public void can_mark_the_missing_grammars()
{
var system = new FixtureModel("something");
system.AddGrammar(new Sentence {
key = "Go1", format = "Go One"
});
var overrides = new FixtureModel("something");
overrides.AddGrammar(new Sentence {
key = "Go2", format = "Go Two"
});
var combined = system.ApplyOverrides(overrides).As <FixtureModel>();
combined.FindGrammar("Go1").IsMissing.ShouldBeFalse();
combined.FindGrammar("Go2").IsMissing.ShouldBeTrue();
}