Improve exception message for notifcation pattern

[hanfak]

TODO: compound exception message could return like this
org.assertj.core.api.SoftAssertionError:
The following 4 assertions failed:
1) [Living Guests] expected:<[7]> but was:<[6]>
2) [Library] expected:<'[clean]'> but was:<'[messy]'>
3) [Candlestick] expected:<'[pristine]'> but was:<'[bent]'>
4) [Professor] expected:<'[well kempt]'> but was:<'[bloodied and dishevelled]'>

OR

use different separator ie ;, or add as arg