public async Task SearchWordTest()
{
IWordModel model = new WordModel(target);
model.AddWord("chocolate");
model.AddWord("salt");
string result = "";
SearchHandler searcher = new SearchHandler(model, (IList <string> s) => { result = s.FirstOrDefault(); return(Task.CompletedTask); }, () => Task.CompletedTask);
await searcher.Search();
Assert.Equal("chocolate", result);
}