public async Task Should_ReturnAll()
        {
            var words = new[]
            {
                new LearningItem("salut", new [] { "hello, goodbye" }),
                new LearningItem("maison", "house")
            };
            var mockHandler = new MockQueryHandler <FindItemsQuery, LearningItem[]>().ReturnsForAll(words).Handler;
            var controller  = new WordsController(null, mockHandler);

            var result = await controller.Words();

            result.ShouldBeEquivalentTo(words);
        }