Tests: Fill global styles REST read-side empty stubs.

[shail-mehta]

Trac ticket: https://core.trac.wordpress.org/ticket/40538

What

Replaces the empty @doesNotPerformAssertions stubs for test_context_param() and test_get_items() in the global styles REST API tests with real assertions.

Why

Per #40538, remaining read-side empty stubs should become real assertions. rest-global-styles-controller.php has two claimable read-side cases. Write-side and prepare_item stubs are left alone pending #66073.

How

In WP_REST_Global_Styles_Controller_Test:

• test_context_param() — OPTIONS on single and theme global styles routes; assert no context arg
• test_get_items() — GET /wp/v2/global-styles and assert rest_no_route / 404 (no collection route)

Testing instructions

1. From the repo root, run:

node ./tools/local-env/scripts/docker.js run --rm php ./vendor/bin/phpunit --filter 'WP_REST_Global_Styles_Controller_Test::test_context_param|WP_REST_Global_Styles_Controller_Test::test_get_items'

2. Confirm both tests pass and are not reported as risky.

Use of AI Tools

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Props shailu25, lancewillett.

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[lancewillett]

The OPTIONS checks in test_context_param() exercise registered endpoints and look useful. Please keep those and restore the documented stub for test_get_items().

There is no collection operation here. Checking that its unregistered URL returns 404 tests the router fallback, rather than a global-styles read operation. The ticket guidance permits documenting unsupported operations.

The patch passes locally and CI is green. This should be ready for another look once that scope is trimmed.

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_{Adversarial review · gpt-6}

[shail-mehta]

Applied changes in latest commit.

[lancewillett]

PR #13854 landed in https://core.trac.wordpress.org/changeset/64020