public void GetCommonItemsTest()
{
List <int> list1 = new List <int> {
1, 2, 3, 4,
};
List <int> list2 = new List <int> {
1, 2, 3
};
List <int> list3 = new List <int> {
1, 2
};
var common = ListExtensions.GetCommonItems(new List <List <int> > {
list1, list2, list3
}).ToArray();
Assert.AreEqual(2, common.Count());
Assert.AreEqual(1, common[0]);
Assert.AreEqual(2, common[1]);
}
