public void CalculateQuestionScore_OriginalQuestionIsNull_ThrowsArgumentNullException()
{
var receivedQuestion = new PayloadQuestion();
Assert.ThrowsException <ArgumentNullException>(() =>
testCalculationService.CalculateQuestionScore(originalQuestion: null, receivedQuestion: receivedQuestion));
}
public void CalculateQuestionScore_NoneOptionsSelectedAndQuestionOptionsAreNotEmpty_ReturnsZero()
{
var receivedQuestion = new PayloadQuestion {
SelectedOptionsId = new List <int> {
}
};
var expectedQuestionScore = 0;
var actualQuestionScore = testCalculationService.CalculateQuestionScore(originalQuestion: originalQuestion, receivedQuestion: receivedQuestion);
Assert.AreEqual(expected: expectedQuestionScore, actual: actualQuestionScore);
}
public void CalculateQuestionScore_MoreThanAllOptionsSelected_ReturnsNotMaximumScore()
{
var receivedQuestion = new PayloadQuestion
{
SelectedOptionsId = new List <int> {
1, 2, 3, 4
}
};
var expectedQuestionScore = 0;
var actualQuestionScore = testCalculationService.CalculateQuestionScore(originalQuestion: originalQuestion, receivedQuestion: receivedQuestion);
Assert.AreEqual(expected: expectedQuestionScore, actual: actualQuestionScore);
}
public void CalculateQuestionScore_AllOptionsSelectedWithWrong_ReturnsNotMaximumScore()
{
var receivedQuestion = new PayloadQuestion
{
SelectedOptionsId = new List <int> {
1, 2, 3
}
};
var expectedQuestionScore = 1.0;
var expectedQuestionScoreCoef = expectedQuestionScore / originalQuestion.TestQuestionOptions.Count(o => o.IsRight);
var actualQuestionScoreCoef = testCalculationService.CalculateQuestionScore(originalQuestion: originalQuestion, receivedQuestion: receivedQuestion);
Assert.AreEqual(expected: expectedQuestionScoreCoef, actual: actualQuestionScoreCoef);
}
private ResultAnswer CreateResultAnswerWithOptions(PayloadQuestion receivedQuestion, int receivedQuestionIndex, List <TestEvent> eventsQuestionAnswered, TestEvent eventTestStarted)
{
var resultAnswer = new ResultAnswer();
if (receivedQuestionIndex >= 0)
{
resultAnswer.TimeTakenSeconds = receivedQuestionIndex == 0
? eventsQuestionAnswered[receivedQuestionIndex].StartTime - eventTestStarted.StartTime
: eventsQuestionAnswered[receivedQuestionIndex].StartTime - eventsQuestionAnswered[receivedQuestionIndex - 1].StartTime;
resultAnswer.ResultAnswerOptions = receivedQuestion.SelectedOptionsId.Select(selectedOptionId => new ResultAnswerOption {
OptionId = selectedOptionId
}).ToList();
}
else
{
resultAnswer.TimeTakenSeconds = TimeSpan.Zero;
}
return(resultAnswer);
}
public double CalculateQuestionScore(TestQuestion originalQuestion, PayloadQuestion receivedQuestion)
{
if (originalQuestion == null)
{
throw new ArgumentNullException(nameof(originalQuestion));
}
if (receivedQuestion != null)
{
var rightQuestionOptions = originalQuestion.TestQuestionOptions.Where(o => o.IsRight);
int rightOptionsAmount = rightQuestionOptions.Count(), selectedRightOptionsAmount = 0;
foreach (var id in receivedQuestion.SelectedOptionsId)
{
selectedRightOptionsAmount = rightQuestionOptions.Any(o => o.Id == id) ? ++selectedRightOptionsAmount : --selectedRightOptionsAmount;
}
// Сalculate question score.
return(selectedRightOptionsAmount >= 0 ? (rightOptionsAmount == 0 && selectedRightOptionsAmount == 0 ? 1 : (double)selectedRightOptionsAmount / rightOptionsAmount) : 0);
}
return(0);
}
