public void TestMult()
{
int result = Calculator.Mult(3, 2);
Assert.AreEqual(6, result);
result = Calculator.Mult(0, 2);
Assert.AreEqual(0, result);
result = Calculator.Mult(12, -2);
Assert.AreEqual(-24, result);
result = Calculator.Mult(-3, -2);
Assert.AreEqual(6, result);
result = Calculator.Mult(0, 0);
Assert.AreEqual(0, result);
}