How to use the fvcore.common.file_io.PathManager.isfile function in fvcore

def test_rm(self):
        with open(os.path.join(self._tmpdir, "test_rm.txt"), "w") as f:
            rm_file = f.name
            f.write(self._tmpfile_contents)
            f.flush()
        self.assertTrue(PathManager.exists(rm_file))
        self.assertTrue(PathManager.isfile(rm_file))
        PathManager.rm(rm_file)
        self.assertFalse(PathManager.exists(rm_file))
        self.assertFalse(PathManager.isfile(rm_file))

def test_isfile(self):
        self.assertTrue(PathManager.isfile(self._tmpfile))
        # This is a directory, not a file, so it should fail
        self.assertFalse(PathManager.isfile(self._tmpdir))
        # This is a non-existing path, so it should fail
        fake_path = os.path.join(self._tmpdir, uuid.uuid4().hex)
        self.assertFalse(PathManager.isfile(fake_path))

def test_rm(self):
        with open(os.path.join(self._tmpdir, "test_rm.txt"), "w") as f:
            rm_file = f.name
            f.write(self._tmpfile_contents)
            f.flush()
        self.assertTrue(PathManager.exists(rm_file))
        self.assertTrue(PathManager.isfile(rm_file))
        PathManager.rm(rm_file)
        self.assertFalse(PathManager.exists(rm_file))
        self.assertFalse(PathManager.isfile(rm_file))

def test_bad_args(self):
        with self.assertRaises(NotImplementedError):
            PathManager.copy(
                self._remote_uri, self._remote_uri, foo="foo"  # type: ignore
            )
        with self.assertRaises(NotImplementedError):
            PathManager.exists(self._remote_uri, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.get_local_path(
                self._remote_uri, foo="foo"  # type: ignore
            )
        with self.assertRaises(NotImplementedError):
            PathManager.isdir(self._remote_uri, foo="foo")  # type: ignore
        with self.assertRaises(NotImplementedError):
            PathManager.isfile(self._remote_uri, foo="foo")  # type: ignore
        with self.assertRaises(NotImplementedError):
            PathManager.ls(self._remote_uri, foo="foo")  # type: ignore
        with self.assertRaises(NotImplementedError):
            PathManager.mkdirs(self._remote_uri, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.open(self._remote_uri, foo="foo")  # type: ignore
        with self.assertRaises(NotImplementedError):
            PathManager.rm(self._remote_uri, foo="foo")  # type: ignore

        PathManager.set_strict_kwargs_checking(False)

        PathManager.get_local_path(self._remote_uri, foo="foo")  # type: ignore
        f = PathManager.open(self._remote_uri, foo="foo")  # type: ignore
        f.close()
        PathManager.set_strict_kwargs_checking(True)

def test_bad_args(self):
        # TODO (T58240718): Replace with dynamic checks
        with self.assertRaises(ValueError):
            PathManager.copy(
                self._tmpfile, self._tmpfile, foo="foo"  # type: ignore
            )
        with self.assertRaises(ValueError):
            PathManager.exists(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.get_local_path(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.isdir(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.isfile(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.ls(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.mkdirs(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.open(self._tmpfile, foo="foo")  # type: ignore
        with self.assertRaises(ValueError):
            PathManager.rm(self._tmpfile, foo="foo")  # type: ignore

        PathManager.set_strict_kwargs_checking(False)

        PathManager.copy(
            self._tmpfile, self._tmpfile, foo="foo"  # type: ignore
        )
        PathManager.exists(self._tmpfile, foo="foo")  # type: ignore
        PathManager.get_local_path(self._tmpfile, foo="foo")  # type: ignore

def test_isfile(self):
        self.assertTrue(PathManager.isfile(self._tmpfile))
        # This is a directory, not a file, so it should fail
        self.assertFalse(PathManager.isfile(self._tmpdir))
        # This is a non-existing path, so it should fail
        fake_path = os.path.join(self._tmpdir, uuid.uuid4().hex)
        self.assertFalse(PathManager.isfile(fake_path))

def test_isfile(self):
        self.assertTrue(PathManager.isfile(self._tmpfile))
        # This is a directory, not a file, so it should fail
        self.assertFalse(PathManager.isfile(self._tmpdir))
        # This is a non-existing path, so it should fail
        fake_path = os.path.join(self._tmpdir, uuid.uuid4().hex)
        self.assertFalse(PathManager.isfile(fake_path))

def get_all_checkpoint_files(self):
        """
        Returns:
            list: All available checkpoint files (.pth files) in target
                directory.
        """
        all_model_checkpoints = [
            os.path.join(self.save_dir, file)
            for file in PathManager.ls(self.save_dir)
            if PathManager.isfile(os.path.join(self.save_dir, file))
            and file.endswith(".pth")
        ]
        return all_model_checkpoints