public async void ExistsAsyncTest(bool result) { _api.SetResult($"{{result: {result.ToString().ToLower()}}}"); Assert.Equal( result, await _collectionController.ExistsAsync("foo", "bar")); _api.Verify(new JObject { { "controller", "collection" }, { "action", "exists" }, { "index", "foo" }, { "collection", "bar" } }); }