public void Remove_WritingsystemIdExists_FiresEventAndEventArgIsSetToIdOfDeletedWritingSystem()
{
RepositoryUnderTest.WritingSystemDeleted += OnWritingsystemDeleted;
var ws = new WritingSystemDefinition("en");
RepositoryUnderTest.Set(ws);
RepositoryUnderTest.Remove(ws.LanguageTag);
Assert.That(_writingSystemDeletedEventArgs.Id, Is.EqualTo(ws.LanguageTag));
}