public void StaticTests()
{
Assert.AreEqual(Kalkulator.BasicOp('+', 4, 7), 11);
Assert.AreEqual(Kalkulator.BasicOp('-', 15, 18), -3);
Assert.AreEqual(Kalkulator.BasicOp('*', 5, 5), 25);
Assert.AreEqual(Kalkulator.BasicOp('/', 49, 7), 7);
}