[Test] Add Dragon Cheer tests (#4013)

* add dragon cheer tests

* Update src/test/moves/dragon_cheer.test.ts

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

* update tests

---------

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

src/test/moves/dragon_cheer.test.ts

@@ -0,0 +1,101 @@
+import { BattlerIndex } from "#app/battle";
+import { Type } from "#app/data/type";
+import { Moves } from "#app/enums/moves";
+import { Species } from "#app/enums/species";
+import { Abilities } from "#enums/abilities";
+import GameManager from "#test/utils/gameManager";
+import { SPLASH_ONLY } from "#test/utils/testUtils";
+import Phaser from "phaser";
+import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
+
+describe("Moves - Dragon Cheer", () => {
+  let phaserGame: Phaser.Game;
+  let game: GameManager;
+  const TIMEOUT = 20 * 1000;
+
+  beforeAll(() => {
+    phaserGame = new Phaser.Game({
+      type: Phaser.HEADLESS,
+    });
+  });
+
+  afterEach(() => {
+    game.phaseInterceptor.restoreOg();
+  });
+
+  beforeEach(() => {
+    game = new GameManager(phaserGame);
+    game.override
+      .battleType("double")
+      .enemyAbility(Abilities.BALL_FETCH)
+      .enemyMoveset(SPLASH_ONLY)
+      .enemyLevel(20)
+      .moveset([Moves.DRAGON_CHEER, Moves.TACKLE, Moves.SPLASH]);
+  });
+
+  it("increases the user's allies' critical hit ratio by one stage", async () => {
+    await game.classicMode.startBattle([Species.DRAGONAIR, Species.MAGIKARP]);
+
+    const enemy = game.scene.getEnemyField()[0];
+
+    vi.spyOn(enemy, "getCritStage");
+
+    game.move.select(Moves.DRAGON_CHEER, 0);
+    game.move.select(Moves.TACKLE, 1, BattlerIndex.ENEMY);
+
+    await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.PLAYER_2, BattlerIndex.ENEMY, BattlerIndex.ENEMY_2]);
+
+    // After Tackle
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expect(enemy.getCritStage).toHaveReturnedWith(1); // getCritStage is called on defender
+  }, TIMEOUT);
+
+  it("increases the user's Dragon-type allies' critical hit ratio by two stages", async () => {
+    await game.classicMode.startBattle([Species.MAGIKARP, Species.DRAGONAIR]);
+
+    const enemy = game.scene.getEnemyField()[0];
+
+    vi.spyOn(enemy, "getCritStage");
+
+    game.move.select(Moves.DRAGON_CHEER, 0);
+    game.move.select(Moves.TACKLE, 1, BattlerIndex.ENEMY);
+
+    await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.PLAYER_2, BattlerIndex.ENEMY, BattlerIndex.ENEMY_2]);
+
+    // After Tackle
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expect(enemy.getCritStage).toHaveReturnedWith(2); // getCritStage is called on defender
+  }, TIMEOUT);
+
+  it("applies the effect based on the allies' type upon use of the move, and do not change if the allies' type changes later in battle", async () => {
+    await game.classicMode.startBattle([Species.DRAGONAIR, Species.MAGIKARP]);
+
+    const magikarp = game.scene.getPlayerField()[1];
+    const enemy = game.scene.getEnemyField()[0];
+
+    vi.spyOn(enemy, "getCritStage");
+
+    game.move.select(Moves.DRAGON_CHEER, 0);
+    game.move.select(Moves.TACKLE, 1, BattlerIndex.ENEMY);
+
+    await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.PLAYER_2, BattlerIndex.ENEMY, BattlerIndex.ENEMY_2]);
+
+    // After Tackle
+    await game.phaseInterceptor.to("TurnEndPhase");
+    expect(enemy.getCritStage).toHaveReturnedWith(1); // getCritStage is called on defender
+
+    await game.toNextTurn();
+
+    // Change Magikarp's type to Dragon
+    vi.spyOn(magikarp, "getTypes").mockReturnValue([Type.DRAGON]);
+    expect(magikarp.getTypes()).toEqual([Type.DRAGON]);
+
+    game.move.select(Moves.SPLASH, 0);
+    game.move.select(Moves.TACKLE, 1, BattlerIndex.ENEMY);
+
+    await game.setTurnOrder([BattlerIndex.PLAYER_2, BattlerIndex.PLAYER, BattlerIndex.ENEMY, BattlerIndex.ENEMY_2]);
+
+    await game.phaseInterceptor.to("MoveEndPhase");
+    expect(enemy.getCritStage).toHaveReturnedWith(1); // getCritStage is called on defender
+  }, TIMEOUT);
+});