#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <set>
#include <map>
#include <queue>
#include<stack>
#include<bitset>
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstring>
#include <cctype>
#include <cassert>
#include <limits>
#include <functional>
#include<unordered_map>
#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
#define aut(r,v) for(auto r:v)
#define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it)
#define all(o) (o).begin(), (o).end()
#define pb(x) push_back(x)
#define pc() pop_back()
#define ull unsigned long long
#define mp(x,y) make_pair((x),(y))
#define mset(m,v) memset(m,v,sizeof(m))
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
using namespace std;
#define ll long long
#define endl '\n'
#define st stack<int>
#define vl vector<long long>
#define vi vector<int>
#define vb vector<bool>
#define vc vector<char>
#define pii pair<int,int>
#define vpii vector<pii>
#define vvi vector<vi>
#define vs vector<string>
#define mod 1000000007
#define un unordered_map<int,int>
#define mii map<int,int>
#define Sort(a) sort(all(a))
#define ED(a) Sort(a), a.erase(unique(all(a)), a.end())//removing all duplicates
#define max3(a, b, c) max(a, max(b, c))
#define min3(a, b, c) min(a, min(b, c))
#define Max(a) *max_element(all(a))
#define Min(a) *min_element(all(a))
#define MaxP(a) max_element(all(a)) - a.begin()
#define MinP(a) min_element(all(a)) - a.begin()
#define allUpper(a) transform(all(a), a.begin(), :: toupper)
#define allLower(a) transform(all(a), a.begin(), :: tolower)
#define rev(a) reverse(all(a))
#define ub(v,k) upper_bound(all(v), k) - v.begin()
#define lb(v,k) lower_bound(all(v), k) - v.begin()
#define adv(a,n) advance(auto it:a,n)
#define RSort(a) sort(a.rbegin(),a.rend()) //decending order
#define cnt(v,a) count(all(v),a)
#define bs(v,a) binary_search(all(v),a)
#define mmax(v) *max_element(all(v))
#define mmin(v) *min_element(all(v))
#define popcount(mask) __builtin_popcount(mask) // count set bit
#define popcountLL(mask) __builtin_popcountll(mask) // for long long
#define X real() // useful for working with #include <complex> for computational geometry
#define Y imag()
#define ss second
#define ff first
#define trace1(x) cerr << #x << ": " << x << endl;
#define trace2(x, y) cerr << #x << ": " << x << " | " << #y << ": " << y << endl;
#define trace3(x, y, z) cerr << #x << ": " << x << " | " << #y << ": " << y << " | " << #z << ": " << z << endl;
#define trace4(a, b, c, d) cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << endl;
#define trace5(a, b, c, d, e) cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << endl;
#define trace6(a, b, c, d, e, f) cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << " | " << #f << ": " << f << endl;
template <typename T> T gcd(T a, T b) { while (b) b ^= a ^= b ^= a %= b; return a; }
template <typename T> T setbit(T mask, T pos) { return mask |= (1 << pos); }
template <typename T> T resetbit(T mask, T pos) { return mask &= ~(1 << pos); }
template <typename T> T togglebit(T mask, T pos) { return mask ^= (1 << pos); }
template <typename T> T checkbit(T mask, T pos) { return (bool)(mask & (1 << pos)); }
template <typename T> T lcm(T a, T b) { return (a / gcd(a, b)) * b; }
template <typename T> T modu(T a, T b) { return (a < b ? a : a % b); }
template<typename T> T mod_neg(T a, T b) { a = mod(a, b); if (a < 0) { a += b; } return a; }
template <typename T>T expo(T e, T n) { T x = 1, p = e; while (n) { if (n & 1)x = x * p; p = p * p; n >>= 1; } return x; }
