testWriteHttpsInitialIframeContent() {
    // This is not a particularly useful test; it's just a sanity check to make
    // sure nothing explodes
    const info = new FieldFormatInfo('id', false, false, false);
    const doc = createMockDocument();
    icontent.writeHttpsInitialIframe(info, doc, 'some html');
    assertBodyCorrect(doc.body, 'id', 'some html');
  }
@suppress {checkTypes,strictMissingProperties} suppression added to enable
     type checking