Merge 6866248b41 into 375587213e

test/@types/test-helpers.ts

@@ -0,0 +1,27 @@
+import type { AtLeastOne, NonFunctionPropertiesRecursive as nonFunc } from "#types/type-helpers";
+
+/**
+ * Helper type to admit an object containing the given properties
+ * _and at least 1 other non-function property_.
+ * @example
+ * ```ts
+ * type foo = {
+ *   qux: 1 | 2 | 3,
+ *   bar: number,
+ *   baz: string
+ *   quux: () => void; // ignored!
+ * }
+ *
+ * type quxAndSomethingElse = OneOther<foo, "qux">
+ *
+ * const good1: quxAndSomethingElse = {qux: 1, bar: 3} // OK!
+ * const good2: quxAndSomethingElse = {qux: 2, baz: "4", bar: 12} // OK!
+ * const bad1: quxAndSomethingElse = {baz: "4", bar: 12} // Errors because `qux` is required
+ * const bad2: quxAndSomethingElse = {qux: 1} // Errors because at least 1 thing _other_ than `qux` is required
+ * ```
+ * @typeParam O - The object to source keys from
+ * @typeParam K - One or more of O's keys to render mandatory
+ */
+export type OneOther<O extends object, K extends keyof O> = AtLeastOne<Omit<nonFunc<O>, K>> & {
+  [key in K]: O[K];
+};

test/@types/vitest.d.ts

@@ -1,23 +1,32 @@
 import type { TerrainType } from "#app/data/terrain";
+import type { ArenaTag } from "#data/arena-tag";
 import type { AbilityId } from "#enums/ability-id";
+import type { ArenaTagType } from "#enums/arena-tag-type";
 import type { BattlerTagType } from "#enums/battler-tag-type";
 import type { MoveId } from "#enums/move-id";
 import type { PokemonType } from "#enums/pokemon-type";
 import type { BattleStat, EffectiveStat, Stat } from "#enums/stat";
 import type { StatusEffect } from "#enums/status-effect";
 import type { WeatherType } from "#enums/weather-type";
+import type { Arena } from "#field/arena";
 import type { Pokemon } from "#field/pokemon";
-import type { ToHaveEffectiveStatMatcherOptions } from "#test/test-utils/matchers/to-have-effective-stat";
+import type { toHaveEffectiveStatOptions } from "#test/test-utils/matchers/to-have-effective-stat";
 import type { expectedStatusType } from "#test/test-utils/matchers/to-have-status-effect";
 import type { toHaveTypesOptions } from "#test/test-utils/matchers/to-have-types";
 import type { TurnMove } from "#types/turn-move";
 import type { AtLeastOne } from "#types/type-helpers";
+import type { toDmgValue } from "utils/common";
 import type { expect } from "vitest";
+import type { PositionalTag } from "#data/positional-tags/positional-tag";
+import { PositionalTagType } from "#enums/positional-tag-type";
 import type Overrides from "#app/overrides";
+import type { ArenaTagSide } from "#enums/arena-tag-side";
 import type { PokemonMove } from "#moves/pokemon-move";
+import { toHaveArenaTagOptions } from "#test/test-utils/matchers/to-have-arena-tag";
+import { toHavePositionalTagOptions } from "#test/test-utils/matchers/to-have-positional-tag";
 
 declare module "vitest" {
-  interface Assertion {
+  interface Assertion<T> {
     /**
      * Check whether an array contains EXACTLY the given items (in any order).
      *
@@ -27,45 +36,9 @@ declare module "vitest" {
      * @param expected - The expected contents of the array, in any order
      * @see {@linkcode expect.arrayContaining}
      */
-    toEqualArrayUnsorted<E>(expected: E[]): void;
+    toEqualArrayUnsorted(expected: T[]): void;
 
