def METHOD_NAME(self):
    """
    Download xform via briefcase api
    """
    with HTTMock(form_list_xml):
        self.bc.download_xforms()
    is_local = storage.__class__.__name__ == 'FileSystemStorage'
    forms_folder_path = os.path.join('deno',
                                     'briefcase',
                                     'forms',
                                     self.xform.id_string)
    forms_path = os.path.join(forms_folder_path,
                              '%s.xml' % self.xform.id_string)
    form_media_path = os.path.join(forms_folder_path, 'form-media')
    media_path = os.path.join(form_media_path, 'screenshot.png')
    if is_local:
        does_root_folder_exist = storage.exists(forms_folder_path)
        does_media_folder_exist = storage.exists(form_media_path)
    else:
        # `django-storage.exists()` does not work with folders on AWS
        sub_folders, files = storage.listdir(forms_folder_path)
        does_root_folder_exist = bool(sub_folders or files)
        does_media_folder_exist = 'form-media' in sub_folders
    self.assertTrue(does_root_folder_exist)
    self.assertTrue(storage.exists(forms_path))
    self.assertTrue(does_media_folder_exist)
    self.assertTrue(storage.exists(media_path))
    """
    Download instance xml
    """
    with HTTMock(instances_xml):
        self.bc.download_instances(self.xform.id_string)
    instance_folder_path = os.path.join(forms_folder_path, 'instances')
    if is_local:
        does_instances_folder_exist = storage.exists(instance_folder_path)
    else:
        sub_folders, _ = storage.listdir(forms_folder_path)
        does_instances_folder_exist = 'instances' in sub_folders
    self.assertTrue(does_instances_folder_exist)
    instance = Instance.objects.all()[0]
    instance_path = os.path.join(
        instance_folder_path, 'uuid%s' % instance.uuid, 'submission.xml')
    self.assertTrue(storage.exists(instance_path))
    media_file = "1335783522563.jpg"
    media_path = os.path.join(
        instance_folder_path, 'uuid%s' % instance.uuid, media_file)
    self.assertTrue(storage.exists(media_path))