Apply suggestions from code review - update comment and remove test f…

…ixture

lib/class-wp-theme-json-gutenberg.php

@@ -2084,7 +2084,7 @@ protected static function flatten_tree( $tree, $prefix = '', $token = '--' ) {
 	 * @since 5.9.0 Added the `$settings` and `$properties` parameters.
 	 * @since 6.1.0 Added `$theme_json`, `$selector`, and `$use_root_padding` parameters.
 	 * @since 6.5.0 Passing current theme JSON settings to wp_get_typography_font_size_value().
-	 * @since 6.6.0 Parsing background styles with style engine to correctly fetch background-image url.
+	 * @since 6.6.0 Using style engine to correctly fetch background CSS values.
 	 *
 	 * @param array   $styles Styles to process.
 	 * @param array   $settings Theme settings.

phpunit/class-wp-theme-json-test.php

@@ -4848,31 +4848,6 @@ public function test_get_top_level_background_image_styles() {
 						'backgroundRepeat'   => 'no-repeat',
 						'backgroundPosition' => 'center center',
 					),
-					'blocks'     => array(
-						'core/paragraph' => array(
-							'background' => array(
-								'backgroundImage'    => array(
-									'url'    => 'http://example.org/image.png',
-									'source' => 'file',
-								),
-								'backgroundSize'     => 'cover',
-								'backgroundRepeat'   => 'no-repeat',
-								'backgroundPosition' => 'center center',
-							),
-						),
-					),
-					'elements'   => array(
-						'button' => array(
-							'background' => array(
-								'backgroundImage'    => array(
-									'url' => 'http://example.org/image.png',
-								),
-								'backgroundSize'     => 'cover',
-								'backgroundRepeat'   => 'no-repeat',
-								'backgroundPosition' => 'center center',
-							),
-						),
-					),
 				),
 			)
 		);