message: stop using method that was recently removed
  (Why did TS compile that call to a non-existant method?)
diff: @@ -313,7 +313,7 @@ export class IModelTestUtils {
  // Create a SpatialCategory, insert it, and set its default appearance
  public static createAndInsertSpatialCategory(definitionModel: DefinitionModel, categoryName: string, appearance: Appearance): Id64 {
  const cat: SpatialCategory = SpatialCategory.create(definitionModel, categoryName);
  - cat.id = cat.insert();
  + cat.id = definitionModel.iModel.elements.insertElement(cat);
  cat.setDefaultAppearance(appearance);
  return cat.id;
  }
  