def load(self, requirements_file=None):
        """Load or reload requirements from a requirements.txt file.

        :param requirements_file: if not given, the filename used from
            initialization will be read again.
        """
        if requirements_file is None:
            requirements_file = self.filename
            if requirements_file is None:
                raise ValueError("no filename provided")
        elif isinstance(requirements_file, text_type):
            requirements_file = Path(requirements_file)
        self.clear()
        with requirements_file.open() as f:
            self.loads(f.read())

        if isinstance(requirements_file, (text_type, Path)):
            self.filename = requirements_file
def setUp(self):
        super(ExplorationVoiceoverApplicationUnitTest, self).setUp()
        self.signup('author@example.com', 'author')
        self.author_id = self.get_user_id_from_email('author@example.com')

        self.signup('reviewer@example.com', 'reviewer')
        self.reviewer_id = self.get_user_id_from_email('reviewer@example.com')

        self.voiceover_application = (
            suggestion_registry.ExplorationVoiceoverApplication(
                'application_id', 'exp_id', suggestion_models.STATUS_IN_REVIEW,
                self.author_id, None, 'en', 'audio_file.mp3', '<p>Content</p>',
                None))