MVC Reflection based checking of attributes

TestMVC.cs

// Put this in a unit test

var query = Assembly.Load("MyMVCProjectAssemblyName")
    .GetTypes()
    .Where(x => x.Name.EndsWith("Controller"))
    .Where(x => !x.IsAbstract)
    .Select(x => new
    {
        Name = x.Name.Substring(0, x.Name.Length - 10),
        Type = x,
        Namespace = x.Namespace,
        RouteAttribute = x.GetCustomAttribute<RoutePrefixAttribute>()
    })
    .ToList();
    
// Now you can perform different tests on the results,
// e.g. you could ensure that each Controller is decorated with Attribute
Assert.IsTrue(query.All(x => RouteAttribute != null));

// Or you could try to validate Route Attribute against Namespace
Assert.IsTrue(query.All(x => x.Namespace.Contains($".{x.RouteAttribute.Prefix}.")));