Replicate logic or using existent in tests?

I have some concerns about writing too much logic in the spec tests.

So let's assume we have a student with statuses and steps

Student statuses starts from

pending -> learning -> graduated -> completed

and steps are:

nil -> learning_step1 -> learning_step2 -> learning_step3 -> monitoring_step1 -> monitoring_step2

With each step going forward a lot of things are happening depending where you are: e.g.

nil -> learning_step1

Student status changes to learning Writes an action history ( which is used by report stats ) Update a contact schedule

learning_step1 -> learning_step2

....the same...

and so ..... until

learning_step3 -> monitoring_step1

Student status changes to graduated Writes different action histories ( which is used by report stats ) Update a contact schedule

and when

monitoring_step2 -> there is no next step

Student status changes to completed Writes different action histories ( which is used by report stats ) Delete any contact schedule

So imagine that I need a test case of a completed student, I would have to think all the possibilities that may come and achieve that student as completed and also I can forget to write an action history and will mess with the reports.

Or ....

Using an already implemented class:

# assuming we have like in the above example 5 steps I do

StepManager.new(student).proceed # goes status learning and step1
StepManager.new(student).proceed
StepManager.new(student).proceed
StepManager.new(student).proceed # goes status graduated and monitoring1
StepManager.new(student).proceed # this will proceed the student in the 5th step which is monitoring2
StepManager.new(student).next_step # here will go completed

or to make my job easier with something like:

StepManager.new(student).proceed.proceed.proceed.proceed.proceed.proceed

or

StepManager.new(student).complete_student # which in background does the same thing

And by doing that I am sure I will never miss something. But then the tests wouldn't be so clear about what I am doing.

So should I replicate the logic or using my classes?