Creates test for Assist

src/test/moves/assist.test.ts

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+import { BattlerIndex } from "#app/battle";
+import { Stat } from "#app/enums/stat";
+import { Abilities } from "#enums/abilities";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import GameManager from "#test/utils/gameManager";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+describe("Moves - Assist", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .moveset([ Moves.SPLASH ])
+      .ability(Abilities.BALL_FETCH)
+      .battleType("single")
+      .disableCrits()
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(Moves.SPLASH);
+  });
+
+  it("should be able to use an ally's moves", async () => {
+    game.override
+      .battleType("double")
+      .moveset([ Moves.ASSIST, Moves.SKETCH, Moves.FLY, Moves.DRAGON_TAIL ]) // Populate movesets with moves Assist cannot call
+      .enemyMoveset(Moves.SWORDS_DANCE);
+    await game.classicMode.startBattle([ Species.FEEBAS, Species.SHUCKLE ]);
+    const leftPlayer = game.scene.getPlayerPokemon()!;
+
+    game.move.select(Moves.ASSIST, 0);
+    game.move.select(Moves.SKETCH, 1);
+    await game.setTurnOrder([ BattlerIndex.ENEMY, BattlerIndex.ENEMY_2, BattlerIndex.PLAYER_2, BattlerIndex.PLAYER ]);
+    // Player_2 uses Sketch, copies Swords Dance, Player_1 uses Assist, uses Player_2's Sketched Swords Dance
+    await game.toNextTurn();
+
+    expect(leftPlayer.getStatStage(Stat.ATK)).toBe(2); // Stat raised from Assist -> Swords Dance
+  });
+});