[irozum]

Adds unit tests for the REST clause in WP_Query::parse_query(): ( wp_is_serving_rest_request() && $this->is_main_query() ). This is a test-only change and adds no production behaviour.

Trac ticket: https://core.trac.wordpress.org/ticket/50213

Follow-up to [48053], which restricted the REST exemption to the main query so that secondary queries can still be is_home. The ticket was closed as fixed with needs-unit-tests still set, and nothing in tests/phpunit covered it.

What is tested (Tests_Query_ParseQuery)

• test_secondary_query_during_rest_request_can_be_home: with REST_REQUEST true, a query that is not $wp_the_query has is_home === true.
• test_main_query_during_rest_request_is_not_home: with REST_REQUEST true, the query that is $wp_the_query has is_home === false.

Why these cases

• They are the two sides of the is_main_query() condition added in [48053]. Each test asserts a precondition on is_main_query() so a setup mistake can't pass silently.
• REST_REQUEST is a constant, so both tests use @runInSeparateProcess with @preserveGlobalState disabled, as wpIsServingRestRequest.php does.

Verification

• Removing && $this->is_main_query() makes only the secondary-query test fail.
• Deleting the whole REST clause makes only the main-query test fail.
• Tests_Query_ParseQuery passes (19 tests) and PHPCS reports no errors or warnings on the file.

Use of AI Tools

This change was written with Claude Code (Claude Sonnet 5.5), which drafted the tests and ran the verification above.

This PR is for code review only. Please do not merge it from GitHub; commits happen through Trac.

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