var _keywordRepository = new List<Keyword>
    {
        new Keyword
        {
            Id = 1,
            KeywordSearches = new[]
            {
                new KeywordSearch { Name = "KeywordA" },
                new KeywordSearch { Name = "KeywordB" },
                new KeywordSearch { Name = "KeywordC" },
                new KeywordSearch { Name = "KeywordD" },
            }
        },
        new Keyword
        {
            Id = 2,
            KeywordSearches = new[]
            {
                new KeywordSearch { Name = "KeywordA" },
                new KeywordSearch { Name = "KeywordB" },
                new KeywordSearch { Name = "KeywordD" },
            }
        },
        new Keyword
        {
            Id = 3,
            KeywordSearches = new[]
            {
                new KeywordSearch { Name = "KeywordD" },
            }
        },
    };