[PR #8332/482e6cdf backport][3.9] Add set_content_disposition test

[patchback]

This is a backport of PR #8332 as merged into master (482e6cd).

What do these changes do?

Add tests, checking set_content_disposition() case works properly

Are there changes in behavior for the user?

Is it a substantial burden for the maintainers to support this?

Related issue number

Relates #8326

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

  • name it <issue_or_pr_num>.<type>.rst (e.g. 588.bugfix.rst)

  • if you don't have an issue number, change it to the pull request
    number after creating the PR

    • .bugfix: A bug fix for something the maintainers deemed an
      improper undesired behavior that got corrected to match
      pre-agreed expectations.
    • .feature: A new behavior, public APIs. That sort of stuff.
    • .deprecation: A declaration of future API removals and breaking
      changes in behavior.
    • .breaking: When something public is removed in a breaking way.
      Could be deprecated in an earlier release.
    • .doc: Notable updates to the documentation structure or build
      process.
    • .packaging: Notes for downstreams about unobvious side effects
      and tooling. Changes in the test invocation considerations and
      runtime assumptions.
    • .contrib: Stuff that affects the contributor experience. e.g.
      Running tests, building the docs, setting up the development
      environment.
    • .misc: Changes that are hard to assign to any of the above
      categories.

  • Make sure to use full sentences with correct case and punctuation,
    for example:

    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.

    Use the past tense or the present tense a non-imperative mood,
    referring to what's changed compared to the last released version
    of this project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (82fbe64) to head (b1607e9).

Additional details and impacted files

@@            Coverage Diff             @@
##              3.9    #8333      +/-   ##
==========================================
+ Coverage   97.33%   97.39%   +0.06%     
==========================================
  Files         108      108              
  Lines       32849    32856       +7     
  Branches     3900     3901       +1     
==========================================
+ Hits        31972    32001      +29     
+ Misses        663      645      -18     
+ Partials      214      210       -4     

Flag	Coverage Δ
CI-GHA	97.30% <100.00%> (+0.05%)	⬆️
OS-Linux	96.98% <100.00%> (+0.05%)	⬆️
OS-Windows	94.53% <100.00%> (+<0.01%)	⬆️
OS-macOS	96.65% <100.00%> (+0.08%)	⬆️
Py-3.10.11	94.35% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	96.76% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.02% <100.00%> (+<0.01%)	⬆️
Py-3.12.2	97.07% <100.00%> (+0.02%)	⬆️
Py-3.8.10	94.32% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.70% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	94.34% <100.00%> (+<0.01%)	⬆️
Py-3.9.19	96.75% <100.00%> (+0.13%)	⬆️
Py-pypy7.3.15	96.29% <100.00%> (?)
VM-macos	96.65% <100.00%> (+0.08%)	⬆️
VM-ubuntu	96.98% <100.00%> (+0.05%)	⬆️
VM-windows	94.53% <100.00%> (+<0.01%)	⬆️

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