Fix Name field length when saving IM images

Tests/test_file_bmp.py

@@ -1,128 +1,139 @@
 import io
 
+import pytest
 from PIL import BmpImagePlugin, Image
 
-from .helper import PillowTestCase, assert_image_equal, hopper
+from .helper import assert_image_equal, hopper
 
 
-class TestFileBmp(PillowTestCase):
-    def roundtrip(self, im):
-        outfile = self.tempfile("temp.bmp")
+def test_sanity(tmp_path):
+    def roundtrip(im):
+        outfile = str(tmp_path / "temp.bmp")
 
         im.save(outfile, "BMP")
 
         with Image.open(outfile) as reloaded:
             reloaded.load()
-            self.assertEqual(im.mode, reloaded.mode)
-            self.assertEqual(im.size, reloaded.size)
-            self.assertEqual(reloaded.format, "BMP")
-            self.assertEqual(reloaded.get_format_mimetype(), "image/bmp")
-
-    def test_sanity(self):
-        self.roundtrip(hopper())
-
-        self.roundtrip(hopper("1"))
-        self.roundtrip(hopper("L"))
-        self.roundtrip(hopper("P"))
-        self.roundtrip(hopper("RGB"))
-
-    def test_invalid_file(self):
-        with open("Tests/images/flower.jpg", "rb") as fp:
-            self.assertRaises(SyntaxError, BmpImagePlugin.BmpImageFile, fp)
-
-    def test_save_to_bytes(self):
-        output = io.BytesIO()
-        im = hopper()
-        im.save(output, "BMP")
-
-        output.seek(0)
-        with Image.open(output) as reloaded:
-            self.assertEqual(im.mode, reloaded.mode)
-            self.assertEqual(im.size, reloaded.size)
-            self.assertEqual(reloaded.format, "BMP")
-
-    def test_save_too_large(self):
-        outfile = self.tempfile("temp.bmp")
-        with Image.new("RGB", (1, 1)) as im:
-            im._size = (37838, 37838)
-            with self.assertRaises(ValueError):
-                im.save(outfile)
-
-    def test_dpi(self):
-        dpi = (72, 72)
-
-        output = io.BytesIO()
-        with hopper() as im:
-            im.save(output, "BMP", dpi=dpi)
-
-        output.seek(0)
-        with Image.open(output) as reloaded:
-            self.assertEqual(reloaded.info["dpi"], dpi)
-
-    def test_save_bmp_with_dpi(self):
-        # Test for #1301
-        # Arrange
-        outfile = self.tempfile("temp.jpg")
-        with Image.open("Tests/images/hopper.bmp") as im:
-
-            # Act
-            im.save(outfile, "JPEG", dpi=im.info["dpi"])
-
-            # Assert
-            with Image.open(outfile) as reloaded:
-                reloaded.load()
-                self.assertEqual(im.info["dpi"], reloaded.info["dpi"])
-                self.assertEqual(im.size, reloaded.size)
-                self.assertEqual(reloaded.format, "JPEG")
-
-    def test_load_dpi_rounding(self):
-        # Round up
-        with Image.open("Tests/images/hopper.bmp") as im:
-            self.assertEqual(im.info["dpi"], (96, 96))
-
-        # Round down
-        with Image.open("Tests/images/hopper_roundDown.bmp") as im:
-            self.assertEqual(im.info["dpi"], (72, 72))
-
-    def test_save_dpi_rounding(self):
-        outfile = self.tempfile("temp.bmp")
-        with Image.open("Tests/images/hopper.bmp") as im:
-            im.save(outfile, dpi=(72.2, 72.2))
-            with Image.open(outfile) as reloaded:
-                self.assertEqual(reloaded.info["dpi"], (72, 72))
-
-            im.save(outfile, dpi=(72.8, 72.8))
-        with Image.open(outfile) as reloaded:
-            self.assertEqual(reloaded.info["dpi"], (73, 73))
+            assert im.mode == reloaded.mode
+            assert im.size == reloaded.size
+            assert reloaded.format == "BMP"
+            assert reloaded.get_format_mimetype() == "image/bmp"
+
+    roundtrip(hopper())
+
+    roundtrip(hopper("1"))
+    roundtrip(hopper("L"))
+    roundtrip(hopper("P"))
+    roundtrip(hopper("RGB"))
+
 
-    def test_load_dib(self):
-        # test for #1293, Imagegrab returning Unsupported Bitfields Format
-        with Image.open("Tests/images/clipboard.dib") as im:
-            self.assertEqual(im.format, "DIB")
-            self.assertEqual(im.get_format_mimetype(), "image/bmp")
+def test_invalid_file():
+    with open("Tests/images/flower.jpg", "rb") as fp:
+        with pytest.raises(SyntaxError):
+            BmpImagePlugin.BmpImageFile(fp)
 
