'POST to the view being tested.
Arguments
course_id (str) --  ID of course for which a seat should be ordered.
:return: Response'

def _post_to_view(self, course_id=None, marketing_email_opt_in=False, include_utm_cookie=False):

    payload = {'course_id': unicode((course_id or self.course.id))}
    if marketing_email_opt_in:
        payload['email_opt_in'] = True
    self.client.cookies[SAILTHRU_CAMPAIGN_COOKIE] = 'sailthru    id'
    if include_utm_cookie:
        self.client.cookies[UTM_COOKIE_NAME] = json.dumps(UTM_COOKIE_CONTENTS)
    return self.client.post(self.url, payload)
