old_contents: from flask import Blueprint
  
  from app.errors import register_errors
  
  email_branding_blueprint = Blueprint('letter_branding', __name__, url_prefix='letter-branding')
  register_errors(email_branding_blueprint)
new_contents: from flask import Blueprint
  
  from app.errors import register_errors
  
  email_branding_blueprint = Blueprint('letter_branding', __name__, url_prefix='letter-branding')
  register_errors(email_branding_blueprint)
  
subject: Fix mock in unit test. Not sure why it passed locally with previous mock.