A minor clarification about diff tests

[AlekSi]

Description

For everyone to agree.

Readiness checklist

• I added tests for new functionality or bugfixes.
• I ran task all, and it passed.
• I added/updated comments for both exported and unexported top-level declarations (functions, types, etc).
• I checked comments rendering with task godocs.
• I ensured that the title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Assignee, Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[vercel]

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Name	Status	Preview	Updated
ferret-db	✅ Ready (Inspect)	Visit Preview	Oct 28, 2022 at 11:50AM (UTC)

[codecov]

Codecov Report

Merging #1339 (f6153bd) into main (05be2d5) will increase coverage by 20.48%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1339       +/-   ##
===========================================
+ Coverage   46.60%   67.09%   +20.48%     
===========================================
  Files         279      279               
  Lines       13134    13134               
===========================================
+ Hits         6121     8812     +2691     
+ Misses       6276     3397     -2879     
- Partials      737      925      +188     

Impacted Files	Coverage Δ
internal/util/version/version.go	48.52% <0.00%> (-4.42%)	⬇️
internal/clientconn/conn.go	44.70% <0.00%> (+0.68%)	⬆️
integration/helpers.go	87.23% <0.00%> (+1.06%)	⬆️
internal/handlers/pg/pgdb/collections.go	50.00% <0.00%> (+2.27%)	⬆️
internal/handlers/pg/pgdb/settings.go	39.53% <0.00%> (+2.32%)	⬆️
internal/handlers/pg/pgdb/tables.go	64.70% <0.00%> (+2.94%)	⬆️
internal/handlers/pg/pgdb/databases.go	55.00% <0.00%> (+5.00%)	⬆️
internal/handlers/common/limit.go	75.00% <0.00%> (+8.33%)	⬆️
internal/types/document.go	88.04% <0.00%> (+9.78%)	⬆️
internal/handlers/common/typecode.go	94.73% <0.00%> (+11.84%)	⬆️
... and 49 more

Flag	Coverage Δ
integration	63.18% <ø> (+25.90%)	⬆️
mongodb	14.29% <ø> (-0.01%)	⬇️
pg	52.75% <ø> (?)
tigris	34.63% <ø> (-0.03%)	⬇️
unit	26.04% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

[rumyantseva]

👌

[AlekSi]

@Fashander PTAL

[AlekSi]

@Fashander PTAL