Add tests for skill swap

src/test/moves/skill_swap.test.ts

@@ -0,0 +1,56 @@
+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 - Skill Swap", () => {
+  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, Moves.SKILL_SWAP ])
+      .ability(Abilities.BALL_FETCH)
+      .battleType("single")
+      .disableCrits()
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(Moves.SPLASH);
+  });
+
+  it("should swap the two abilities", async () => {
+    game.override.ability(Abilities.ADAPTABILITY);
+    await game.classicMode.startBattle([ Species.FEEBAS ]);
+
+    game.move.select(Moves.SKILL_SWAP);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    expect(game.scene.getPlayerPokemon()?.getAbility().id).toBe(Abilities.BALL_FETCH);
+    expect(game.scene.getEnemyPokemon()?.getAbility().id).toBe(Abilities.ADAPTABILITY);
+  });
+
+  it("should activate post-summon abilities", async () => {
+    game.override.ability(Abilities.INTIMIDATE);
+    await game.classicMode.startBattle([ Species.FEEBAS ]);
+
+    game.move.select(Moves.SKILL_SWAP);
+    await game.phaseInterceptor.to("BerryPhase");
+
+    // player atk should be -1 after opponent gains intimidate and it activates
+    expect(game.scene.getPlayerPokemon()?.getStatStage(Stat.ATK)).toBe(-1);
+  });
+});