public void IllegalIds_AreFixed()
{
var book = SetupBookLong("This is some text", "xyz", parentDivId:"12");
MakeEpub("output", "IllegalIds_AreFixed", book);
CheckBasicsInManifest();
CheckBasicsInPage();
// This is possibly too strong; see comment where we remove them.
AssertThatXmlIn.String(_page1Data).HasAtLeastOneMatchForXpath("//div[@id='i12']");
}