test: assert Value.Store(nil) panics in value_test.go

[aoright]

Summary

• Add test assertion in value_test.go verifying that Value.Store(nil) panics according to the sync/atomic.Value specification.

[CLAassistant]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (703f34c) to head (1a5e4df).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #211   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           23        23           
  Lines          438       402   -36     
=========================================
- Hits           438       402   -36     

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