Adds useful message when test panics on no return values

[mateusmarquezini]

Description

• Adds a useful message when the test panics on no return value.

• Fixes Omitting .Return() on an expectation results in a panic and a stack trace rather than a useful error message  #729

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Version of Golang used when building/testing:

• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20

How Has This Been Tested?

I tested by using Unit tests

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c7a65e2) 75.25042% compared to head (d0fa1f9) 75.16639%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master        #736         +/-   ##
===================================================
- Coverage   75.25042%   75.16639%   -0.08403%     
===================================================
  Files              9          10          +1     
  Lines           2396        2404          +8     
===================================================
+ Hits            1803        1807          +4     
- Misses           455         459          +4     
  Partials         138         138                 

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[LandonTClipp]

This looks great. I'll approve for now and give it one last look later today and merge once the tests pass (coverage might fail but I'm going to remove that check, it's not entirely useful). Thanks for the contribution ❤️

[mateusmarquezini]

Awesome! Thanks for your patience and support @LandonTClipp!