refactor: change signature of methods of AssertCodePanics trait so that …

[haraldmaida]

…code assertions can not be chained

Assertions whether a closure panics or does not panic can not be chained. A closure can only be asserted once. Currently it is possible to write chained assertions for a closure, but the second assertion panics at runtime.

Instead of a runtime error, a compile time error should be issued, when a chained assertion is written for a closure.

The signature of the methods of the extension trait AssertCodePanics have been changed to return a Spec with a subject of the unit type. It is now longer possible to compile chained assertions for panicking code on closures.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.92%. Comparing base (148acb0) to head (1240e00).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #36      +/-   ##
==========================================
- Coverage   96.13%   95.92%   -0.21%     
==========================================
  Files          25       25              
  Lines        2849     2850       +1     
  Branches     2849     2850       +1     
==========================================
- Hits         2739     2734       -5     
- Misses        106      112       +6     
  Partials        4        4              

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