gh-127146: Update test skips for Emscripten 4.0.1 (#129375)

Updates the Emscripten test skips to reflect recent changes in Emscripten capabilities.

Lib/test/test_genericpath.py

@@ -161,7 +161,7 @@ def test_exists(self):
         self.assertIs(self.pathmodule.lexists(path=filename), True)
 
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
-    @unittest.skipIf(is_emscripten, "Emscripten pipe fds have no stat")
+    @unittest.skipIf(is_emscripten, "Fixed in next Emscripten release after 4.0.1")
     def test_exists_fd(self):
         r, w = os.pipe()
         try:

Lib/test/test_io.py

@@ -3928,7 +3928,7 @@ def test_issue35928(self):
         self.assertEqual(res + f.readline(), 'foo\nbar\n')
 
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
-    @unittest.skipIf(support.is_emscripten, "Would be fixed by emscripten-core/emscripten#23306")
+    @unittest.skipIf(support.is_emscripten, "Fixed in next Emscripten release after 4.0.1")
     def test_read_non_blocking(self):
         import os
         r, w = os.pipe()

Lib/test/test_ntpath.py

@@ -940,7 +940,7 @@ def check_error(paths, expected):
         self.assertRaises(TypeError, ntpath.commonpath, ['C:\\Foo', b'Foo\\Baz'])
         self.assertRaises(TypeError, ntpath.commonpath, ['Foo', b'C:\\Foo\\Baz'])
 
-    @unittest.skipIf(is_emscripten, "Emscripten cannot fstat unnamed files.")
+    @unittest.skipIf(is_emscripten, "Fixed in next Emscripten release after 4.0.1")
     def test_sameopenfile(self):
         with TemporaryFile() as tf1, TemporaryFile() as tf2:
             # Make sure the same file is really the same

Lib/test/test_os.py

@@ -5093,7 +5093,6 @@ def test_unpickable(self):
         self.assertRaises(TypeError, pickle.dumps, scandir_iter, filename)
         scandir_iter.close()
 
-    @unittest.skipIf(support.is_emscripten, "Fixed by emscripten-core/emscripten#23139, remove when next Emscripten release comes out")
     def check_entry(self, entry, name, is_dir, is_file, is_symlink):
         self.assertIsInstance(entry, os.DirEntry)
         self.assertEqual(entry.name, name)

Lib/test/test_shutil.py

@@ -1587,7 +1587,6 @@ def test_copyfile_same_file(self):
     # the path as a directory, but on AIX the trailing slash has no effect
     # and is considered as a file.
     @unittest.skipIf(AIX, 'Not valid on AIX, see gh-92670')
-    @unittest.skipIf(support.is_emscripten, 'Fixed by emscripten-core/emscripten#23218, remove when next Emscripten release comes out')
     def test_copyfile_nonexistent_dir(self):
         # Issue 43219
         src_dir = self.mkdtemp()

Lib/test/test_signal.py

@@ -253,9 +253,7 @@ def test_invalid_socket(self):
         self.assertRaises((ValueError, OSError),
                           signal.set_wakeup_fd, fd)
 
-    # Emscripten does not support fstat on pipes yet.
-    # https://github.com/emscripten-core/emscripten/issues/16414
-    @unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
+    @unittest.skipIf(support.is_emscripten, "Fixed in next Emscripten release after 4.0.1")
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_set_wakeup_fd_result(self):
         r1, w1 = os.pipe()
@@ -274,7 +272,7 @@ def test_set_wakeup_fd_result(self):
         self.assertEqual(signal.set_wakeup_fd(-1), w2)
         self.assertEqual(signal.set_wakeup_fd(-1), -1)
 
-    @unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
+    @unittest.skipIf(support.is_emscripten, "Fixed in next Emscripten release after 4.0.1")
     @unittest.skipUnless(support.has_socket_support, "needs working sockets.")
     def test_set_wakeup_fd_socket_result(self):
         sock1 = socket.socket()
@@ -295,7 +293,7 @@ def test_set_wakeup_fd_socket_result(self):
     # On Windows, files are always blocking and Windows does not provide a
     # function to test if a socket is in non-blocking mode.
     @unittest.skipIf(sys.platform == "win32", "tests specific to POSIX")
-    @unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
+    @unittest.skipIf(support.is_emscripten, "Fixed in next Emscripten release after 4.0.1")
     @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_set_wakeup_fd_blocking(self):
         rfd, wfd = os.pipe()

Lib/test/test_tarfile.py

@@ -3800,7 +3800,6 @@ def test_absolute_hardlink(self):
                 "'parent' is a link to an absolute path")
 
     @symlink_test
-    @unittest.skipIf(support.is_emscripten, "Fixed by emscripten-core/emscripten#23136, remove when next Emscripten release comes out")
     def test_sly_relative0(self):
         # Inspired by 'relative0' in jwilk/traversal-archives
         with ArchiveMaker() as arc:

Lib/test/test_zipfile/test_core.py

@@ -624,7 +624,6 @@ def test_write_to_readonly(self):
             with self.assertRaises(ValueError):
                 zipfp.open(TESTFN, mode='w')
 
-    @unittest.skipIf(is_emscripten, "Fixed by emscripten-core/emscripten#23310")
     def test_add_file_before_1980(self):
         # Set atime and mtime to 1970-01-01
         os.utime(TESTFN, (0, 0))

Lib/test/test_zipimport.py

@@ -1038,7 +1038,6 @@ def testEmptyFile(self):
         self.assertZipFailure(TESTMOD)
 
     @unittest.skipIf(support.is_wasi, "mode 000 not supported.")
-    @unittest.skipIf(support.is_emscripten, "Fixed by emscripten-core/emscripten#23137, remove when next Emscripten release comes out")
     def testFileUnreadable(self):
         os_helper.unlink(TESTMOD)
         fd = os.open(TESTMOD, os.O_CREAT, 000)