def creates_cycle(connections: list[tuple[int, int]], test: tuple[int, int]) -> bool:
    """
    Returns true if the addition of the 'test' connection would create a cycle,
    assuming that no cycle already exists in the graph represented by 'connections'.
    https://github.com/CodeReclaimers/neat-python/blob/4928381317213ee3285204ae1f2a086286aa3a10/neat/graphs.py#L4
    """

    i, o = test
    if i == o:
        return True
    
    visited = {o}
    while True:
        num_added = 0
        for a, b in connections:
            if a in visited and b not in visited:
                if b == i:
                    return True

                visited.add(b)
                num_added += 1

        if num_added == 0:
            return False