-    /**
-     * Check whether a {@linkcode Pokemon}'s current typing includes the given types.
-     *
-     * @param expected - The expected types (in any order)
-     * @param options - The options passed to the matcher
-     */
-    toHaveTypes(expected: [PokemonType, ...PokemonType[]], options?: toHaveTypesOptions): void;
-
-    /**
-     * Matcher to check the contents of a {@linkcode Pokemon}'s move history.
-     *
-     * @param expectedValue - The expected value; can be a {@linkcode MoveId} or a partially filled {@linkcode TurnMove}
-     * containing the desired properties to check
-     * @param index - The index of the move history entry to check, in order from most recent to least recent.
-     * Default `0` (last used move)
-     * @see {@linkcode Pokemon.getLastXMoves}
-     */
-    toHaveUsedMove(expected: MoveId | AtLeastOne<TurnMove>, index?: number): void;
-
-    /**
-     * Check whether a {@linkcode Pokemon}'s effective stat is as expected
-     * (checked after all stat value modifications).
-     *
-     * @param stat - The {@linkcode EffectiveStat} to check
-     * @param expectedValue - The expected value of {@linkcode stat}
-     * @param options - (Optional) The {@linkcode ToHaveEffectiveStatMatcherOptions}
-     * @remarks
-     * If you want to check the stat **before** modifiers are applied, use {@linkcode Pokemon.getStat} instead.
-     */
-    toHaveEffectiveStat(stat: EffectiveStat, expectedValue: number, options?: ToHaveEffectiveStatMatcherOptions): void;
-
-    /**
-     * Check whether a {@linkcode Pokemon} has taken a specific amount of damage.
-     * @param expectedDamageTaken - The expected amount of damage taken
-     * @param roundDown - Whether to round down {@linkcode expectedDamageTaken} with {@linkcode toDmgValue}; default `true`
-     */
-    toHaveTakenDamage(expectedDamageTaken: number, roundDown?: boolean): void;
+    // #region Arena Matchers
 
     /**
      * Check whether the current {@linkcode WeatherType} is as expected.
@@ -80,9 +53,63 @@ declare module "vitest" {
     toHaveTerrain(expectedTerrainType: TerrainType): void;
 
     /**
-     * Check whether a {@linkcode Pokemon} is at full HP.
+     * Check whether the current {@linkcode Arena} contains the given {@linkcode ArenaTag}.
+     * @param expectedTag - A partially-filled {@linkcode ArenaTag} containing the desired properties
      */
-    toHaveFullHp(): void;
+    toHaveArenaTag<A extends ArenaTagType>(expectedTag: toHaveArenaTagOptions<A>): void;
+    /**
+     * Check whether the current {@linkcode Arena} contains the given {@linkcode ArenaTag}.
+     * @param expectedType - The {@linkcode ArenaTagType} of the desired tag
+     * @param side - The {@linkcode ArenaTagSide | side of the field} the tag should affect, or
+     * {@linkcode ArenaTagSide.BOTH} to check both sides;
+     * default `ArenaTagSide.BOTH`
+     */
+    toHaveArenaTag(expectedType: ArenaTagType, side?: ArenaTagSide): void;
+
+    /**
+     * Check whether the current {@linkcode Arena} contains the given {@linkcode PositionalTag}.
+     * @param expectedTag - A partially-filled {@linkcode PositionalTag} containing the desired properties
+     */
+    toHavePositionalTag<P extends PositionalTagType>(expectedTag: toHavePositionalTagOptions<P>): void;
+    /**
+     * Check whether the current {@linkcode Arena} contains the given number of {@linkcode PositionalTag}s.
+     * @param expectedType - The {@linkcode PositionalTagType} of the desired tag
+     * @param count - The number of instances of {@linkcode expectedType} that should be active;
+     * defaults to `1` and must be within the range `[0, 4]`
+     */
+    toHavePositionalTag(expectedType: PositionalTagType, count?: number): void;
+
+    // #endregion Arena Matchers
+
+    // #region Pokemon Matchers
+
+    /**
+     * Check whether a {@linkcode Pokemon}'s current typing includes the given types.
+     * @param expectedTags - The expected {@linkcode PokemonType}s to check against; must have length `>0`
+     * @param options - The {@linkcode toHaveTypesOptions | options} passed to the matcher
+     */
+    toHaveTypes(expectedTags: PokemonType[], options?: toHaveTypesOptions): void;
+
+    /**
+     * Check whether a {@linkcode Pokemon} has used a move matching the given criteria.
+     * @param expectedMove - The {@linkcode MoveId} the Pokemon is expected to have used,
+     * or a partially filled {@linkcode TurnMove} containing the desired properties to check
+     * @param index - The index of the move history entry to check, in order from most recent to least recent.
+     * Default `0` (last used move)
+     * @see {@linkcode Pokemon.getLastXMoves}
+     */
+    toHaveUsedMove(expectedMove: MoveId | AtLeastOne<TurnMove>, index?: number): void;
+
+    /**
+     * Check whether a {@linkcode Pokemon}'s effective stat is as expected
+     * (checked after all stat value modifications).
+     * @param stat - The {@linkcode EffectiveStat} to check
+     * @param expectedValue - The expected value of {@linkcode stat}
+     * @param options - The {@linkcode toHaveEffectiveStatOptions | options} passed to the matcher
+     * @remarks
+     * If you want to check the stat **before** modifiers are applied, use {@linkcode Pokemon.getStat} instead.
+     */
+    toHaveEffectiveStat(stat: EffectiveStat, expectedValue: number, options?: toHaveEffectiveStatOptions): void;
 
