def METHOD_NAME():
    assert JustfixUser().formatted_phone_number() == ""
    user = JustfixUser(phone_number="5551234567")
    assert user.formatted_phone_number() == "(555) 123-4567"
    user = JustfixUser(phone_number="999999999999999999")
    assert user.formatted_phone_number() == "999999999999999999"