public void WhenNoItemsAndNoDate_ReturnsNull()
{
var items = ImmutableArray <TestSummaryItem> .Empty;
var actual = SummaryMapper.GetLastAndPreviousItem(null, items, i => true);
Assert.That(actual, Is.Null);
}
public void WhenItemWithMatchingDateExistsAndNoPrevious_ReturnsPreviousAsNull()
{
var items = ImmutableArray <TestSummaryItem> .Empty
.Add(new TestSummaryItem(2020, 12, 18));
var actual = SummaryMapper.GetLastAndPreviousItem(new DateTime(2020, 12, 18), items, i => true);
Assert.That(actual.Value.Previous, Is.Null);
}
public void WhenOnlySingleItemExistsAndNoDate_ReturnsLastAsLastItem()
{
var items = ImmutableArray <TestSummaryItem> .Empty
.Add(new TestSummaryItem(2020, 12, 18));
var actual = SummaryMapper.GetLastAndPreviousItem(null, items, i => true);
Assert.That(actual.Value.Last, Is.SameAs(items[0]));
}
public void WhenAtLeastTwoItemsExistAndNoDate_ReturnsPreviousCorrectly()
{
var items = ImmutableArray <TestSummaryItem> .Empty
.Add(new TestSummaryItem(2020, 12, 17))
.Add(new TestSummaryItem(2020, 12, 18));
var actual = SummaryMapper.GetLastAndPreviousItem(null, items, i => true);
Assert.That(actual.Value.Previous, Is.SameAs(items[0]));
}
