Add tests on exception in delegate

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (911dbb0) to head (601cad6).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #388   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       169       169           
===========================================
  Files             11        11           
  Lines            492       492           
===========================================
  Hits             492       492           

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