How to use the jishaku.hljs.get_language function in jishaku

def test_hljs(filename, language):
    assert get_language(filename) == language

if encoding_match:
                encoding = encoding_match.group(1)
            else:
                raise exc

            try:
                lines = raw_content.decode(encoding.decode('utf-8')).split('\n')
            except UnicodeDecodeError as exc2:
                raise exc2 from exc

        del raw_content

        # If the first line is a shebang,
        if lines[0].startswith('#!'):
            # prioritize its declaration over the extension.
            language = get_language(lines[0]) or language

        super().__init__(prefix=f'```{language}', suffix='```', **kwargs)

        if line_span:
            line_span = sorted(line_span)

            if min(line_span) < 1 or max(line_span) > len(lines):
                raise ValueError("Linespan goes out of bounds.")

            lines = lines[line_span[0] - 1:line_span[1]]

        for line in lines:
            self.add_line(line)

def __init__(self, fp, line_span=None, language_hints=(), **kwargs):
        language = ''

        for hint in language_hints:
            language = get_language(hint)

            if language:
                break

        if not language:
            try:
                language = get_language(fp.name)
            except AttributeError:
                pass

        raw_content = fp.read()

        try:
            lines = raw_content.decode('utf-8').split('\n')
        except UnicodeDecodeError as exc:
            # This file isn't UTF-8.

def __init__(self, fp, line_span=None, language_hints=(), **kwargs):
        language = ''

        for hint in language_hints:
            language = get_language(hint)

            if language:
                break

        if not language:
            try:
                language = get_language(fp.name)
            except AttributeError:
                pass

        raw_content = fp.read()

        try:
            lines = raw_content.decode('utf-8').split('\n')
        except UnicodeDecodeError as exc:
            # This file isn't UTF-8.

            #  By Python and text-editor convention,
            # there may be a hint as to what the actual encoding is
            # near the start of the file.

            encoding_match = self.__encoding_regex.search(raw_content[:128])