[Bug][Ability] Fix mold breaker effect lingering if the user's move runs out of PP (#5265)

* Fix mold breaker pp bug

* Update Dancer test to account for changed phase behavior

* Update doc comment for move-phase's `end` method

* Add null handling for pokemon in `move-end` phase

---------

Co-authored-by: NightKev <34855794+DayKev@users.noreply.github.com>

src/phases/move-end-phase.ts

@@ -1,13 +1,20 @@
 import { globalScene } from "#app/global-scene";
 import { BattlerTagLapseType } from "#app/data/battler-tags";
 import { PokemonPhase } from "./pokemon-phase";
+import type { BattlerIndex } from "#app/battle";
 
 export class MoveEndPhase extends PokemonPhase {
+  private wasFollowUp: boolean;
+  constructor(battlerIndex: BattlerIndex, wasFollowUp: boolean = false) {
+    super(battlerIndex);
+    this.wasFollowUp = wasFollowUp;
+  }
+
   start() {
     super.start();
 
     const pokemon = this.getPokemon();
-    if (pokemon.isActive(true)) {
+    if (!this.wasFollowUp && pokemon?.isActive(true)) {
       pokemon.lapseTags(BattlerTagLapseType.AFTER_MOVE);
     }
 

src/phases/move-phase.ts

@@ -465,13 +465,10 @@ export class MovePhase extends BattlePhase {
   }
 
   /**
-   * Queues a {@linkcode MoveEndPhase} if the move wasn't a {@linkcode followUp} and {@linkcode canMove()} returns `true`,
-   * then ends the phase.
+   * Queues a {@linkcode MoveEndPhase} and then ends the phase
    */
   public end(): void {
-    if (!this.followUp && this.canMove()) {
-      globalScene.unshiftPhase(new MoveEndPhase(this.pokemon.getBattlerIndex()));
-    }
+    globalScene.unshiftPhase(new MoveEndPhase(this.pokemon.getBattlerIndex(), this.followUp));
 
     super.end();
   }

test/abilities/dancer.test.ts

@@ -39,20 +39,24 @@ describe("Abilities - Dancer", () => {
     game.move.select(Moves.SPLASH);
     game.move.select(Moves.SWORDS_DANCE, 1);
     await game.setTurnOrder([BattlerIndex.PLAYER_2, BattlerIndex.ENEMY, BattlerIndex.PLAYER, BattlerIndex.ENEMY_2]);
-    await game.phaseInterceptor.to("MovePhase");
-    // immediately copies ally move
-    await game.phaseInterceptor.to("MovePhase", false);
+    await game.phaseInterceptor.to("MovePhase"); // feebas uses swords dance
+    await game.phaseInterceptor.to("MovePhase", false); // oricorio copies swords dance
+
     let currentPhase = game.scene.getCurrentPhase() as MovePhase;
     expect(currentPhase.pokemon).toBe(oricorio);
     expect(currentPhase.move.moveId).toBe(Moves.SWORDS_DANCE);
-    await game.phaseInterceptor.to("MoveEndPhase");
-    await game.phaseInterceptor.to("MovePhase");
-    // immediately copies enemy move
-    await game.phaseInterceptor.to("MovePhase", false);
+
+    await game.phaseInterceptor.to("MoveEndPhase"); // end oricorio's move
+    await game.phaseInterceptor.to("MovePhase"); // magikarp 1 copies swords dance
+    await game.phaseInterceptor.to("MovePhase"); // magikarp 2 copies swords dance
+    await game.phaseInterceptor.to("MovePhase"); // magikarp (left) uses victory dance
+    await game.phaseInterceptor.to("MovePhase", false); // oricorio copies magikarp's victory dance
+
     currentPhase = game.scene.getCurrentPhase() as MovePhase;
     expect(currentPhase.pokemon).toBe(oricorio);
     expect(currentPhase.move.moveId).toBe(Moves.VICTORY_DANCE);
-    await game.phaseInterceptor.to("BerryPhase");
+
+    await game.phaseInterceptor.to("BerryPhase"); // finish the turn
 
     // doesn't use PP if copied move is also in moveset
     expect(oricorio.moveset[0]?.ppUsed).toBe(0);

test/abilities/mold_breaker.test.ts

@@ -0,0 +1,51 @@
+import { BattlerIndex } from "#app/battle";
+import { globalScene } from "#app/global-scene";
+import { Abilities } from "#enums/abilities";
+import { Moves } from "#enums/moves";
+import { Species } from "#enums/species";
+import GameManager from "#test/testUtils/gameManager";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+
+describe("Abilities - Mold Breaker", () => {
+  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.MOLD_BREAKER)
+      .battleType("single")
+      .disableCrits()
+      .enemySpecies(Species.MAGIKARP)
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(Moves.SPLASH);
+  });
+
+  it("should turn off the ignore abilities arena variable after the user's move", async () => {
+    game.override.enemyMoveset(Moves.SPLASH)
+      .ability(Abilities.MOLD_BREAKER)
+      .moveset([ Moves.ERUPTION ])
+      .startingLevel(100)
+      .enemyLevel(2);
+    await game.classicMode.startBattle([ Species.MAGIKARP ]);
+    const enemy = game.scene.getEnemyPokemon()!;
+
+    expect(enemy.isFainted()).toBe(false);
+    game.move.select(Moves.SPLASH);
+    await game.setTurnOrder([ BattlerIndex.PLAYER, BattlerIndex.ENEMY ]);
+    await game.phaseInterceptor.to("MoveEndPhase", true);
+    expect(globalScene.arena.ignoreAbilities).toBe(false);
+  });
+});