public void Throw_ArgumentException_When_Calling_Retrieve_Questions_With_Non_Positive_Limit_Argument()
{
// Arrange
var controller = new ExamsController(GetFakeContext(), GetUserManagerMock().Object);
// Act
var positiveResult = controller.RetrieveQuestions(1, 0);
// Assert
Assert.IsAssignableFrom <List <Question> >(positiveResult);
Assert.Throws <ArgumentException>(() => controller.RetrieveQuestions(0, 0));
Assert.Throws <ArgumentException>(() => controller.RetrieveQuestions(-1, 0));
}