Improve Test Coverage for Auto Sizes Plugin

[sarthak-19]

Summary

This is part of https://github.com/WordPress/performance/issues/1789:

• Ignore Coverage for Non-Critical Code Blocks
• Add Missing @covers Annotations
• Add Missing Tests

Before : 79.00% ⚠️	After: 95.00% ✅

cc : @westonruter

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 68.53%. Comparing base (1fc81a3) to head (3a983f2). :warning: Report is 19 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #1879      +/-   ##
==========================================
+ Coverage   68.21%   68.53%   +0.32%     
==========================================
  Files          93       91       -2     
  Lines        7947     7930      -17     
==========================================
+ Hits         5421     5435      +14     
+ Misses       2526     2495      -31     

Flag	Coverage Δ
multisite	68.53% <ø> (+0.32%)	:arrow_up:
single	35.78% <ø> (+0.22%)	:arrow_up:

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Co-authored-by: sarthak-19 <[email protected]>
Co-authored-by: mukeshpanchal27 <[email protected]>
Co-authored-by: pravinparmar2404 <[email protected]>
Co-authored-by: westonruter <[email protected]>
Co-authored-by: phanduynam <[email protected]>

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[phanduynam]

This issue has been resolved, please close it admin

[mukeshpanchal27]

@sarthak-19 Could you please resolve the conflict and address the feedbacks?

[sarthak-19]

@mukeshpanchal27 Will do today 😅

[mukeshpanchal27]

@sarthak-19 @westonruter I’m going to merge these PR.

Since they don’t affect production code and only improve test coverage, any remaining items can be addressed in a separate follow-up PR.