diff --git a/grpc/tests/GameFactory.java b/grpc/tests/GameFactory.java
new file mode 100644
index 0000000..520ae39
--- /dev/null
+++ b/grpc/tests/GameFactory.java
@@ -0,0 +1,42 @@
+import java.nio.ByteBuffer;
+import MyGame.Example.Monster;
+import MyGame.Example.Stat;
+import com.google.flatbuffers.FlatBufferBuilder;
+
+class GameFactory {
+  public static Monster createMonster(String monsterName, short nestedMonsterHp, short nestedMonsterMana) {
+    FlatBufferBuilder builder = new FlatBufferBuilder();
+
+    int name_offset = builder.createString(monsterName);
+    Monster.startMonster(builder);
+    Monster.addName(builder, name_offset);
+    Monster.addHp(builder, nestedMonsterHp);
+    Monster.addMana(builder, nestedMonsterMana);
+    int monster_offset = Monster.endMonster(builder);
+    Monster.finishMonsterBuffer(builder, monster_offset);
+
+    ByteBuffer buffer = builder.dataBuffer();
+    Monster monster = Monster.getRootAsMonster(buffer);
+    return monster;
+  }
+
+  public static Monster createMonsterFromStat(Stat stat, int seqNo) {
+    FlatBufferBuilder builder = new FlatBufferBuilder();
+    int name_offset = builder.createString(stat.id() + " No." + seqNo);
+    Monster.startMonster(builder);
+    Monster.addName(builder, name_offset);
+    int monster_offset = Monster.endMonster(builder);
+    Monster.finishMonsterBuffer(builder, monster_offset);
+    Monster monster = Monster.getRootAsMonster(builder.dataBuffer());
+    return monster;
+  }
+
+  public static Stat createStat(String greeting, long val, int count) { 
+    FlatBufferBuilder builder = new FlatBufferBuilder();
+    int statOffset = Stat.createStat(builder, builder.createString(greeting), val, count);
+    builder.finish(statOffset);
+    Stat stat = Stat.getRootAsStat(builder.dataBuffer());
+    return stat;
+  }
+
+}