public void AddNumberAndTwoDigitNumberReturnsException()
 {
     //Arrange
     var c = new Calc();
     //Act
     var actual = c.Add(5, 15);
     //Assert - expects exception
 }
 public void AddZeroAndZeroReturnsZero()
 {
     //Arrange
     var c = new Calc();
     const int expected = 0;
     //Act
     var actual = c.Add(0, 0);
     //Assert
     Assert.AreEqual(expected, actual);
 }
 public void AddZeroAndNumberReturnsNumber()
 {
     //Arrange
     var c = new Calc();
     const int expected = 5;
     //Act
     var actual = c.Add(0, expected);
     //Assert
     Assert.AreEqual(expected, actual);
 }
 public void AddNumberAndNumberReturnsSum()
 {
     //Arrange
     var c = new Calc();
     const int expected = 10;
     //Act
     var actual = c.Add(5, 5);
     //Assert
     Assert.AreEqual(expected, actual);
 }