Add test for Dancer (unfinished)

src/test/abilities/dancer.test.ts

@@ -0,0 +1,61 @@
+import { BattlerIndex } from "#app/battle.js";
+import { BattleStat } from "#app/data/battle-stat";
+import { Abilities } from "#enums/abilities";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import GameManager from "#test/utils/gameManager";
+import { getMovePosition } from "#test/utils/gameManagerUtils";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+describe("Abilities - Dancer", () => {
+  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
+      .battleType("single")
+      .starterSpecies(Species.FEEBAS)
+      .moveset([Moves.FIERY_DANCE, Moves.QUIVER_DANCE, Moves.SWORDS_DANCE, Moves.FEATHER_DANCE])
+      .ability(Abilities.DANCER)
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.DANCER)
+      .enemyMoveset(Array(4).fill(Moves.VICTORY_DANCE));
+  });
+
+  // Reference Link: https://bulbapedia.bulbagarden.net/wiki/Dancer_(Ability)
+
+  it("only prevents ATK drops", async () => {
+    await game.startBattle();
+
+    const enemy = game.scene.getEnemyPokemon()!;
+
+    game.doAttack(getMovePosition(game.scene, 0, Moves.FIERY_DANCE));
+    game.doSelectTarget(BattlerIndex.ENEMY);
+    game.doAttack(getMovePosition(game.scene, 1, Moves.SWORDS_DANCE));
+    await game.toNextTurn();
+    game.doAttack(getMovePosition(game.scene, 0, Moves.DEFOG));
+    await game.toNextTurn();
+    game.doAttack(getMovePosition(game.scene, 0, Moves.NOBLE_ROAR));
+    await game.toNextTurn();
+    game.doAttack(getMovePosition(game.scene, 0, Moves.SAND_ATTACK));
+    await game.toNextTurn();
+    game.override.moveset([Moves.STRING_SHOT]);
+    game.doAttack(getMovePosition(game.scene, 0, Moves.STRING_SHOT));
+    await game.toNextTurn();
+
+    expect(enemy.summonData.battleStats[BattleStat.ATK]).toEqual(0);
+    [BattleStat.ACC, BattleStat.DEF, BattleStat.EVA, BattleStat.SPATK, BattleStat.SPDEF, BattleStat.SPD].forEach((stat: number) => expect(enemy.summonData.battleStats[stat]).toBeLessThan(0));
+  });
+});