Block_Template_Test::test_custom_page_block_template_takes_precedence_over_all_other_templates() – Covers: https://github.com/WordPress/gutenberg/pull/30438.
Block_Template_Test::test_custom_page_php_template_takes_precedence_over_all_other_templates() – Regression: https://github.com/WordPress/gutenberg/issues/31399.