#include<bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define mp make_pair
#define pb push_back
#define rep(i,a,n) for(int i=(a);i<=(n);++i)
#define dep(i,a,n) for(int i=(a);i>=(n);--i)
#define eps 1e-8
#define pi 3.1415926535897
#define sqr(x) ((x)*(x))
#define MAX(a,b) a=max(a,b)
#define MIN(a,b) a=min(a,b)
#define SZ(x) ((int)(x).size())
#define CPY(a,b) memcpy(a,b,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define POSIN(x,y) (1<=(x)&&(x)<=n&&1<=(y)&&(y)<=m)
#define all(x) (x).begin(),(x).end()
#define COUT(S,x) cout<<fixed<<setprecision(x)<<S<<endl
#define buli(x) (__builtin_popcountll(x))
#define bur0(x) (__builtin_ctzll(x))
#define bul2(x) (63-__builtin_clzll(x))
#define pw(x) ((ll(1))<<(x))
#define upmo(a,b) (((a)=((a)+(b))%mo)<0?(a)+=mo:(a))
#define mmo(a,b) (((a)=1ll*(a)*(b)%mo)<0?(a)+=mo:(a))
#define y0 y0z
#define y1 y1z
#define yn ynz
#define j0 j0z
#define j1 j1z
#define jn jnz
#define tm tmz
#ifdef LOCAL
#define debug(...) fprintf(stderr, __VA_ARGS__)
#else
#define debug(...) 
#endif
typedef long long ll;
typedef double lf;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef pair<lf,lf> pff;
typedef complex<double> CD;
const int inf=0x3f3f3f3f;
const int mo=1000000007;
inline void gn(long long&x){
    int sg=1;char c;while(((c=getchar())<'0'||c>'9')&&c!='-');c=='-'?(sg=-1,x=0):(x=c-'0');
    while((c=getchar())>='0'&&c<='9')x=x*10+c-'0';x*=sg;
}
inline void gn(int&x){long long t;gn(t);x=t;}
inline void gn(unsigned long long&x){long long t;gn(t);x=t;}
inline void gn(double&x){double t;scanf("%lf",&t);x=t;}
inline void gn(long double&x){double t;scanf("%lf",&t);x=t;}
template<class T1,class T2>inline void gn(T1&r,T2&s){gn(r),gn(s);}
template<class T1,class T2,class T3>inline void gn(T1&r,T2&s,T3&t){gn(r),gn(s),gn(t);}
template<class T1,class T2,class T3,class T4>inline void gn(T1&r,T2&s,T3&t,T4&u){gn(r),gn(s),gn(t),gn(u);}
inline void gs(char *s){scanf("%s",s);}
inline void gc(char &c){while((c=getchar())>126 || c<33);}
inline void pc(char c){putchar(c);}
const int DX[]={1,0,-1,0},DY[]={0,1,0,-1};
ll powmod(ll a,ll b) {ll res=1;a%=mo;for(;b;b>>=1){if(b&1)res=res*a%mo;a=a*a%mo;}return res;}
ll powmod(ll a,ll b,ll mo) {ll res=1;a%=mo;for(;b;b>>=1){if(b&1)res=res*a%mo;a=a*a%mo;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
//*******************************************

const int N=111111,M=555;
int l,m,n,t,C;
struct P{
    int x,y;
    P(){}
    P(int a,int b):x(a),y(b){}
};
pair<P,P> a[N];
P st,en;
map<int,int>Mx,My;
int px[N],py[N];
int v1[M][M],v2[M][M];
lf dis[M][M];
int vis[M][M];
lf len(int x,int y,int xx,int yy){