-            with Image.open("Tests/images/clipboard_target.png") as target:
-                assert_image_equal(im, target)
 
-    def test_save_dib(self):
-        outfile = self.tempfile("temp.dib")
+def test_save_to_bytes():
+    output = io.BytesIO()
+    im = hopper()
+    im.save(output, "BMP")
 
-        with Image.open("Tests/images/clipboard.dib") as im:
+    output.seek(0)
+    with Image.open(output) as reloaded:
+        assert im.mode == reloaded.mode
+        assert im.size == reloaded.size
+        assert reloaded.format == "BMP"
+
+
+def test_save_too_large(tmp_path):
+    outfile = str(tmp_path / "temp.bmp")
+    with Image.new("RGB", (1, 1)) as im:
+        im._size = (37838, 37838)
+        with pytest.raises(ValueError):
             im.save(outfile)
 
-            with Image.open(outfile) as reloaded:
-                self.assertEqual(reloaded.format, "DIB")
-                self.assertEqual(reloaded.get_format_mimetype(), "image/bmp")
-                assert_image_equal(im, reloaded)
 
-    def test_rgba_bitfields(self):
-        # This test image has been manually hexedited
-        # to change the bitfield compression in the header from XBGR to RGBA
-        with Image.open("Tests/images/rgb32bf-rgba.bmp") as im:
+def test_dpi():
+    dpi = (72, 72)
+
+    output = io.BytesIO()
+    with hopper() as im:
+        im.save(output, "BMP", dpi=dpi)
+
+    output.seek(0)
+    with Image.open(output) as reloaded:
+        assert reloaded.info["dpi"] == dpi
+
+
+def test_save_bmp_with_dpi(tmp_path):
+    # Test for #1301
+    # Arrange
+    outfile = str(tmp_path / "temp.jpg")
+    with Image.open("Tests/images/hopper.bmp") as im:
+
+        # Act
+        im.save(outfile, "JPEG", dpi=im.info["dpi"])
+
+        # Assert
+        with Image.open(outfile) as reloaded:
+            reloaded.load()
+            assert im.info["dpi"] == reloaded.info["dpi"]
+            assert im.size == reloaded.size
+            assert reloaded.format == "JPEG"
+
+
+def test_load_dpi_rounding():
+    # Round up
+    with Image.open("Tests/images/hopper.bmp") as im:
+        assert im.info["dpi"] == (96, 96)
 
-            # So before the comparing the image, swap the channels
-            b, g, r = im.split()[1:]
-            im = Image.merge("RGB", (r, g, b))
+    # Round down
+    with Image.open("Tests/images/hopper_roundDown.bmp") as im:
+        assert im.info["dpi"] == (72, 72)
 
-        with Image.open("Tests/images/bmp/q/rgb32bf-xbgr.bmp") as target:
+
+def test_save_dpi_rounding(tmp_path):
+    outfile = str(tmp_path / "temp.bmp")
+    with Image.open("Tests/images/hopper.bmp") as im:
+        im.save(outfile, dpi=(72.2, 72.2))
+        with Image.open(outfile) as reloaded:
+            assert reloaded.info["dpi"] == (72, 72)
+
+        im.save(outfile, dpi=(72.8, 72.8))
+    with Image.open(outfile) as reloaded:
+        assert reloaded.info["dpi"] == (73, 73)
+
+
+def test_load_dib():
+    # test for #1293, Imagegrab returning Unsupported Bitfields Format
+    with Image.open("Tests/images/clipboard.dib") as im:
+        assert im.format == "DIB"
+        assert im.get_format_mimetype() == "image/bmp"
+
+        with Image.open("Tests/images/clipboard_target.png") as target:
             assert_image_equal(im, target)
+
+
+def test_save_dib(tmp_path):
+    outfile = str(tmp_path / "temp.dib")
+
+    with Image.open("Tests/images/clipboard.dib") as im:
+        im.save(outfile)
+
+        with Image.open(outfile) as reloaded:
+            assert reloaded.format == "DIB"
+            assert reloaded.get_format_mimetype() == "image/bmp"
+            assert_image_equal(im, reloaded)
+
+
+def test_rgba_bitfields():
+    # This test image has been manually hexedited
+    # to change the bitfield compression in the header from XBGR to RGBA
+    with Image.open("Tests/images/rgb32bf-rgba.bmp") as im:
+
+        # So before the comparing the image, swap the channels
+        b, g, r = im.split()[1:]
+        im = Image.merge("RGB", (r, g, b))
+
+    with Image.open("Tests/images/bmp/q/rgb32bf-xbgr.bmp") as target:
+        assert_image_equal(im, target)