added test for get_num_queries and wp_get_nocache_headers

[pbearne]

Trac ticket:

[costdev]

Thanks for this PR to improve the test suite @pbearne! Nice work!

This review contains suggestions to:

• make the tests, filenames and classnames consistent with others in the test suite.
• make the assertions stricter.
• make clear which assertion fails, and why, when multiple assertions exist.
• make a clear distinction between what is being tested.
• make tests more performant.

[costdev]

Nice work on the updates @pbearne!

Just two more requests from me to rename the files for consistency with the rest of the test suite.

[peterwilsoncc]

@pbearne @costdev I've pushed up several changes

• merged in trunk
• renamed files per Colin's earlier review
• Various coding standards fixes
• I changed the DB query for testing the number of queries increased to a simpler one: SELECT now()
• Added tests for the cache headers to account for the changes in r56134 for logged in users

[costdev]

Thanks @peterwilsoncc!

A couple of changes to docblock descriptions for consistency and so that third-person singular verbs are used.

[github-actions]

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Props pbearne, peterwilsoncc, costdev.

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[github-actions]

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