diff --git a/src/test/field/pokemon.test.ts b/src/test/field/pokemon.test.ts
index d597cd5219c..ae8d7984828 100644
--- a/src/test/field/pokemon.test.ts
+++ b/src/test/field/pokemon.test.ts
@@ -1,6 +1,8 @@
 import { Species } from "#app/enums/species";
 import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
 import GameManager from "../utils/gameManager";
+import { PokeballType } from "#app/enums/pokeball.js";
+import BattleScene from "#app/battle-scene.js";
 
 describe("Spec - Pokemon", () => {
   let phaserGame: Phaser.Game;
@@ -28,4 +30,37 @@ describe("Spec - Pokemon", () => {
 
     expect(pkm.trySetStatus(undefined)).toBe(true);
   });
+
+  describe("Add To Party", () => {
+    let scene: BattleScene;
+
+    beforeEach(async () => {
+      game.override.enemySpecies(Species.ZUBAT);
+      await game.classicMode.runToSummon([Species.ABRA, Species.ABRA, Species.ABRA, Species.ABRA, Species.ABRA]); // 5 Abra, only 1 slot left
+      scene = game.scene;
+    });
+
+    it("should append a new pokemon by default", async () => {
+      const zubat = scene.getEnemyPokemon()!;
+      zubat.addToParty(PokeballType.LUXURY_BALL);
+
+      const party = scene.getParty();
+      expect(party).toHaveLength(6);
+      party.forEach((pkm, index) =>{
+        expect(pkm.species.speciesId).toBe(index === 5 ? Species.ZUBAT : Species.ABRA);
+      });
+    });
+
+    it("should put a new pokemon into the passed slotIndex", async () => {
+      const slotIndex = 1;
+      const zubat = scene.getEnemyPokemon()!;
+      zubat.addToParty(PokeballType.LUXURY_BALL, slotIndex);
+
+      const party = scene.getParty();
+      expect(party).toHaveLength(6);
+      party.forEach((pkm, index) =>{
+        expect(pkm.species.speciesId).toBe(index === slotIndex ? Species.ZUBAT : Species.ABRA);
+      });
+    });
+  });
 });