public function test_add_dynamic_partials() {
    $partial_ids = array( 'recognized', 'recognized-class', 'unrecognized', 'already-added' );

    $partials = $this->selective_refresh->add_dynamic_partials( $partial_ids );
    $this->assertEmpty( $partials );

    $this->selective_refresh->add_partial( 'already-added' );

    add_filter( 'customize_dynamic_partial_args', array( $this, 'filter_customize_dynamic_partial_args' ), 10, 2 );
    add_filter( 'customize_dynamic_partial_class', array( $this, 'filter_customize_dynamic_partial_class' ), 10, 3 );

    $partials = $this->selective_refresh->add_dynamic_partials( $partial_ids );
    $this->assertSameSets( array( 'recognized', 'recognized-class' ), wp_list_pluck( $partials, 'id' ) );

    $this->assertInstanceOf( 'Tested_Custom_Partial', $this->selective_refresh->get_partial( 'recognized-class' ) );
    $this->assertNotInstanceOf( 'Tested_Custom_Partial', $this->selective_refresh->get_partial( 'recognized' ) );
    $this->assertSame( '.recognized', $this->selective_refresh->get_partial( 'recognized' )->selector );
  }