Implement Power & Guard Swap with Unit Tests

src/data/move.ts

@@ -2795,34 +2795,54 @@ export class ResetStatsAttr extends MoveEffectAttr {
 }
 
 /**
- * Attribute used for moves which swap the user and the target's stat stages.
+ * Attribute used for status moves, specifically Heart, Guard, and Power Swap,
+ * that swaps the user's and target's corresponding stat stages.
+ * @extends MoveEffectAttr
+ * @see {@linkcode apply}
  */
 export class SwapStatStagesAttr extends MoveEffectAttr {
+  /** The stat stages to be swapped between the user and the target */
+  private stats: readonly BattleStat[];
+
+  constructor(stats: readonly BattleStat[]) {
+    super();
+
+    this.stats = stats;
+  }
+
   /**
-   * Swaps the user and the target's stat changes.
-   * @param user Pokemon that used the move
-   * @param target The target of the move
-   * @param move Move with this attribute
+   * For all {@linkcode stats}, swaps the user's and target's corresponding stat
+   * stage.
+   * @param user the {@linkcode Pokemon} that used the move
+   * @param target the {@linkcode Pokemon} that the move was used on
+   * @param move N/A
    * @param args N/A
-   * @returns true if the function succeeds
+   * @returns true if attribute application succeeds
    */
   apply(user: Pokemon, target: Pokemon, move: Move, args: any []): boolean {
-    if (!super.apply(user, target, move, args)) {
-      return false;
-    } //Exits if the move can't apply
-
-    let temp: number;
+    if (super.apply(user, target, move, args)) {
       for (const s of BATTLE_STATS) {
-      temp = user.getStatStage(s);
+        const temp = user.getStatStage(s);
         user.setStatStage(s, target.getStatStage(s));
         target.setStatStage(s, temp);
       }
 
       target.updateInfo();
       user.updateInfo();
-    target.scene.queueMessage(i18next.t("moveTriggers:switchedStatChanges", {pokemonName: getPokemonNameWithAffix(user)}));
+
+      if (this.stats.length === 7) {
+        target.scene.queueMessage(i18next.t("moveTriggers:switchedStatChanges", { pokemonName: getPokemonNameWithAffix(user) }));
+      } else if (this.stats.length === 2) {
+        target.scene.queueMessage(i18next.t("moveTriggers:switchedTwoStatChanges", {
+          pokemonName: getPokemonNameWithAffix(user),
+          firstStat: i18next.t(getStatKey(this.stats[0])),
+          secondStat: i18next.t(getStatKey(this.stats[1]))
+        }));
+      }
       return true;
     }
+    return false;
+  }
 }
 
 export class HpSplitAttr extends MoveEffectAttr {
@@ -7345,9 +7365,9 @@ export function initMoves() {
       .attr(CopyMoveAttr)
       .ignoresVirtual(),
     new StatusMove(Moves.POWER_SWAP, Type.PSYCHIC, -1, 10, 100, 0, 4)
-      .unimplemented(),
+      .attr(SwapStatStagesAttr, [ Stat.ATK, Stat.SPATK ]),
     new StatusMove(Moves.GUARD_SWAP, Type.PSYCHIC, -1, 10, 100, 0, 4)
-      .unimplemented(),
+      .attr(SwapStatStagesAttr, [ Stat.DEF, Stat.SPDEF ]),
     new AttackMove(Moves.PUNISHMENT, Type.DARK, MoveCategory.PHYSICAL, -1, 100, 5, -1, 0, 4)
       .makesContact(true)
       .attr(PunishmentPowerAttr),
@@ -7361,7 +7381,7 @@ export function initMoves() {
       .attr(AddArenaTrapTagAttr, ArenaTagType.TOXIC_SPIKES)
       .target(MoveTarget.ENEMY_SIDE),
     new StatusMove(Moves.HEART_SWAP, Type.PSYCHIC, -1, 10, -1, 0, 4)
-      .attr(SwapStatStagesAttr),
+      .attr(SwapStatStagesAttr, BATTLE_STATS),
     new SelfStatusMove(Moves.AQUA_RING, Type.WATER, -1, 20, -1, 0, 4)
       .attr(AddBattlerTagAttr, BattlerTagType.AQUA_RING, true, true),
     new SelfStatusMove(Moves.MAGNET_RISE, Type.ELECTRIC, -1, 10, -1, 0, 4)

src/locales/en/move-trigger.ts

@@ -5,6 +5,7 @@ export const moveTriggers: SimpleTranslationEntries = {
   "cutHpPowerUpMove": "{{pokemonName}} cut its own HP to power up its move!",
   "absorbedElectricity": "{{pokemonName}} absorbed electricity!",
   "switchedStatChanges": "{{pokemonName}} switched stat changes with the target!",
+  "switchedTwoStatChanges": "{{pokemonName}} switched all changes to its {{firstStat}}\nand {{secondStat}} with its target!",
   "goingAllOutForAttack": "{{pokemonName}} is going all out for this attack!",
   "regainedHealth": "{{pokemonName}} regained\nhealth!",
   "keptGoingAndCrashed": "{{pokemonName}} kept going\nand crashed!",

