Add tests for RawBrowseResponse

[jpdillingham]

This was included in the work described by #754, but I forgot about it.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #771 (d6fad19) into master (72061b6) will increase coverage by 0.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #771      +/-   ##
==========================================
+ Coverage   99.22%   99.38%   +0.16%     
==========================================
  Files         179      180       +1     
  Lines        6176     6176              
  Branches      934      934              
==========================================
+ Hits         6128     6138      +10     
+ Misses         31       21      -10     
  Partials       17       17              

Impacted Files	Coverage Δ
src/BrowseResponse.cs	100.00% <ø> (+47.61%)	:arrow_up:
src/RawBrowseResponse.cs	100.00% <100.00%> (ø)

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