template<typename T> T mod_inverse(T a, T n) { T x, y; T d = extended_euclid(a, n, x, y); return (d > 1 ? -1 : mod_neg(x, n)); }
template <typename T>T power(T e, T n, T m) { T x = 1, p = e; while (n) { if (n & 1)x = mod(x * p, m); p = mod(p * p, m); n >>= 1; } return x; }
template <typename T>T powerL(T e, T n, T m) { T x = 1, p = e; while (n) { if (n & 1)x = mulmod(x, p, m); p = mulmod(p, p, m); n >>= 1; } return x; }
bool Pow2(int n) {
return n && (!(n & (n - 1)));
}
void printc(vc& result) {
aut(r, result) cout << r << " ";
cout << endl;
}
void printl(vl& result) {
aut(r, result) cout << r << " ";
cout << endl;
}
void print(vi& result) {
aut(r, result) cout << r << " ";
cout << endl;
}
bool comp(pair<ll, ll>p1, pair<ll, ll>p2) { return p1.second < p2.second; }
bool isPrime(int n)
{
// Corner cases
if (n <= 1) return false;
if (n <= 3) return true;
// This is checked so that we can skip
// middle five numbers in below loop
if (n % 2 == 0 || n % 3 == 0) return false;
for (int i = 5; i * i <= n; i = i + 6)
if (n % i == 0 || n % (i + 2) == 0)
return false;
return true;
}
ll power(ll a, ll b) {
if (a == 1)
return 1;
if (b == 0)
return 1;
ll c = power(a, b / 2);
ll res = 1;
if (b % 2) {
res = (c * c) % mod;
res *= a;
res %= mod;
}
else
res = ((c * c) % mod);
return res;
}
ll modInv(ll a) { return power(a, mod - 2) % mod; }
ll fact[1], inv[1];
void factorial(ll n) {
fact[0] = 1;
for (ll i = 1; i <= n; i++) {
fact[i] = fact[i - 1] * i;
fact[i] %= mod;
}
}
void InvFactorial(ll n) {
inv[0] = 1;
for (ll i = 1; i <= n; i++)
inv[i] = modInv(fact[i]);
}
ll ncr(ll n, ll r) {
if (n < r || n < 0 || r < 0)
return 0;
ll b = inv[n - r];
ll c = inv[r];
ll a = fact[n] * b;
a %= mod;
a *= c;
a %= mod;
return a;
}
//ifstream cin("b_read_on.txt"); ofstream cout("output3.txt");
//Use (<<) for multiplication
//Use (>>) for division
//ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);cout<<fixed;cerr.tie(NULL);
// find_by_order -> value at index
// order_of_key -> index of value
// while using (1<<i) use ((ll)1<<(ll)i)
// in Floyd-Warshall Algo, k is outer loop
// If an element was not initially in map and if asked mp[a],the element gets inserted
// a%=mod take a lot of time... try to use it minimum and use memset as it reduces a lot of time usage...use if(a>=mod) a%=mod
//cout<<(double) can be harmful , always use printf(%.9llf)...take scanf("%lf",&p[i][j]) as input , not llf;
//use s.erase(it++) for erasing iterator and then moving to the next one
//never use adj.resize(n) as value is persistent, always erase
//use __builtin_popcountll() for ll
// no of prime numbers in range : (70,19) , (1000,168) , (100000,1229) , (sqrt(10^9),3409) ;
//always check the use of segment tree using bottom-up dp
/*
Try the solution
10^8 O(N) Border case
10^7 O(N) Might be accepted
10^6 O(N) Perfect
10^5 O(N * logN)
10^3 O(N ^ 2)
10^2 O(N ^ 3)
10^9 O(logN) or Sqrt(N)
*/
vi par(1000001, -1);
vi ran(1000001, 1);
int find(int a) {
if (par[a] < 0) return a;
return par[a] = find(par[a]);
}
void uni(int a, int b) {
if (ran[a] > ran[b]) {
par[b] = a;
ran[a] += ran[b];
}
else {
par[a] = b;
ran[b] += ran[a];
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int test;
//test = 1;
cin >> test;
while (test--) {
int n, e;
cin >> n >> e;
int flag = 0;
while (e--) {
int n1, n2;
string c;
cin >> n1 >> c >> n2;
n1 = find(n1);
n2 = find(n2);
if (n1 == n2 && c == "!=") {
flag = 1;
}
else if (n1 != n2 && c == "=") uni(n1, n2);
}
if (flag ) cout << "NO" << endl;
else cout << "YES" << endl;
}
}
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <set>
#include <map>
#include <queue>

