Should you reference getters in your test methods?

Say you have this class:

public class MyObj
{
    private int x;

    public MyObj(int x)
    {
        this.x = x; 
    }
    public void setX(int x)
    {
        this.x = x; 
    }
    public int getX()
    {
        return this.x;
    }
    public void addFive()
    {
        this.x = this.x +5;
    }

}

and we want to test it

public class MyObjTest
{
    @Test
    public void test5AddFive_equals10()
    {
         MyObj obj = new MyObj(5);
         obj.addFive();
         assertEquals(10, obj.getX());
    }
}

The question is - is ok that you're calling a getter method in order to test it? What if your getter method was (somehow) broken?