public void Method_substruct_returns_substract_of_positive_and_negative_numbers()
{
// arrange
var math = new Mathematics();
// act
var result = math.Substract(10, -20);
// assert
Assert.Equal(30, result);
}
public void Method_substract_returns_substract_of_given_values()
{
// arrange
var math = new Mathematics();
// act
var result = math.Substract(20, 10);
// assert
Assert.Equal(10, result);
}