public void TestSubt()
{
// Arrange
var calc = new Calculator();
// Act
var subt = calc.Subt(5, 2);
var subt1 = calc.Subt(3, 4);
var subt2 = calc.Subt(4, 3);
// Assert
Assert.AreEqual(3, subt);
Assert.AreEqual(-1, subt1);
Assert.AreEqual(1, subt2);
}