Call other methods inside a test?

I am writing some tests at the moment and was wondering if my tests should have dependencies to other methods or duplicated code. Here is a simple example what I mean:

class MyClass{
  myArray

  initArray(){
     //initilize myArray
  }

  doStuffWithArray(){
     //do Stuff with the values of myArray
  }
}

Tests:

initArrayTest(){
  //test initArray
}

//Option 1:
doStuffWithArrayTest(){
  initArray();
  //test doStuffWithArray();
}

//Option 2:
doStuffWithArrayTest(){
  //init Array myself
  //test doStuffWithArray();
}

I have to choose to duplicate my code or to have a dependency to another method which I normally don't need. Maybe this problem looks a bit pointless but imagine the methods have 10 lines of code +. And it would be nice if you don't focus on this specific code and furthermore try to understand the problem in a real project. I Hope you guys get my point.