Assign to a getter-only auto property

Program.cs

using System;
using System.Reflection;

public static class Program
{
    public static void Main()
    {
        var test = new T();

        var testType = test.GetType();

        var property = testType.GetProperty("Test");

        FieldInfo backingField;
        if (!property.CanWrite && property.TryGetBackingField(out backingField))
        {
            backingField.SetValue(test, "It's working!");
        }

        Console.WriteLine(test.Test);
    }

    private static bool TryGetBackingField(this PropertyInfo property, out FieldInfo field)
    {
        var declaringType = property.DeclaringType;
        if (declaringType == null)
        {
            field = null;
            return false;
        }

        field = declaringType.GetField($"<{property.Name}>k__BackingField", BindingFlags.NonPublic | BindingFlags.Instance);
        return field != null;
    }

    private class T
    {
        public string Test { get; }
    }
}