     /**
      * Check whether a {@linkcode Pokemon} has a specific {@linkcode StatusEffect | non-volatile status effect}.
@@ -106,7 +133,7 @@ declare module "vitest" {
 
     /**
      * Check whether a {@linkcode Pokemon} has applied a specific {@linkcode AbilityId}.
-     * @param expectedAbilityId - The expected {@linkcode AbilityId}
+     * @param expectedAbilityId - The expected {@linkcode AbilityId} to check for
      */
     toHaveAbilityApplied(expectedAbilityId: AbilityId): void;
 
@@ -116,24 +143,36 @@ declare module "vitest" {
      */
     toHaveHp(expectedHp: number): void;
 
+    /**
+     * Check whether a {@linkcode Pokemon} has taken a specific amount of damage.
+     * @param expectedDamageTaken - The expected amount of damage taken
+     * @param roundDown - Whether to round down {@linkcode expectedDamageTaken} with {@linkcode toDmgValue}; default `true`
+     */
+    toHaveTakenDamage(expectedDamageTaken: number, roundDown?: boolean): void;
+
     /**
      * Check whether a {@linkcode Pokemon} is currently fainted (as determined by {@linkcode Pokemon.isFainted}).
      * @remarks
-     * When checking whether an enemy wild Pokemon is fainted, one must reference it in a variable _before_ the fainting effect occurs
-     * as otherwise the Pokemon will be GC'ed and rendered `undefined`.
+     * When checking whether an enemy wild Pokemon is fainted, one must store a reference to it in a variable _before_ the fainting effect occurs,
+     * as otherwise the Pokemon will be removed from the field and garbage collected.
      */
     toHaveFainted(): void;
 
+    /**
+     * Check whether a {@linkcode Pokemon} is at full HP.
+     */
+    toHaveFullHp(): void;
     /**
      * Check whether a {@linkcode Pokemon} has consumed the given amount of PP for one of its moves.
-     * @param expectedValue - The {@linkcode MoveId} of the {@linkcode PokemonMove} that should have consumed PP
+     * @param moveId - The {@linkcode MoveId} of the {@linkcode PokemonMove} that should have consumed PP
      * @param ppUsed - The numerical amount of PP that should have been consumed,
      * or `all` to indicate the move should be _out_ of PP
      * @remarks
-     * If the Pokemon's moveset has been set via {@linkcode Overrides.MOVESET_OVERRIDE}/{@linkcode Overrides.OPP_MOVESET_OVERRIDE},
-     * does not contain {@linkcode expectedMove}
-     * or contains the desired move more than once, this will fail the test.
+     * If the Pokemon's moveset has been set via {@linkcode Overrides.MOVESET_OVERRIDE}/{@linkcode Overrides.OPP_MOVESET_OVERRIDE}
+     * or does not contain exactly 1 copy of {@linkcode moveId}, this will fail the test.
      */
-    toHaveUsedPP(expectedMove: MoveId, ppUsed: number | "all"): void;
+    toHaveUsedPP(moveId: MoveId, ppUsed: number | "all"): void;
+
+    // #region Pokemon Matchers
   }
 }

