public void DivideTest()
{
var m1 = new BaseMeasure("a");
var m2 = new BaseMeasure("b");
Measures.Instance.Add(m1);
Measures.Instance.Add(m2);
var u1 = new BaseUnit(m1, 1, "s", "pikkus");
var u2 = new BaseUnit(m2, 1, "t", "aeg");
Units.Instance.Add(u1);
Units.Instance.Add(u2);
var u = u1.Divide(u2);
Assert.AreEqual("s*t^-1", u.Formula());
Assert.AreEqual("a^1*b^-1", u.Measure.Name);
Assert.AreEqual("pikkus*aeg^-1", u.Formula(true));
}