public void Test()
{
var config = new FakeConfig(new Dictionary <string, string> {
["int"] = "3", ["double"] = "abc", ["array"] = "1,2,3",
});
Assert.Equal(3, config.GetProperty("int", new int?()));
Assert.Equal(3d, config.GetProperty("double", 3d));
var array = config.GetProperty("array", ",", Array.Empty <string>());
Assert.NotNull(array);
Assert.Equal(new[] { "1", "2", "3" }, array);
}