In `get_adjacent_post()`, `$excluded_terms` should check term_id rather than term_taxonom_id.

See #29663, #22112.
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Add tests for `get_adjacent_post_link()` wrappers.

Props MikeHansenMe.
See #29663.
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git-svn-id: http://core.svn.wordpress.org/trunk@30264 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't force child_of=0 for non-hierarchical taxonomies in `get_terms()`.

This forcing appears to have been introduced to save unnecessary queries, but
(a) in some cases it appeared to be causing *more* queries, and (b) it caused
incorrect results when the 'exclude_tree' param of `get_terms()` called
`get_terms()` on each item in the tree using the 'child_of' param.

Fixes #30275.
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git-svn-id: http://core.svn.wordpress.org/trunk@30265 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Use `assertEqualSets()` for some `WP_Comment_Query` tests.
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git-svn-id: http://core.svn.wordpress.org/trunk@30266 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Unset the default permalink structure after installing Multisite for automated tests.

Most of our unit tests that involve permalinks expect non-pretty permalinks;
this is the default setting for WP. However, when the test suite installs
multisite, `populate_network()` is run before WP recogizes itself as multisite,
which leads to pretty permalinks being set. This breaks a number of unit
tests in ways that are difficult to trace.
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git-svn-id: http://core.svn.wordpress.org/trunk@30267 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Correct variable name in `WP_UnitTestCase::temp_filename()`.
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