public function test_construct() {
    $this->assertTrue( post_type_exists( 'custom_css' ) );
    $this->assertSame( 'custom_css', $this->setting->type );
    $this->assertSame( get_stylesheet(), $this->setting->stylesheet );
    $this->assertSame( 'edit_css', $this->setting->capability );

    $exception = null;
    try {
      $x = new WP_Customize_Custom_CSS_Setting( $this->wp_customize, 'bad' );
      unset( $x );
    } catch ( Exception $e ) {
      $exception = $e;
    }
    $this->assertInstanceOf( 'Exception', $exception );

    $exception = null;
    try {
      $x = new WP_Customize_Custom_CSS_Setting( $this->wp_customize, 'custom_css' );
      unset( $x );
    } catch ( Exception $e ) {
      $exception = $e;
    }
    $this->assertInstanceOf( 'Exception', $exception );
  }