public function test_perflab_maybe_set_object_cache_dropin_disabled_via_filter() {
		global $wp_filesystem;

		$this->set_up_mock_filesystem();

		// Ensure PL object-cache.php drop-in is not present and constant is not set.
		$this->assertFalse( $wp_filesystem->exists( WP_CONTENT_DIR . '/object-cache.php' ) );
		$this->assertFalse( PERFLAB_OBJECT_CACHE_DROPIN_VERSION );

		// Add filter to disable drop-in.
		add_filter( 'perflab_disable_object_cache_dropin', '__return_true' );

		// Run function to place drop-in and ensure it still doesn't exist afterwards.
		perflab_maybe_set_object_cache_dropin();
		$this->assertFalse( $wp_filesystem->exists( WP_CONTENT_DIR . '/object-cache.php' ) );
	}