for _ in range(int(input())):
    n=int(input())
    b=list(map(int,input().split()))
    visited=[0]*(2*n)
    next_indices=[]
    positive=[]
    flag=0
    index=0
    for i in b:
        if(i==-1):
            index+=1
            continue
        if(i > (index+1)):
            flag=1
            break
        if(positive):
            if(i<positive[-1]):
                flag=1
                break
            if(positive[-1]!=i):
                positive.append(i)
                next_indices.append(index)
        else:
            positive.append(i)
        index+=1
        visited[i]=1
    if(flag):
        print(-1)
    else:
        res=[-1]*n
        for i in range(len(next_indices)):
            res[next_indices[i]]=positive[i]
        unused=0
        for i in range(n):
            if(res[i]!=-1):
                continue
            while(visited[unused]):
                unused+=1
            res[i]=unused
            visited[unused]=1
        print(*res)