public void Randomize_ShouldGenerateDifferentSequencesEveryTime()
{
target = new Testlet("testlet", items);
var firstResult = target.Randomize();
var secondResult = target.Randomize();
Assert.False(firstResult.SequenceEqual(secondResult));
}
public void Randomize_ShouldGenerateSequenceWithCorrectOrder()
{
target = new Testlet("testlet", items);
var result = target.Randomize();
Assert.True(items.All(item => result.Contains(item)));
var resultItemsWithPredefinedPosition = result.Take(TestletConstants.NumberOfPretestItemsWithPredefinedPosition);
Assert.True(resultItemsWithPredefinedPosition.All(item => item.ItemType == ItemTypeEnum.Pretest));
var remainingItems = items.Skip(TestletConstants.NumberOfPretestItemsWithPredefinedPosition);
var remainingResultItems = result.Skip(TestletConstants.NumberOfPretestItemsWithPredefinedPosition);
Assert.False(remainingItems.SequenceEqual(remainingResultItems));
}
public void Randomize_WorksWithTooSmallCollection()
{
var sourceItems = new List <Item>
{
new Item {
ItemId = "item 1", ItemType = ItemTypeEnum.Operational
},
new Item {
ItemId = "item 2", ItemType = ItemTypeEnum.Pretest
}
};
target = new Testlet("testlet", sourceItems);
target.Randomize();
// Items should be shuffled, but for just 2 elements result of randomize will often produce the same sequence
// That's why only check that it works without exceptions
Assert.Pass();
}
public void Randomize_WorksWithEmptyItemsList()
{
target = new Testlet("testlet", new List <Item>());
target.Randomize();
Assert.Pass();
}
