Creating Custom Module In Divi

add_action( 'et_builder_ready', 'evr_initialize_divi_modules' );

function evr_initialize_divi_modules() {
    if ( ! class_exists( 'ET_Builder_Module' ) ) { return; }

    class EVR_Builder_Module_Testimonial extends ET_Builder_Module {
        function init() {
            $this->name       = esc_html__( 'Testimonial', 'evr' );
            $this->slug       = 'evr_pb_testimonial';
            $this->fb_support = true;

            // ...

        }
    }
}