test/matchers.setup.ts

@@ -1,10 +1,12 @@
 import { toEqualArrayUnsorted } from "#test/test-utils/matchers/to-equal-array-unsorted";
 import { toHaveAbilityApplied } from "#test/test-utils/matchers/to-have-ability-applied";
+import { toHaveArenaTag } from "#test/test-utils/matchers/to-have-arena-tag";
 import { toHaveBattlerTag } from "#test/test-utils/matchers/to-have-battler-tag";
 import { toHaveEffectiveStat } from "#test/test-utils/matchers/to-have-effective-stat";
 import { toHaveFainted } from "#test/test-utils/matchers/to-have-fainted";
 import { toHaveFullHp } from "#test/test-utils/matchers/to-have-full-hp";
 import { toHaveHp } from "#test/test-utils/matchers/to-have-hp";
+import { toHavePositionalTag } from "#test/test-utils/matchers/to-have-positional-tag";
 import { toHaveStatStage } from "#test/test-utils/matchers/to-have-stat-stage";
 import { toHaveStatusEffect } from "#test/test-utils/matchers/to-have-status-effect";
 import { toHaveTakenDamage } from "#test/test-utils/matchers/to-have-taken-damage";
@@ -22,18 +24,20 @@ import { expect } from "vitest";
 
 expect.extend({
   toEqualArrayUnsorted,
+  toHaveWeather,
+  toHaveTerrain,
+  toHaveArenaTag,
+  toHavePositionalTag,
   toHaveTypes,
   toHaveUsedMove,
   toHaveEffectiveStat,
-  toHaveTakenDamage,
-  toHaveWeather,
-  toHaveTerrain,
-  toHaveFullHp,
   toHaveStatusEffect,
   toHaveStatStage,
   toHaveBattlerTag,
   toHaveAbilityApplied,
   toHaveHp,
+  toHaveTakenDamage,
+  toHaveFullHp,
   toHaveFainted,
   toHaveUsedPP,
 });

test/moves/wish.test.ts

@@ -39,15 +39,6 @@ describe("Move - Wish", () => {
       .enemyLevel(100);
   });
 
-  /**
-   * Expect that wish is active with the specified number of attacks.
-   * @param numAttacks - The number of wish instances that should be queued; default `1`
-   */
-  function expectWishActive(numAttacks = 1) {
-    const wishes = game.scene.arena.positionalTagManager["tags"].filter(t => t.tagType === PositionalTagType.WISH);
-    expect(wishes).toHaveLength(numAttacks);
-  }
-
   it("should heal the Pokemon in the current slot for 50% of the user's maximum HP", async () => {
     await game.classicMode.startBattle([SpeciesId.ALOMOMOLA, SpeciesId.BLISSEY]);
 
@@ -58,19 +49,19 @@ describe("Move - Wish", () => {
     game.move.use(MoveId.WISH);
     await game.toNextTurn();
 
-    expectWishActive();
+    expect(game).toHavePositionalTag(PositionalTagType.WISH);
 
     game.doSwitchPokemon(1);
     await game.toEndOfTurn();
 
-    expectWishActive(0);
+    expect(game).toHavePositionalTag(PositionalTagType.WISH, 0);
     expect(game.textInterceptor.logs).toContain(
       i18next.t("arenaTag:wishTagOnAdd", {
         pokemonNameWithAffix: getPokemonNameWithAffix(alomomola),
       }),
     );
-    expect(alomomola.hp).toBe(1);
-    expect(blissey.hp).toBe(toDmgValue(alomomola.getMaxHp() / 2) + 1);
+    expect(alomomola).toHaveHp(1);
+    expect(blissey).toHaveHp(toDmgValue(alomomola.getMaxHp() / 2) + 1);
   });
 
   it("should work if the user has full HP, but not if it already has an active Wish", async () => {
@@ -82,13 +73,13 @@ describe("Move - Wish", () => {
     game.move.use(MoveId.WISH);
     await game.toNextTurn();
 
-    expectWishActive();
+    expect(game).toHavePositionalTag(PositionalTagType.WISH);
 
     game.move.use(MoveId.WISH);
     await game.toEndOfTurn();
 
     expect(alomomola.hp).toBe(toDmgValue(alomomola.getMaxHp() / 2) + 1);
-    expect(alomomola.getLastXMoves()[0].result).toBe(MoveResult.FAIL);
+    expect(alomomola).toHaveUsedMove({ result: MoveResult.FAIL });
   });
 
   it("should function independently of Future Sight", async () => {
@@ -103,7 +94,8 @@ describe("Move - Wish", () => {
     await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
     await game.toNextTurn();
 
