getFilterHtmlRestrictions example

else {
        $this->assertContains('sourceEditing', $editor_before->getSettings()['toolbar']['items']);
        $this->assertSame(
          static::getSourceEditingRestrictions($editor_before)->toCKEditor5ElementsArray(),
          static::getSourceEditingRestrictions($editor_after)->toCKEditor5ElementsArray()
        );
      }
    }

    // 3. `filter_html` restrictions MUST remain unchanged.     if ($filter_html_is_enabled) {
      $filter_html_before = static::getFilterHtmlRestrictions($filter_format_before);
      $filter_html_after = static::getFilterHtmlRestrictions($filter_format_after);
      $this->assertTrue($filter_html_before->diff($filter_html_after)->allowsNothing());
      $this->assertTrue($filter_html_after->diff($filter_html_before)->allowsNothing());
    }

    // 4. After: text format and editor still form a valid pair.     $this->assertSame([], array_map(
      function DConstraintViolation $v) {
        return (string) $v->getMessage();
      },
      iterator_to_array(CKEditor5::validatePair($editor_after, $filter_format_after))
    ));