chore: improve test coverage

[frostming]

Signed-off-by: Frost Ming me@frostming.com

Pull Request Checklist

• A news fragment is added in news/ describing what is new.
• Test cases added for changed code.

Describe what you have changed in this PR.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep the search modules in coverage accounting

Removing both search modules from coverage, while also marking PyPIRepository.search() as uncovered, causes the 84% coverage gate to ignore this still-callable code entirely. In particular, tests/cli/test_search.py already exercises pdm.cli.commands.search, but those tests will no longer contribute coverage or detect a future loss of execution; regressions in SearchResultParser and repository search can similarly accumulate without affecting CI. Keep these modules measured and add focused tests for the remaining paths instead of excluding them wholesale.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.16%. Comparing base (8ddfa3a) to head (90bb028).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3828      +/-   ##
==========================================
+ Coverage   86.43%   88.16%   +1.72%     
==========================================
  Files         121      121              
  Lines       13232    13221      -11     
  Branches     2247     2246       -1     
==========================================
+ Hits        11437    11656     +219     
+ Misses       1182      982     -200     
+ Partials      613      583      -30     

Flag	Coverage Δ
unittests	88.04% <ø> (+1.72%)	⬆️

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