Themes: Add wp-singular to the list of body classes when viewing …

…a single post object.

The `wp-singular` class includes a `wp` prefix to avoid conflicts with existing classes. This changeset also updates the `Tests_Post_GetBodyClass` PHPUnit test to include the new CSS class.

Props danielpataki, peterwilsoncc, swissspidy, johnbillion, eceleste, poena, audrasjb, raj198, shailu25.
Fixes #35164.




git-svn-id: https://develop.svn.wordpress.org/trunk@59689 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post-template.php

@@ -676,6 +676,8 @@ function get_body_class( $css_class = '' ) {
 		$post_id   = $post->ID;
 		$post_type = $post->post_type;
 
+		$classes[] = 'wp-singular';
+
 		if ( is_page_template() ) {
 			$classes[] = "{$post_type}-template";
 

tests/phpunit/tests/post/getBodyClass.php

@@ -105,6 +105,7 @@ public function test_singular_body_classes() {
 		$this->assertContains( 'single-post', $class );
 		$this->assertContains( "postid-{$post_id}", $class );
 		$this->assertContains( 'single-format-standard', $class );
+		$this->assertContains( 'wp-singular', $class );
 	}
 
 	public function test_page_template_body_classes_no_template() {