public void BFSTest_SearchArgumentNullException()
{
// arange
List <string> key_store = new List <string> {
"you", "alice", "bob"
};
List <string> list_you = new List <string> {
"alice", "bob", "claire"
};
// act
void act() => bfs.Bfs_Search(list_you[0]);
// assert
Assert.ThrowsException <ArgumentNullException>(act);
}