#include<stack>
#include<bitset>
#include <iostream>
#include <sstream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstring>
#include <cctype>
#include <cassert>
#include <limits>
#include <functional>
#include<unordered_map>

#define rep(i,n) for(int (i)=0;(i)<(int)(n);++(i))
#define rer(i,l,u) for(int (i)=(int)(l);(i)<=(int)(u);++(i))
#define reu(i,l,u) for(int (i)=(int)(l);(i)<(int)(u);++(i))
#define aut(r,v) for(auto r:v)

#define each(it,o) for(aut(it, (o).begin()); it != (o).end(); ++ it)
#define all(o) (o).begin(), (o).end()
#define pb(x) push_back(x)
#define pc()  pop_back()

#define ull unsigned long long
#define mp(x,y) make_pair((x),(y))
#define mset(m,v) memset(m,v,sizeof(m))

#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3fLL
using namespace std;
#define ll long long
#define endl '\n'

#define st stack<int>



#define vl vector<long long>
#define vi vector<int>
#define vb vector<bool>
#define vc vector<char>
#define pii pair<int,int>
#define vpii vector<pii>
#define vvi vector<vi>
#define vs vector<string>

#define mod 1000000007

#define un  unordered_map<int,int>
#define mii map<int,int>

#define Sort(a) sort(all(a))
#define ED(a) Sort(a), a.erase(unique(all(a)), a.end())//removing all duplicates

#define max3(a, b, c)   max(a, max(b, c))
#define min3(a, b, c)   min(a, min(b, c))
#define Max(a)       *max_element(all(a))
#define Min(a)       *min_element(all(a))
#define MaxP(a)       max_element(all(a)) - a.begin()
#define MinP(a)        min_element(all(a)) - a.begin()

#define allUpper(a)     transform(all(a), a.begin(), :: toupper)
#define allLower(a)     transform(all(a), a.begin(), :: tolower)

#define rev(a)          reverse(all(a))
#define ub(v,k)          upper_bound(all(v), k) - v.begin()
#define lb(v,k)          lower_bound(all(v), k) - v.begin()
#define adv(a,n)        advance(auto it:a,n)
#define RSort(a)         sort(a.rbegin(),a.rend()) //decending order
#define cnt(v,a)             count(all(v),a)
#define bs(v,a)           binary_search(all(v),a)
#define mmax(v)           *max_element(all(v))
#define mmin(v)           *min_element(all(v))
#define popcount(mask)                       __builtin_popcount(mask) // count set bit
#define popcountLL(mask)                     __builtin_popcountll(mask) // for long long
#define X real() // useful for working with #include <complex> for computational geometry
#define Y imag()

#define ss second
#define ff first

#define trace1(x)                           cerr << #x << ": " << x << endl;
#define trace2(x, y)                        cerr << #x << ": " << x << " | " << #y << ": " << y << endl;
#define trace3(x, y, z)                     cerr << #x << ": " << x << " | " << #y << ": " << y << " | " << #z << ": " << z << endl;
#define trace4(a, b, c, d)                  cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << endl;
#define trace5(a, b, c, d, e)               cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << endl;
#define trace6(a, b, c, d, e, f)            cerr << #a << ": " << a << " | " << #b << ": " << b << " | " << #c << ": " << c << " | " << #d << ": " << d << " | " << #e << ": " << e << " | " << #f << ": " << f << endl;

template <typename T> T gcd(T a, T b) { while (b) b ^= a ^= b ^= a %= b; return a; }
template <typename T> T setbit(T mask, T pos) { return mask |= (1 << pos); }
template <typename T> T resetbit(T mask, T pos) { return mask &= ~(1 << pos); }
template <typename T> T togglebit(T mask, T pos) { return mask ^= (1 << pos); }
template <typename T> T checkbit(T mask, T pos) { return (bool)(mask & (1 << pos)); }
template <typename T> T lcm(T a, T b) { return (a / gcd(a, b)) * b; }



template <typename T> T modu(T a, T b) { return (a < b ? a : a % b); }
template<typename T> T mod_neg(T a, T b) { a = mod(a, b); if (a < 0) { a += b; } return a; }

template <typename T>T expo(T e, T n) { T x = 1, p = e; while (n) { if (n & 1)x = x * p; p = p * p; n >>= 1; } return x; }
template<typename T> T mod_inverse(T a, T n) { T x, y; T d = extended_euclid(a, n, x, y); return (d > 1 ? -1 : mod_neg(x, n)); }

template <typename T>T power(T e, T n, T m) { T x = 1, p = e; while (n) { if (n & 1)x = mod(x * p, m); p = mod(p * p, m); n >>= 1; } return x; }
template <typename T>T powerL(T e, T n, T m) { T x = 1, p = e; while (n) { if (n & 1)x = mulmod(x, p, m); p = mulmod(p, p, m); n >>= 1; } return x; }

