public void Return_The_Items_Concatenated_By_Separator(string item1, string item2, string separator)
{
var sut = new[] { item1, item2 };
var result = sut.Join(separator);
Check.That(result)
.Equals($"{item1}{separator}{item2}");
}
public void Return_The_Item_Given_A_Single_Non_Null_Item_List(NonNull <string> item, string separator)
{
var sut = new[] { item.Get };
var result = sut.Join(separator);
Check.That(result)
.Equals(item.Get);
}