public void ChangeWritingSystemId()
{
ViewTemplate viewTemplate = PopulateViewTemplate();
viewTemplate.Fields[0].WritingSystemIds.Contains("en");
viewTemplate.OnWritingSystemIDChange("en", "x");
Assert.IsFalse(viewTemplate.Fields[0].WritingSystemIds.Contains("en"));
Assert.IsTrue(viewTemplate.Fields[0].WritingSystemIds.Contains("x"));
}