[TestFixture]
    public class Execute_Should
    {
        [Test]
        public void ThrowArgumentException_WhenPassedCourseFormIsInvalid()
        {
            var engineMock = new Mock<IEngine>();
            var factoryMock = new Mock<IAcademyFactory>();
            var studentMock = new Mock<IStudent>();
            var seasonMock = new Mock<ISeason>();
            var courseMock = new Mock<ICourse>();

            studentMock.SetupGet(x => x.Username).Returns("Pesho");
            engineMock.SetupGet(x => x.Students).Returns(new List<IStudent>() { studentMock.Object });

            seasonMock.SetupGet(x => x.Students).Returns(new List<IStudent>() { studentMock.Object });
            engineMock.SetupGet(x => x.Seasons).Returns(new List<ISeason>() { seasonMock.Object });

            courseMock.SetupGet(x => x.OnlineStudents).Returns(new List<IStudent>() { studentMock.Object });
            seasonMock.SetupGet(x => x.Courses).Returns(new List<ICourse>() { courseMock.Object });

            var addStudentToCourse = new AddStudentToCourseCommand(factoryMock.Object, engineMock.Object);

            var parameters = new List<string>() { "Pesho", "0", "0", "no valid form" };

            //Act and Assert
            Assert.Throws<ArgumentException>(() => addStudentToCourse.Execute(parameters));
        }
    }