PHPUnit tests: Add/improve @covers annotations for WP 6.2

[pbearne]

Previously:

• #39265 (up to 6.1)

Continuation of ongoing work to add and/or improve the PHPUnit tests @covers annotations for more accurate coverage reporting.

[SergeyBiryukov]

In 54710:

Tests: Move the tests for WP class methods to the wp directory.

This aims to bring some consistency to the location of the tests for this class.

Includes adding the missing @covers tags.

Follow-up to [36177], [51622], [54250].

Props pbearne, SergeyBiryukov.
See #56793, #56782.

[SergeyBiryukov]

In 54711:

Tests: Move dbDelta() tests to the db directory.

This aims to bring some consistency with other database-related tests.

Includes adding a missing @covers tag to the class DocBlock.

Follow-up to [30345], [32108], [32770], [51798].

Props pbearne, SergeyBiryukov.
See #56793, #56782.

[SergeyBiryukov]

In 54716:

Tests: Move the tests for pluggable function signatures to the pluggable directory.

This aims to bring some consistency to the location of pluggable function tests.

Includes:

• Renaming the test class to better reflect the intention of the tests.
• Adding a @coversNothing tag to the class DocBlock.

Follow-up to [34126], [53478], [54702].

Props pbearne, SergeyBiryukov.
See #56793, #56782.

the ongoing covers ticket
I am still rechecking all the files so expect up[date to the pull request

Trac:
https://core.trac.wordpress.org/ticket/56782
https://core.trac.wordpress.org/ticket/39265

[hellofromTonya]

There are new commits in the PR that are ready for review and commit. I'll be working on these during the remainder of the 6.2 cycle.

Triage folks:
This Trac ticket is for tests only. Please leave it in the 6.2 milestone. Thanks :)

[hellofromTonya]

Sadly other things took my attention from this. Closing this ticket as fixed for the 6.2 cycle. Work will continue once 6.3-alpha opens.

[hellofromTonya]

#57958 is now open for this work to continue in the 6.3 cycle.

@pbearne Can I recommend breaking this into smaller PR. Or at least classes should be in new PR. This PR is really hard to review and harder to commit / revert.