feat: rng 테스트 추가

hwe/ts/util/RandUtil.ts

@@ -47,6 +47,9 @@ export class RandUtil {
         const result: T[] = Array.from(srcArray);
         for (let srcIdx = 0; srcIdx < cnt; srcIdx += 1) {
             const destIdx = this.rng.nextInt(cnt - srcIdx - 1) + srcIdx;
+            if(srcIdx === destIdx){
+                continue;
+            }
             [result[srcIdx], result[destIdx]] = [result[destIdx], result[srcIdx]];
         }