public void WhenHighlihtsFound_ThenExtractTagSuggestion()
        {
            var highlights = new[]
            {
                "<em>Francis</em> says that this is it",
                "what <em>Jason</em> says is not right",
                "<em>Jonas</em>",
                "this is what <em>Eve</em> told <em>Eric</em>"
            };

            var result = ContentService.ExtractTagSuggestion(highlights);

            result.Should().NotBeNull();
            result.Should().BeEquivalentTo(new [] { "Francis", "Jason", "Jonas", "Eve", "Eric" });
        }