Merge pull request matplotlib#222 from ConorMacBride/fix-unclosed-tes…

…t-files

Fix unclosed test files

tests/test_default_tolerance.py

@@ -9,11 +9,11 @@
 @pytest.fixture(scope="module")
 def baseline_image(tmp_path_factory):
     path = Path(__file__).parent / "baseline" / "2.0.x" / f"{TEST_NAME}.png"
-    image = Image.open(path)
-    draw = ImageDraw.Draw(image)
-    draw.rectangle(((0, 0), (100, 100)), fill="red")
-    output = tmp_path_factory.mktemp("data") / f"{TEST_NAME}.png"
-    image.save(output)
+    with Image.open(path) as image:
+        draw = ImageDraw.Draw(image)
+        draw.rectangle(((0, 0), (100, 100)), fill="red")
+        output = tmp_path_factory.mktemp("data") / f"{TEST_NAME}.png"
+        image.save(output)
     return output
 
 

tests/test_deterministic.py

@@ -113,7 +113,8 @@ def test_mpl():
                 assert key_in_file
 
     else:  # "eps" or "png"
-        actual_metadata = Image.open(str(baseline_image)).info
+        with Image.open(str(baseline_image)) as image:
+            actual_metadata = image.info
         for k, expected in deterministic_metadata.items():
             actual = actual_metadata.get(k, None)
             if success_expected:  # metadata keys should not be in the file