//This test verifies that an error is returned if a number is divided by zero
public void CheckDivisionError()
{
//Arrange
var num1 = "20";
var num2 = "0";
CalcOperator operation = new CalcOperator();
//Assert
Assert.Throws <DivideByZeroException>(
() => operation.Divide(num1, num2)
);
}
//This test that the Divide method outputs correctly
public void DivideOperator()
{
//Arrange
/*The num1 and num2 is a string because the Divide method receives a string
* as input and parses it into a double */
var num1 = "15";
var num2 = "16";
/*creates an instance of the CalcOperator class to enable the test access the Divide
* method*/
var operation = new CalcOperator();
var expected = 0.9375;
//Act
var actual = operation.Divide(num1, num2);
//Assert
Assert.Equal(actual, expected);
}