refactoringStatics.cs

    public static class ClassToBeTested
    {
        public static void DoSomething(int input, AnotherCrazyPublicStaticClass staticClass)
        {
            var result = staticClass.MethodToBeMocked(input); // go hit the database, network, web services, file and everything else you can imagine.
            // now some business logic that I want to test
            //  400 lines of code 
            // if result is blah do x otherwise do y
            // 20 foreach loops each one with 2 nested loops and 10 if conditions.
        }
    }

    // note class is no longer static
    public class AnotherCrazyPublicStaticClass
    {
        // instance method replacing previous static MethodToBeMocked()
        public virtual int MethodToBeMocked(int input)
        {
            // go hit the database, network, web services, file and everything else you can imagine.
            return 0;
        }
    }

    public class MockCrazy : AnotherCrazyPublicStaticClass
    {
        public override int MethodToBeMocked(int input)
        {
            return 1;
        }
    }