Only add test to PPM

Tests/test_file_jpeg.py

@@ -1,6 +1,5 @@
 import os
 import re
-import sys
 from io import BytesIO
 
 import pytest
@@ -871,33 +870,6 @@ def test_getxmp(self):
             with Image.open("Tests/images/hopper.jpg") as im:
                 assert im.getxmp() == {}
 
-    @pytest.mark.parametrize("buffer", (True, False))
-    def test_save_stdout(self, buffer):
-        old_stdout = sys.stdout
-
-        if buffer:
-
-            class MyStdOut:
-                buffer = BytesIO()
-
-            mystdout = MyStdOut()
-        else:
-            mystdout = BytesIO()
-
-        sys.stdout = mystdout
-
-        with Image.open(TEST_FILE) as im:
-            im.save(sys.stdout, "JPEG")
-            im_roundtrip = self.roundtrip(im)
-
-        # Reset stdout
-        sys.stdout = old_stdout
-
-        if buffer:
-            mystdout = mystdout.buffer
-        with Image.open(mystdout) as reloaded:
-            assert_image_equal(reloaded, im_roundtrip)
-
 
 @pytest.mark.skipif(not is_win32(), reason="Windows only")
 @skip_unless_feature("jpg")