public OverridableOptionsTests()
{
_theme = new OverridableOption<byte, string>(0, "default", v => v[v.Keys.Max()]);
var t = new OverridableOption<Sources,string>(Sources.Default, "default", v => v[v.Keys.Max()]);
t.FromSource(Sources.Request, "fr");
t.FromSource(Sources.UserPrefs, "de");
var b = t.Value;
}