public void AddRange_AppendsList() { var blist1 = new BList { "item1", "item2" }; var blist2 = new BList { "item3", "item4" }; blist1.AddRange(blist2); blist1.Should().HaveCount(4); blist1.Should().ContainInOrder((BString)"item1", (BString)"item2", (BString)"item3", (BString)"item4"); }