public void GroupIf_NullGroupPredicate_ThrowsArgumentNullException()
{
IEnumerable <int> collection = Enumerable.Range(0, 10);
Func <int, int, bool> groupPredicate = null;
Assert.Throws <ArgumentNullException>(() => CollectionExtensions.GroupIf(collection, groupPredicate));
}
public void GroupIf_NullCollection_ThrowsArgumentNullException()
{
IEnumerable <int> collection = null;
Func <int, int, bool> groupPredicate = (i1, i2) => i2 == i1 + 1;
Assert.Throws <ArgumentNullException>(() => CollectionExtensions.GroupIf(collection, groupPredicate));
}
public void GroupIf_BasicRangeGrouping_ReturnsCorrectGrouping()
{
var input = new[]
{
1, 2, 3, 5, 6, 7, 9
};
var output = CollectionExtensions.GroupIf(input, (prev, current) => current == prev + 1).Select(group => $"{group.First()}-{group.Last()}").ToList();
CollectionAssert.AreEqual(new[]
{
"1-3",
"5-7",
"9-9"
}, output);
}
