Add/improvement tests for Link/Bookmark API functions

[hellofromTonya]

Source: wp-includes/bookmark.php

With the goal to improve test coverage for Link/Bookmark API, this ticket

• adds missing function tests
• improves existing get_bookmarks tests (including adding unhappy paths and refactoring to data providers where appropriate)

Trac ticket: https://core.trac.wordpress.org/ticket/52988

Adds unit tests for get_bookmark().

[hellofromTonya]

Moving into 5.8, though not specifically related to a specific release itself.

It looks like there was an accidental change to package-lock.json included in 3111683 but I'll preapprove as it's really the committers responsibility to check against these things.

Yup, I did. Doh. Way too easy to accidentally commit lock file. Luckily, it's straightforward for the core committer to skip over that file and only commit the test file.

Thanks @peterwilsoncc!

[peterwilsoncc]

In 50789:

Build/Tests tools: Improve get_bookmark() test coverage.

Props hellofromtonya, peterwilsoncc.
See #52988.

[peterwilsoncc]

@hellofromTonya I've committed the get_bookmark() tests in [50789]. I've left the ticket open for now as your description suggests you wish to add further tests.

Committed as https://core.trac.wordpress.org/changeset/50789

[hellofromTonya]

Punting the remaining work for this ticket to the next milestone for completion.

[hellofromTonya]

Closing as all work has been committed.