test(test): add expected-output checks for cases

test/test_case/29_break.sy

@@ -0,0 +1,15 @@
+//test break
+int main(){
+    int i;
+    i = 0;
+    int sum;
+    sum = 0;
+    while(i < 100){
+        if(i == 50){
+            break;
+        }
+        sum = sum + i;
+        i = i + 1;
+    }
+    return sum;
+}