test add tests for when any value

[ChrisPulman]

What kind of change does this PR introduce?

tests

What is the current behaviour?

N/A

What is the new behaviour?

N/A

What might this PR break?

none

Please check if the PR fulfils these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:
Tests only

[codecov]

Codecov Report

Merging #2809 (afad421) into main (cf4224e) will increase coverage by 0.76%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2809      +/-   ##
==========================================
+ Coverage   63.70%   64.47%   +0.76%     
==========================================
  Files         134      134              
  Lines        4712     4712              
==========================================
+ Hits         3002     3038      +36     
+ Misses       1710     1674      -36     

Impacted Files	Coverage Δ
src/ReactiveUI/VariadicTemplates.cs	45.63% <ø> (+8.97%)	⬆️
...iveUI/Mixins/ReactiveNotifyPropertyChangedMixin.cs	83.33% <100.00%> (ø)

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[github-actions]

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