async def METHOD_NAME(rest_api):
    """
    Test whether an error is returned if we try to add a tag to content with an invalid infohash
    """
    post_data = {"knowledge": [tag_to_statement("abc"), tag_to_statement("def")]}
    await do_request(rest_api, 'knowledge/3f3', request_type="PATCH", expected_code=400, post_data=post_data)
    await do_request(rest_api, 'knowledge/3f3f', request_type="PATCH", expected_code=400, post_data=post_data)