Add UTs - sharding-driver

[shashankrnr32]

Summary

@shashankrnr32

This is a Pull Request that is capable of changing the world.

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Fixes: #{issue_number}

Checklist

Checklist (Developer)

Prerequisites

• I have read the contribution guidelines

Code Analysis

• Covered by Unittests
• All Code analysis checks are passing

Project related

• Project API has modified and is backward incompatible
• I have updated the relevant documentation

Pre-Merge Checklist

• All the build jobs are passing

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Checklist (Reviewer 1 - Language Reviewer)

• Reviewed Source Code
• Reviewed Tests (If applicable)
• Reviewed Documentation (If applicable)

Checklist (Reviewer 2 - Functional Reviewer)

• Reviewed Source Code
• Reviewed Tests (If applicable)
• Reviewed Documentation (If applicable)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

100.0% Coverage
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +19.81 🎉

Comparison is base (d65b74f) 71.14% compared to head (bba536e) 90.95%.

Additional details and impacted files

@@              Coverage Diff              @@
##               main      #47       +/-   ##
=============================================
+ Coverage     71.14%   90.95%   +19.81%     
- Complexity      361      507      +146     
=============================================
  Files            33       34        +1     
  Lines           901      907        +6     
  Branches         25       25               
=============================================
+ Hits            641      825      +184     
+ Misses          255       77      -178     
  Partials          5        5               

Impacted Files	Coverage Δ
...e/client/CollectionShardedReactiveMongoClient.java	100.00% <100.00%> (+100.00%)	⬆️
...re/client/CompositeShardedReactiveMongoClient.java	100.00% <100.00%> (ø)
.../core/database/CollectionShardedMongoDatabase.java	100.00% <100.00%> (+94.20%)	⬆️
...tabase/CollectionShardedReactiveMongoDatabase.java	100.00% <100.00%> (+100.00%)	⬆️

... and 1 file with indirect coverage changes

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