    // printf("%d %d %d %d %d %d %d %d\n",x,y,xx,yy,px[x],py[y],px[xx],py[yy]);
    lf ans=0;
    if(x==xx)ans=1.0*abs(py[yy]-py[y])/v2[min(x,xx)][min(y,yy)];
    else ans=1.0*abs(px[xx]-px[x])/v1[min(x,xx)][min(y,yy)];
    return ans;
}
int main(){
#ifdef LOCAL
    freopen("C.in","r",stdin);//freopen("C.out","w",stdout);
#endif
    scanf("%d",&C);rep(_,1,C){
        Mx.clear();My.clear();
        scanf("%d",&n);
        rep(i,1,n){
            scanf("%d%d%d%d",&a[i].X.x,&a[i].X.y,&a[i].Y.x,&a[i].Y.y);
            Mx[a[i].X.x]=1;
            Mx[a[i].Y.x]=1;
            My[a[i].X.y]=1;
            My[a[i].Y.y]=1;
        }
        scanf("%d%d",&st.x,&st.y);Mx[st.x]=1;My[st.y]=1;
        scanf("%d%d",&en.x,&en.y);Mx[en.x]=1;My[en.y]=1;
        int xtot=0;
        for(auto &i:Mx)px[++xtot]=i.X,i.Y=xtot;
        int ytot=0;
        for(auto &i:My)py[++ytot]=i.X,i.Y=ytot;
        rep(i,1,n)a[i].X.x=Mx[a[i].X.x];
        rep(i,1,n)a[i].X.y=My[a[i].X.y];
        rep(i,1,n)a[i].Y.x=Mx[a[i].Y.x];
        rep(i,1,n)a[i].Y.y=My[a[i].Y.y];
        st=P(Mx[st.x],My[st.y]);
        en=P(Mx[en.x],My[en.y]);
        rep(i,0,xtot+1)rep(j,0,ytot+1)v1[i][j]=v2[i][j]=1,dis[i][j]=1e30,vis[i][j]=0;
        rep(i,1,n)rep(j,a[i].X.x,a[i].Y.x-1)rep(k,a[i].X.y,a[i].Y.y)v1[j][k]++;
        rep(i,1,n)rep(j,a[i].X.x,a[i].Y.x)rep(k,a[i].X.y,a[i].Y.y-1)v2[j][k]++;
        // rep(i,1,n)val[a[i].X.x][a[i].X.y]++;
        // rep(i,1,n)val[a[i].Y.x+1][a[i].Y.y+1]++;
        // rep(i,1,n)val[a[i].X.x][a[i].Y.y+1]--;
        // rep(i,1,n)val[a[i].Y.x+1][a[i].X.y]--;
        // rep(i,1,xtot)rep(j,1,ytot)val[i][j]-=val[i-1][j-1]-val[i-1][j]-val[i][j-1];
        set<pair<lf,pii> >S;
        dis[st.x][st.y]=0;
        S.insert(mp(0,mp(st.x,st.y)));
        // rep(i,1,n)printf("%d %d %d %d\n",a[i].X.x,a[i].X.y,a[i].Y.x,a[i].Y.y);
        // rep(i,1,xtot){rep(j,1,ytot)printf("%d ",val[i][j]);puts("");}
        // printf("%d %d %d %d\n",st.x,st.y,en.x,en.y);
        while(!S.empty()){
            auto k=*(S.begin());S.erase(S.begin());
            int x=k.Y.X,y=k.Y.Y;vis[x][y]=1;
            // printf("%d %d %.9lf\n",x,y,dis[x][y]);
            rep(k,0,3){
                int xx=x+DX[k],yy=y+DY[k];
                if(1<=xx&&xx<=xtot&&1<=yy&&yy<=ytot&&!vis[xx][yy]&&dis[xx][yy]>dis[x][y]+len(x,y,xx,yy)){
                    S.erase(mp(dis[xx][yy],mp(xx,yy)));
                    dis[xx][yy]=dis[x][y]+len(x,y,xx,yy);
                    S.insert(mp(dis[xx][yy],mp(xx,yy)));
                }
            }
        }
        printf("%.5lf\n",dis[en.x][en.y]);
    }
    return 0;
}