public void ResultsViewModel_IsValid_GivenSelectedID()
        {
            // Arrange
            var viewModel = new ResultsViewModel("ks4-june")
            {
                SelectedID = "12345"
            };

            var validator = new ResultsViewModelValidator();

            // Act
            var result = validator.Validate(viewModel);

            // Assert
            Assert.True(result.IsValid);
        }
        public void ResultsViewModel_IsInvalid_WithoutSelectedIDKS5()
        {
            // Arrange
            var viewModel = new ResultsViewModel("ks5")
            {
                SelectedID = null
            };

            var validator = new ResultsViewModelValidator();

            // Act
            var result = validator.Validate(viewModel);

            // Assert
            Assert.False(result.IsValid);
        }