[Bug] Fix Pokemon not gaining HP when evolving (#3569)

* Don't recalculate stats that already exist

* add test to cover hp update after evo (#4)

- add evolution phase to phase interceptor
- add mock for video game object
- add returning video mock on add.video()

* add test to make sure pkm are not healed on evolve

* Stop on `EndEvolutionPhase` to prevent game state leak in tests

* Fix imports

* Remove `.js` from import

Co-authored-by: flx-sta <50131232+flx-sta@users.noreply.github.com>

* Add docs to mock class

---------

Co-authored-by: flx-sta <50131232+flx-sta@users.noreply.github.com>

src/field/pokemon.ts

@@ -251,7 +251,9 @@ export default abstract class Pokemon extends Phaser.GameObjects.Container {
       this.shiny = false;
     }
 
-    this.calculateStats();
+    if (!dataSource) {
+      this.calculateStats();
+    }
   }
 
 

src/test/evolution.test.ts

@@ -1,9 +1,11 @@
 import { pokemonEvolutions, SpeciesFormEvolution, SpeciesWildEvolutionDelay } from "#app/data/pokemon-evolutions";
 import { Abilities } from "#app/enums/abilities";
+import { Moves } from "#app/enums/moves";
 import { Species } from "#app/enums/species";
 import GameManager from "#test/utils/gameManager";
 import Phaser from "phaser";
 import { afterEach, beforeAll, beforeEach, describe, expect, it } from "vitest";
+import { SPLASH_ONLY } from "./utils/testUtils";
 
 describe("Evolution", () => {
   let phaserGame: Phaser.Game;
@@ -89,4 +91,61 @@ describe("Evolution", () => {
 
     expect(speciesFormEvo.wildDelay).toBe(SpeciesWildEvolutionDelay.NONE);
   });
+
+  it("should increase both HP and max HP when evolving", async () => {
+    game.override.moveset([Moves.SURF])
+      .enemySpecies(Species.GOLEM)
+      .enemyMoveset(SPLASH_ONLY)
+      .startingWave(21)
+      .startingLevel(16)
+      .enemyLevel(50);
+
+    await game.startBattle([Species.TOTODILE]);
+
+    const totodile = game.scene.getPlayerPokemon()!;
+    const hpBefore = totodile.hp;
+
+    expect(totodile.hp).toBe(totodile.getMaxHp());
+
+    const golem = game.scene.getEnemyPokemon()!;
+    golem.hp = 1;
+
+    expect(golem.hp).toBe(1);
+
+    game.move.select(Moves.SURF);
+    await game.phaseInterceptor.to("EndEvolutionPhase");
+
+    expect(totodile.hp).toBe(totodile.getMaxHp());
+    expect(totodile.hp).toBeGreaterThan(hpBefore);
+  }, TIMEOUT);
+
+  it("should not fully heal HP when evolving", async () => {
+    game.override.moveset([Moves.SURF])
+      .enemySpecies(Species.GOLEM)
+      .enemyMoveset(SPLASH_ONLY)
+      .startingWave(21)
+      .startingLevel(13)
+      .enemyLevel(30);
+
+    await game.startBattle([Species.CYNDAQUIL]);
+
+    const cyndaquil = game.scene.getPlayerPokemon()!;
+    cyndaquil.hp = Math.floor(cyndaquil.getMaxHp() / 2);
+    const hpBefore = cyndaquil.hp;
+    const maxHpBefore = cyndaquil.getMaxHp();
+
+    expect(cyndaquil.hp).toBe(Math.floor(cyndaquil.getMaxHp() / 2));
+
+    const golem = game.scene.getEnemyPokemon()!;
+    golem.hp = 1;
+
+    expect(golem.hp).toBe(1);
+
+    game.move.select(Moves.SURF);
+    await game.phaseInterceptor.to("EndEvolutionPhase");
+
+    expect(cyndaquil.getMaxHp()).toBeGreaterThan(maxHpBefore);
+    expect(cyndaquil.hp).toBeGreaterThan(hpBefore);
+    expect(cyndaquil.hp).toBeLessThan(cyndaquil.getMaxHp());
+  }, TIMEOUT);
 });

src/test/utils/mocks/mockTextureManager.ts

@@ -7,6 +7,8 @@ import MockSprite from "#test/utils/mocks/mocksContainer/mockSprite";
 import MockText from "#test/utils/mocks/mocksContainer/mockText";
 import MockTexture from "#test/utils/mocks/mocksContainer/mockTexture";
 import { MockGameObject } from "./mockGameObject";
+import { vi } from "vitest";
+import { MockVideoGameObject } from "./mockVideoGameObject";
 
 /**
  * Stub class for Phaser.Textures.TextureManager
@@ -34,6 +36,7 @@ export default class MockTextureManager {
       text: this.text.bind(this),
       bitmapText: this.text.bind(this),
       displayList: this.displayList,
+      video: vi.fn(() => new MockVideoGameObject()),
     };
   }
 

src/test/utils/mocks/mockVideoGameObject.ts

@@ -0,0 +1,13 @@
+import { vi } from "vitest";
+import { MockGameObject } from "./mockGameObject";
+
+/** Mocks video-related stuff */
+export class MockVideoGameObject implements MockGameObject {
+  constructor() {}
+
+  public play = vi.fn();
+  public stop = vi.fn(() => this);
+  public setOrigin = vi.fn();
+  public setScale = vi.fn();
+  public setVisible = vi.fn();
+}

src/test/utils/phaseInterceptor.ts

@@ -6,7 +6,9 @@ import { CommandPhase } from "#app/phases/command-phase";
 import { DamagePhase } from "#app/phases/damage-phase";
 import { EggLapsePhase } from "#app/phases/egg-lapse-phase";
 import { EncounterPhase } from "#app/phases/encounter-phase";
+import { EndEvolutionPhase } from "#app/phases/end-evolution-phase";
 import { EnemyCommandPhase } from "#app/phases/enemy-command-phase";
+import { EvolutionPhase } from "#app/phases/evolution-phase";
 import { FaintPhase } from "#app/phases/faint-phase";
 import { LoginPhase } from "#app/phases/login-phase";
 import { MessagePhase } from "#app/phases/message-phase";
@@ -92,6 +94,8 @@ export default class PhaseInterceptor {
     [SwitchPhase, this.startPhase],
     [SwitchSummonPhase, this.startPhase],
     [PartyHealPhase, this.startPhase],
+    [EvolutionPhase, this.startPhase],
+    [EndEvolutionPhase, this.startPhase],
   ];
 
   private endBySetMode = [