bool Pow2(int n) {
    return n && (!(n & (n - 1)));
}
void printc(vc& result) {
    aut(r, result) cout << r << " ";
    cout << endl;
}
void printl(vl& result) {
    aut(r, result) cout << r << " ";
    cout << endl;
}
void print(vi& result) {
    aut(r, result) cout << r << " ";
    cout << endl;
}
bool comp(pair<ll, ll>p1, pair<ll, ll>p2) { return p1.second < p2.second; }
bool isPrime(int n)
{
    // Corner cases 
    if (n <= 1)  return false;
    if (n <= 3)  return true;

    // This is checked so that we can skip  
    // middle five numbers in below loop 
    if (n % 2 == 0 || n % 3 == 0) return false;

    for (int i = 5; i * i <= n; i = i + 6)
        if (n % i == 0 || n % (i + 2) == 0)
            return false;

    return true;
}
ll power(ll a, ll b) {
    if (a == 1)
        return 1;
    if (b == 0)
        return 1;
    ll c = power(a, b / 2);
    ll res = 1;
    if (b % 2) {
        res = (c * c) % mod;
        res *= a;
        res %= mod;
    }
    else
        res = ((c * c) % mod);
    return res;
}
ll modInv(ll a) { return power(a, mod - 2) % mod; }
ll fact[1], inv[1];
void factorial(ll n) {
    fact[0] = 1;
    for (ll i = 1; i <= n; i++) {
        fact[i] = fact[i - 1] * i;
        fact[i] %= mod;
    }
}
void InvFactorial(ll n) {
    inv[0] = 1;
    for (ll i = 1; i <= n; i++)
        inv[i] = modInv(fact[i]);
}
ll ncr(ll n, ll r) {
    if (n < r || n < 0 || r < 0)
        return 0;
    ll b = inv[n - r];
    ll c = inv[r];
    ll a = fact[n] * b;
    a %= mod;
    a *= c;
    a %= mod;
    return a;
}
//ifstream cin("b_read_on.txt"); ofstream cout("output3.txt");
//Use (<<) for multiplication
//Use (>>) for division
//ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);cout<<fixed;cerr.tie(NULL);
// find_by_order -> value at index
// order_of_key -> index of value
// while using (1<<i) use ((ll)1<<(ll)i) 
// in Floyd-Warshall Algo, k is outer loop 
// If an element was not initially in map and if asked mp[a],the element gets inserted 
// a%=mod take a lot of time... try to use it minimum and use memset as it reduces a lot of time usage...use if(a>=mod) a%=mod
//cout<<(double) can be harmful , always use printf(%.9llf)...take scanf("%lf",&p[i][j]) as input , not llf;
//use s.erase(it++) for erasing iterator and then moving to the next one
//never use adj.resize(n) as value is persistent, always erase
//use __builtin_popcountll() for ll
// no of prime numbers in range : (70,19) , (1000,168) , (100000,1229) , (sqrt(10^9),3409) ;
//always check the use of segment tree using bottom-up dp
/*
   Try the solution

   10^8                              O(N) Border case
   10^7                         O(N) Might be accepted
   10^6                              O(N) Perfect
   10^5                              O(N * logN)
   10^3                              O(N ^ 2)
   10^2                              O(N ^ 3)
   10^9                              O(logN) or Sqrt(N)

*/
vi par(1000001, -1);
vi ran(1000001, 1);
int find(int a) {
    if (par[a] < 0) return a;
    return par[a] = find(par[a]);
}
void uni(int a, int b) {
    if (ran[a] > ran[b]) {
        par[b] = a;
        ran[a] += ran[b];
    }
    else {
        par[a] = b;
        ran[b] += ran[a];
    }


}


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int test;
    //test = 1;
    cin >> test;
    
    while (test--) {
        int n, e;
        cin >> n >> e;
        int flag = 0;
        while (e--) {
            int n1, n2;
            string c;
            cin >> n1 >> c >> n2;
            n1 = find(n1);
            n2 = find(n2);
            
            if (n1 == n2 && c == "!=") {
                flag = 1;
            }
            else if (n1 != n2 && c == "=") uni(n1, n2);
           


        }
        if (flag ) cout << "NO" << endl;
        else cout << "YES" << endl;

        
    }

}









