GetDriverByName() public method

public GetDriverByName ( string name ) : IDriver
name string
return IDriver
        public void GetDriverByNameValid()
        {
            IDriver driverToFind = new Driver
                                       {
                                           FirstName = "Dave",
                                           LastName = "Grayson",
                                       };

            //Arrange
            var driverDataProvider = Substitute.For<IDriverDataProvider>();
            driverDataProvider.GetByName(driverToFind.FullName).Returns(driverToFind);

            //Act
            var driverListViewModel = new DriverModel(driverDataProvider);
            var result = driverListViewModel.GetDriverByName(driverToFind.FullName);

            //Assert
            Assert.IsNotNull(result);
            Assert.AreEqual(driverToFind.FirstName, result.FirstName);
            Assert.AreEqual(driverToFind.LastName, result.LastName);
        }
        public void GetDriverByNameEmptyName()
        {
            IDriver result = null;
            //Arrange
            var driverDataProvider = Substitute.For<IDriverDataProvider>();
            driverDataProvider.GetByName(Arg.Any<string>()).Returns(x => null);

            //Act
            var driverListViewModel = new DriverModel(driverDataProvider);

            try
            {
                result = driverListViewModel.GetDriverByName(string.Empty);
                Assert.Fail("Exception should be thrown");
            }
            catch (Exception ex)
            {
                Assert.IsTrue(ex is ArgumentException);
                Assert.AreEqual(ex.Message, "Name Cannot Be Empty");
            }

            //Assert
            Assert.IsNull(result);
        }
        public void GetDriverByNameUnknownDriver()
        {
            IDriver result = null;
            IDriver driverToFind = new Driver
            {
                FirstName = "Dave",
                LastName = "Grayson",
            };
            //Arrange
            var driverDataProvider = Substitute.For<IDriverDataProvider>();
            driverDataProvider.GetByName(driverToFind.FullName).Returns(x => null);

            //Act
            var driverListViewModel = new DriverModel(driverDataProvider);

            result = driverListViewModel.GetDriverByName(driverToFind.FullName);

            //Assert
            Assert.IsNull(result);
        }