src/test/moves/guard_swap.test.ts

@@ -0,0 +1,63 @@
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import Phaser from "phaser";
+import GameManager from "#app/test/utils/gameManager";
+import { Species } from "#enums/species";
+import { TurnEndPhase } from "#app/phases/turn-end-phase";
+import { Moves } from "#enums/moves";
+import { Stat } from "#enums/stat";
+import { getMovePosition } from "#app/test/utils/gameManagerUtils";
+import { Abilities } from "#enums/abilities";
+import { MoveEndPhase } from "#app/phases/move-end-phase.js";
+
+describe("Moves - Guard 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.battleType("single");
+    game.override.enemyAbility(Abilities.BALL_FETCH);
+    game.override.enemyMoveset(new Array(4).fill(Moves.SHELL_SMASH));
+    game.override.enemySpecies(Species.MEW);
+    game.override.enemyLevel(200);
+    game.override.moveset([ Moves.GUARD_SWAP ]);
+    game.override.ability(Abilities.NONE);
+  });
+
+  it("should swap the user's DEF AND SPDEF stat stages with the target's", async () => {
+    await game.startBattle([
+      Species.INDEEDEE
+    ]);
+
+    // Should start with no stat stages
+    const player = game.scene.getPlayerPokemon()!;
+    // After Shell Smash, should have +2 in ATK and SPATK, -1 in DEF and SPDEF
+    const enemy = game.scene.getEnemyPokemon()!;
+
+    game.doAttack(getMovePosition(game.scene, 0, Moves.GUARD_SWAP));
+
+    await game.phaseInterceptor.to(MoveEndPhase);
+
+    expect(player.getStatStage(Stat.DEF)).toBe(0);
+    expect(player.getStatStage(Stat.SPDEF)).toBe(0);
+    expect(enemy.getStatStage(Stat.DEF)).toBe(-1);
+    expect(enemy.getStatStage(Stat.SPDEF)).toBe(-1);
+
+    await game.phaseInterceptor.to(TurnEndPhase);
+
+    expect(player.getStatStage(Stat.DEF)).toBe(-1);
+    expect(player.getStatStage(Stat.SPDEF)).toBe(-1);
+    expect(enemy.getStatStage(Stat.DEF)).toBe(0);
+    expect(enemy.getStatStage(Stat.SPDEF)).toBe(0);
+  }, 20000);
+});

src/test/moves/power_swap.test.ts

@@ -0,0 +1,62 @@
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import Phaser from "phaser";
+import GameManager from "#app/test/utils/gameManager";
+import { Species } from "#enums/species";
+import { TurnEndPhase } from "#app/phases/turn-end-phase";
+import { Moves } from "#enums/moves";
+import { Stat } from "#enums/stat";
+import { getMovePosition } from "#app/test/utils/gameManagerUtils";
+import { Abilities } from "#enums/abilities";
+import { MoveEndPhase } from "#app/phases/move-end-phase.js";
+
+describe("Moves - Power 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.battleType("single");
+    game.override.enemyAbility(Abilities.BALL_FETCH);
+    game.override.enemyMoveset(new Array(4).fill(Moves.SHELL_SMASH));
+    game.override.enemySpecies(Species.MEW);
+    game.override.enemyLevel(200);
+    game.override.moveset([ Moves.POWER_SWAP ]);
+    game.override.ability(Abilities.NONE);
+  });
+
+  it("should swap the user's ATK AND SPATK stat stages with the target's", async () => {
+    await game.startBattle([
+      Species.INDEEDEE
+    ]);
+
+    // Should start with no stat stages
+    const player = game.scene.getPlayerPokemon()!;
+    // After Shell Smash, should have +2 in ATK and SPATK, -1 in DEF and SPDEF
+    const enemy = game.scene.getEnemyPokemon()!;
+    game.doAttack(getMovePosition(game.scene, 0, Moves.POWER_SWAP));
+
+    await game.phaseInterceptor.to(MoveEndPhase);
+
+    expect(player.getStatStage(Stat.ATK)).toBe(0);
+    expect(player.getStatStage(Stat.SPATK)).toBe(0);
+    expect(enemy.getStatStage(Stat.ATK)).toBe(2);
+    expect(enemy.getStatStage(Stat.SPATK)).toBe(2);
+
+    await game.phaseInterceptor.to(TurnEndPhase);
+
+    expect(player.getStatStage(Stat.ATK)).toBe(2);
+    expect(player.getStatStage(Stat.SPATK)).toBe(2);
+    expect(enemy.getStatStage(Stat.ATK)).toBe(0);
+    expect(enemy.getStatStage(Stat.SPATK)).toBe(0);
+  }, 20000);
+});

src/test/moves/speed_swap.test.ts

@@ -27,6 +27,7 @@ describe("Moves - Speed Swap", () => {
     game = new GameManager(phaserGame);
     game.override.battleType("single");
     game.override.enemyAbility(Abilities.NONE);
+    game.override.enemyMoveset(SPLASH_ONLY);
     game.override.enemySpecies(Species.MEW);
     game.override.enemyLevel(200);
     game.override.moveset([ Moves.SPEED_SWAP ]);
@@ -34,7 +35,6 @@ describe("Moves - Speed Swap", () => {
   });
 
   it("should swap the user's SPD and the target's SPD stats", async () => {
-    game.override.enemyMoveset(SPLASH_ONLY);
     await game.startBattle([
       Species.INDEEDEE
     ]);