Replace unittest with pytest

Tests/test_file_im.py

@@ -1,89 +1,98 @@
-import unittest
-
 import pytest
 from PIL import Image, ImImagePlugin
 
-from .helper import PillowTestCase, assert_image_equal, hopper, is_pypy
+from .helper import assert_image_equal, hopper, is_pypy
 
 # sample im
 TEST_IM = "Tests/images/hopper.im"
 
 
-class TestFileIm(PillowTestCase):
-    def test_sanity(self):
+def test_sanity():
+    with Image.open(TEST_IM) as im:
+        im.load()
+        assert im.mode == "RGB"
+        assert im.size == (128, 128)
+        assert im.format == "IM"
+
+
+@pytest.mark.skipif(is_pypy(), reason="Requires CPython")
+def test_unclosed_file():
+    def open():
+        im = Image.open(TEST_IM)
+        im.load()
+
+    pytest.warns(ResourceWarning, open)
+
+
+def test_closed_file():
+    def open():
+        im = Image.open(TEST_IM)
+        im.load()
+        im.close()
+
+    pytest.warns(None, open)
+
+
+def test_context_manager():
+    def open():
         with Image.open(TEST_IM) as im:
             im.load()
-            self.assertEqual(im.mode, "RGB")
-            self.assertEqual(im.size, (128, 128))
-            self.assertEqual(im.format, "IM")
 
-    @unittest.skipIf(is_pypy(), "Requires CPython")
-    def test_unclosed_file(self):
-        def open():
-            im = Image.open(TEST_IM)
-            im.load()
+    pytest.warns(None, open)
 
-        pytest.warns(ResourceWarning, open)
 
-    def test_closed_file(self):
-        def open():
-            im = Image.open(TEST_IM)
-            im.load()
-            im.close()
+def test_tell():
+    # Arrange
+    with Image.open(TEST_IM) as im:
 
-        pytest.warns(None, open)
+        # Act
+        frame = im.tell()
 
-    def test_context_manager(self):
-        def open():
-            with Image.open(TEST_IM) as im:
-                im.load()
+    # Assert
+    assert frame == 0
 
-        pytest.warns(None, open)
 
-    def test_tell(self):
-        # Arrange
-        with Image.open(TEST_IM) as im:
+def test_n_frames():
+    with Image.open(TEST_IM) as im:
+        assert im.n_frames == 1
+        assert not im.is_animated
 
-            # Act
-            frame = im.tell()
 
-        # Assert
-        self.assertEqual(frame, 0)
+def test_eoferror():
+    with Image.open(TEST_IM) as im:
+        n_frames = im.n_frames
 
-    def test_n_frames(self):
-        with Image.open(TEST_IM) as im:
-            self.assertEqual(im.n_frames, 1)
-            self.assertFalse(im.is_animated)
+        # Test seeking past the last frame
+        with pytest.raises(EOFError):
+            im.seek(n_frames)
+        assert im.tell() < n_frames
 
-    def test_eoferror(self):
-        with Image.open(TEST_IM) as im:
-            n_frames = im.n_frames
+        # Test that seeking to the last frame does not raise an error
+        im.seek(n_frames - 1)
 
-            # Test seeking past the last frame
-            self.assertRaises(EOFError, im.seek, n_frames)
-            self.assertLess(im.tell(), n_frames)
 
-            # Test that seeking to the last frame does not raise an error
-            im.seek(n_frames - 1)
+def test_roundtrip(tmp_path):
+    for mode in ["RGB", "P", "PA"]:
+        out = str(tmp_path / "temp.im")
+        im = hopper(mode)
+        im.save(out)
+        with Image.open(out) as reread:
+            assert_image_equal(reread, im)
 
-    def test_roundtrip(self):
-        for mode in ["RGB", "P", "PA"]:
-            out = self.tempfile("temp.im")
-            im = hopper(mode)
-            im.save(out)
-            with Image.open(out) as reread:
 
-                assert_image_equal(reread, im)
+def test_save_unsupported_mode(tmp_path):
+    out = str(tmp_path / "temp.im")
+    im = hopper("HSV")
+    with pytest.raises(ValueError):
+        im.save(out)
 
-    def test_save_unsupported_mode(self):
-        out = self.tempfile("temp.im")
-        im = hopper("HSV")
-        self.assertRaises(ValueError, im.save, out)
 
-    def test_invalid_file(self):
-        invalid_file = "Tests/images/flower.jpg"
+def test_invalid_file():
+    invalid_file = "Tests/images/flower.jpg"
 
-        self.assertRaises(SyntaxError, ImImagePlugin.ImImageFile, invalid_file)
+    with pytest.raises(SyntaxError):
+        ImImagePlugin.ImImageFile(invalid_file)
 
-    def test_number(self):
-        self.assertEqual(1.2, ImImagePlugin.number("1.2"))
+
+def test_number():
+    assert ImImagePlugin.number("1.2") == 1.2