Extension method for setting non-public properties in tests

ObjectSetterExtensions.cs

public static class ObjectSetterExtensions
{
    public static TValue SetProperty<T, TValue>(this T target, Expression<Func<T, TValue>> property, TValue value)
    {
        var propertyName = property.GetPropertyName();
        var propertySetter = typeof (T).GetProperty(propertyName).GetSetMethod(true);

        propertySetter.Invoke(target, BindingFlags.NonPublic, null, new object[] {value}, null);

        return value;
    }
}

public static class ExpressionExtensions
{
    public static string GetPropertyName<TModel, TProperty>(this Expression<Func<TModel, TProperty>> expression)
    {
        var body = expression.Body as MemberExpression;
        return body.Member.Name;
    }
}