public void AddLanguage()
    {
        var expected = new List <string>();

        expected.Add("C#");
        expected.Add("Clojure");
        expected.Add("Elm");
        expected.Add("Bash");
        Assert.Equal(expected,
                     Languages.AddLanguage(Languages.GetExistingLanguages(), "Bash"));
    }
    public void AddLanguage()
    {
        var expected = new List <string>();

        expected.Add("C#");
        expected.Add("Clojure");
        expected.Add("Elm");
        expected.Add("Bash");
        var languages = new List <string>();

        languages.Add("C#");
        languages.Add("Clojure");
        languages.Add("Elm");
        Assert.Equal(expected, Languages.AddLanguage(languages, "Bash"));
    }