public void RationalAllocate()
 {
     using (var a = HugeRational.Allocate(129, 193))
     {
         Assert.AreEqual(1 + 128 / MpirSettings.BITS_PER_LIMB, a.NumeratorNumberOfLimbsAllocated());
         Assert.AreEqual(0, a.NumeratorNumberOfLimbsUsed());
         Assert.AreEqual(1 + 192 / MpirSettings.BITS_PER_LIMB, a.DenominatorNumberOfLimbsAllocated());
         Assert.AreEqual(1, a.DenominatorNumberOfLimbsUsed());
         Assert.AreEqual("0/1", a.ToString());
     }
 }