pokerogue/test/moves/belly_drum.test.ts

import { TurnEndPhase } from "#app/phases/turn-end-phase";
import { toDmgValue } from "#app/utils";
import { Moves } from "#enums/moves";
import { Species } from "#enums/species";
import { Stat } from "#enums/stat";
import GameManager from "#test/testUtils/gameManager";
import Phaser from "phaser";
import { afterEach, beforeAll, beforeEach, describe, expect, test } from "vitest";
import { Abilities } from "#app/enums/abilities";

// RATIO : HP Cost of Move
const RATIO = 2;
// PREDAMAGE : Amount of extra HP lost
const PREDAMAGE = 15;

describe("Moves - BELLY DRUM", () => {
  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
      .starterSpecies(Species.MAGIKARP)
      .enemySpecies(Species.SNORLAX)
      .startingLevel(100)
      .enemyLevel(100)
      .moveset([Moves.BELLY_DRUM])
      .enemyMoveset(Moves.SPLASH)
      .enemyAbility(Abilities.BALL_FETCH);
  });

  // Bulbapedia Reference: https://bulbapedia.bulbagarden.net/wiki/Belly_Drum_(move)

  test("raises the user's ATK stat stage to its max, at the cost of 1/2 of its maximum HP", async () => {
    await game.startBattle([Species.MAGIKARP]);

    const leadPokemon = game.scene.getPlayerPokemon()!;
    const hpLost = toDmgValue(leadPokemon.getMaxHp() / RATIO);

    game.move.select(Moves.BELLY_DRUM);
    await game.phaseInterceptor.to(TurnEndPhase);

    expect(leadPokemon.hp).toBe(leadPokemon.getMaxHp() - hpLost);
    expect(leadPokemon.getStatStage(Stat.ATK)).toBe(6);
  });

  test("will still take effect if an uninvolved stat stage is at max", async () => {
    await game.startBattle([Species.MAGIKARP]);

    const leadPokemon = game.scene.getPlayerPokemon()!;
    const hpLost = toDmgValue(leadPokemon.getMaxHp() / RATIO);

    // Here - Stat.ATK -> -3 and Stat.SPATK -> 6
    leadPokemon.setStatStage(Stat.ATK, -3);
    leadPokemon.setStatStage(Stat.SPATK, 6);

    game.move.select(Moves.BELLY_DRUM);
    await game.phaseInterceptor.to(TurnEndPhase);

    expect(leadPokemon.hp).toBe(leadPokemon.getMaxHp() - hpLost);
    expect(leadPokemon.getStatStage(Stat.ATK)).toBe(6);
    expect(leadPokemon.getStatStage(Stat.SPATK)).toBe(6);
  });

  test("fails if the pokemon's ATK stat stage is at its maximum", async () => {
    await game.startBattle([Species.MAGIKARP]);

    const leadPokemon = game.scene.getPlayerPokemon()!;

    leadPokemon.setStatStage(Stat.ATK, 6);

    game.move.select(Moves.BELLY_DRUM);
    await game.phaseInterceptor.to(TurnEndPhase);

    expect(leadPokemon.hp).toBe(leadPokemon.getMaxHp());
    expect(leadPokemon.getStatStage(Stat.ATK)).toBe(6);
  });

  test("fails if the user's health is less than 1/2", async () => {
    await game.startBattle([Species.MAGIKARP]);

    const leadPokemon = game.scene.getPlayerPokemon()!;
    const hpLost = toDmgValue(leadPokemon.getMaxHp() / RATIO);
    leadPokemon.hp = hpLost - PREDAMAGE;

    game.move.select(Moves.BELLY_DRUM);
    await game.phaseInterceptor.to(TurnEndPhase);

    expect(leadPokemon.hp).toBe(hpLost - PREDAMAGE);
    expect(leadPokemon.getStatStage(Stat.ATK)).toBe(0);
  });
});