Add tests for SentryValues

[philipphofmann]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

Add tests for SentryValues to raise its code coverage to 100%.

💡 Motivation and Context

Easier to change SentryValues.

💚 How did you test it?

With running the unit tests.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

[codecov-io]

Codecov Report

Merging #238 into master will increase coverage by 0.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #238      +/-   ##
============================================
+ Coverage     58.46%   58.54%   +0.07%     
- Complexity      573      574       +1     
============================================
  Files            72       72              
  Lines          2699     2699              
  Branches        237      237              
============================================
+ Hits           1578     1580       +2     
+ Misses         1006     1005       -1     
+ Partials        115      114       -1

Impacted Files	Coverage Δ	Complexity Δ
...ore/src/main/java/io/sentry/core/SentryValues.java	100% <0%> (+33.33%)	3% <0%> (+1%)	⬆️

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[bruno-garcia]

Thanks @philipphofmann