, tile_size=(128, 128), tile_offset=(0, 0), offset=(32, 32))
     assert_image_equal(im, test_card)
 
 
-def test_tiled_offset_too_small() -> None:
+def test_tiled_offset_too_small(test_card: ImageFile.ImageFile) -> None:
     with pytest.raises(ValueError):
         roundtrip(test_card, tile_size=(128, 128), tile_offset=(0, 0), offset=(128, 32))
 
 
-def test_irreversible_rt() -> None:
+def test_irreversible_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card, irreversible=True, quality_layers=[20])
     assert_image_similar(im, test_card, 2.0)
 
 
-def test_prog_qual_rt() -> None:
+def test_prog_qual_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card, quality_layers=[60, 40, 20], progression="LRCP")
     assert_image_similar(im, test_card, 2.0)
 
 
-def test_prog_res_rt() -> None:
+def test_prog_res_rt(test_card: ImageFile.ImageFile) -> None:
     im = roundtrip(test_card, num_resolutions=8, progression="RLCP")
     assert_image_equal(im, test_card)
 
 
 @pytest.mark.parametrize("num_resolutions", range(2, 6))
-def test_default_num_resolutions(num_resolutions: int) -> None:
+def test_default_num_resolutions(
+    test_card: ImageFile.ImageFile, num_resolutions: int
+) -> None:
     d = 1 << (num_resolutions - 1)
     im = test_card.resize((d - 1, d - 1))
     with pytest.raises(OSError):
@@ -205,7 +216,7 @@ def test_header_errors() -> None:
             pass
 
 
-def test_layers_type(tmp_path: Path) -> None:
+def test_layers_type(test_card: ImageFile.ImageFile, tmp_path: Path) -> None:
     outfile = str(tmp_path / "temp_layers.jp2")
     for quality_layers in [[100, 50, 10], (100, 50, 10), None]:
         test_card.save(outfile, quality_layers=quality_layers)
@@ -215,7 +226,7 @@ def test_layers_type(tmp_path: Path) -> None:
             test_card.save(outfile, quality_layers=quality_layers_str)
 
 
-def test_layers() -> None:
+def test_layers(test_card: ImageFile.ImageFile) -> None:
     out = BytesIO()
     test_card.save(out, "JPEG2000", quality_layers=[100, 50, 10], progression="LRCP")
     out.seek(0)
@@ -245,7 +256,13 @@ def test_layers() -> None:
         (None, {"no_jp2": False}, 4, b"jP"),
     ),
 )
-def test_no_jp2(name: str, args: dict[str, bool], offset: int, data: bytes) -> None:
+def test_no_jp2(
+    test_card: ImageFile.ImageFile,
+    name: str,
+    args: dict[str, bool],
+    offset: int,
+    data: bytes,
+) -> None:
     out = BytesIO()
     if name:
         out.name = name
@@ -254,7 +271,7 @@ def test_no_jp2(name: str, args: dict[str, bool], offset: int, data: bytes) -> N
     assert out.read(2) == data
 
 
-def test_mct() -> None:
+def test_mct(test_card: ImageFile.ImageFile) -> None:
     # Three component
     for val in (0, 1):
         out = BytesIO()
@@ -419,7 +436,7 @@ def test_comment() -> None:
             pass
 
 
-def test_save_comment() -> None:
+def test_save_comment(test_card: ImageFile.ImageFile) -> None:
     for comment in ("Created by Pillow", b"Created by Pillow"):
         out = BytesIO()
         test_card.save(out, "JPEG2000", comment=comment)
@@ -457,7 +474,7 @@ def test_crashes(test_file: str) -> None:
 
 
 @skip_unless_feature_version("jpg_2000", "2.4.0")
-def test_plt_marker() -> None:
+def test_plt_marker(test_card: ImageFile.ImageFile) -> None:
     # Search the start of the codesteam for PLT
     out = BytesIO()
     test_card.save(out, "JPEG2000", no_jp2=True, plt=True)