public static IEnumerable <object[]> GetNotEnoughPretestsTestData()
{
//empty array
yield return(new object[] { new List <TestletItem>(), 1 });
var noPretestsSet = Enumerable.Range(0, 10)
.Select(x => new TestletItem(x.ToString(), TestletItemTypeEnum.Operational))
.ToList();
//no pretests
yield return(new object[] { noPretestsSet.ToList(), 2 });
//has pretests, but not enough
var notEnoughPretestsSet = noPretestsSet.ToList();
notEnoughPretestsSet[4] = new TestletItem("pretest1", TestletItemTypeEnum.Pretest);
yield return(new object[] { notEnoughPretestsSet.ToList(), 2 });
}
public void PretestsRandomizationAlgorithm(int totalCount, int pretestsCount, int startWithNPretests, int seed)
{
//use seed so tests are not fragile
var random = new Random(seed);
var algorithm = new SomePretestsFirstRandomization(startWithNPretests, random);
var testData = Enumerable.Range(0, totalCount)
.Select(x => new TestletItem(x.ToString(), TestletItemTypeEnum.Operational))
.ToList();
for (var i = pretestsCount - 1; i >= 0; i--)
{
testData[i] = new TestletItem("pretest" + i, TestletItemTypeEnum.Pretest);
}
var randomized = algorithm.Randomize(testData);
Assert.Equal(totalCount, randomized.Count);
Assert.True(totalCount == randomized.Distinct().Count(), "Some values are used more than once");
Assert.True(randomized.Take(startWithNPretests).All(x => x.TestletItemType == TestletItemTypeEnum.Pretest), "Doesn't start with proper number of pretests");
Assert.False(randomized.SequenceEqual(testData), "Randomized sequence equals source data");
}
