Add test for get_attribute() when in closing tag

phpunit/html/wp-html-tag-processor-test.php

@@ -74,6 +74,19 @@ public function test_get_attribute_returns_null_when_not_in_open_tag() {
 		$this->assertNull( $p->get_attribute( 'class' ), 'Accessing an attribute of a non-existing tag did not return null' );
 	}
 
+	/**
+	 * @ticket 56299
+	 *
+	 * @covers next_tag
+	 * @covers get_attribute
+	 */
+	public function test_get_attribute_returns_null_when_in_closing_tag() {
+		$p = new WP_HTML_Tag_Processor( '<div class="test">Test</div>' );
+		$this->assertTrue( $p->next_tag( 'div' ), 'Querying an existing tag did not return true' );
+		$this->assertTrue( $p->next_tag( array( 'tag_closers' => 'visit' ) ), 'Querying an existing closing tag did not return true' );
+		$this->assertNull( $p->get_attribute( 'class' ), 'Accessing an attribute of a closing tag did not return null' );
+	}
+
 	/**
 	 * @ticket 56299
 	 *