Enhance clear_expired tests.

[n2ygk]

Fixes#1065

Description of the Change

• Flags no coverage for cleartoken management command since the test is in test_models.
• Expand coverage of the clear_expired tests.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.87%. Comparing base (689269e) to head (40dba48).
Report is 203 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #1088 +/- ## ========================================== + Coverage 96.65% 96.87% +0.21%  ========================================== Files 31 31 Lines 1763 1759 -4 ========================================== Hits 1704 1704 + Misses 59 55 -4 

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[n2ygk]

@Andrew-Chen-Wang See 6ddb3d7 for broken commit due to: ValueError: bulk_create() prohibited to prevent data loss due to unsaved related object 'access_token'. in attempting to follow your advice at #1084 (comment)

[Andrew-Chen-Wang]

f-strings used for performance and readability improvement.

bulk_create does not call save(), but the pks are set given the database is Postgres, MariaDB, or SQLite3 (at some version+ that GitHub actions and all modern computers prob already have).

For reference, here's where it's set: https://github.com/django/django/blob/dc9deea8e85641695e489e43ed5d5638134c15c7/django/db/models/query.py#L514

[n2ygk]

I'll circle back soon and make sure my test logic is correct (probably isn't) now that the code is running;-)

[Andrew-Chen-Wang]

LGTM!