wordpress-activitypub/tests/test-class-activitypub.php

<?php
class Test_Activitypub extends WP_UnitTestCase {
	public function test_post_type_support() {
		\add_post_type_support( 'post', 'activitypub' );
		\add_post_type_support( 'page', 'activitypub' );

		$this->assertContains( 'post', \get_post_types_by_support( 'activitypub' ) );
		$this->assertContains( 'page', \get_post_types_by_support( 'activitypub' ) );
	}
}