-    expectWishActive(1);
+    expect(game).toHavePositionalTag(PositionalTagType.WISH);
+    expect(game).toHavePositionalTag(PositionalTagType.DELAYED_ATTACK);
   });
 
   it("should work in double battles and trigger in order of creation", async () => {
@@ -127,7 +119,7 @@ describe("Move - Wish", () => {
     await game.setTurnOrder(oldOrder.map(p => p.getBattlerIndex()));
     await game.toNextTurn();
 
-    expectWishActive(4);
+    expect(game).toHavePositionalTag(PositionalTagType.WISH, 4);
 
     // Lower speed to change turn order
     alomomola.setStatStage(Stat.SPD, 6);
@@ -141,7 +133,7 @@ describe("Move - Wish", () => {
     await game.phaseInterceptor.to("PositionalTagPhase");
 
     // all wishes have activated and added healing phases
-    expectWishActive(0);
+    expect(game).toHavePositionalTag(PositionalTagType.WISH, 0);
 
     const healPhases = game.scene.phaseManager.phaseQueue.filter(p => p.is("PokemonHealPhase"));
     expect(healPhases).toHaveLength(4);
@@ -165,14 +157,14 @@ describe("Move - Wish", () => {
     game.move.use(MoveId.WISH, BattlerIndex.PLAYER_2);
     await game.toNextTurn();
 
-    expectWishActive();
+    expect(game).toHavePositionalTag(PositionalTagType.WISH);
 
     game.move.use(MoveId.SPLASH, BattlerIndex.PLAYER);
     game.move.use(MoveId.MEMENTO, BattlerIndex.PLAYER_2, BattlerIndex.ENEMY_2);
     await game.toEndOfTurn();
 
     // Wish went away without doing anything
-    expectWishActive(0);
+    expect(game).toHavePositionalTag(PositionalTagType.WISH, 0);
     expect(game.textInterceptor.logs).not.toContain(
       i18next.t("arenaTag:wishTagOnAdd", {
         pokemonNameWithAffix: getPokemonNameWithAffix(blissey),

test/test-utils/matchers/to-equal-array-unsorted.ts

@@ -1,4 +1,5 @@
 import { getOnelineDiffStr } from "#test/test-utils/string-utils";
+import { receivedStr } from "#test/test-utils/test-utils";
 import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 
 /**
@@ -14,22 +15,22 @@ export function toEqualArrayUnsorted(
 ): SyncExpectationResult {
   if (!Array.isArray(received)) {
     return {
-      pass: false,
-      message: () => `Expected an array, but got ${this.utils.stringify(received)}!`,
+      pass: this.isNot,
+      message: () => `Expected to receive an array, but got ${receivedStr(received)}!`,
     };
   }
 
   if (received.length !== expected.length) {
     return {
       pass: false,
-      message: () => `Expected to receive array of length ${received.length}, but got ${expected.length} instead!`,
-      actual: received,
+      message: () => `Expected to receive an array of length ${received.length}, but got ${expected.length} instead!`,
       expected,
+      actual: received,
     };
   }
 
-  const actualSorted = received.slice().sort();
-  const expectedSorted = expected.slice().sort();
+  const actualSorted = received.toSorted();
+  const expectedSorted = expected.toSorted();
   const pass = this.equals(actualSorted, expectedSorted, [...this.customTesters, this.utils.iterableEquality]);
 
   const actualStr = getOnelineDiffStr.call(this, actualSorted);

test/test-utils/matchers/to-have-ability-applied.ts

@@ -21,7 +21,7 @@ export function toHaveAbilityApplied(
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to recieve a Pokemon, but got ${receivedStr(received)}!`,
     };
   }

test/test-utils/matchers/to-have-arena-tag.ts

@@ -0,0 +1,79 @@
+import type { ArenaTag, ArenaTagTypeMap } from "#data/arena-tag";
+import type { ArenaTagSide } from "#enums/arena-tag-side";
+import type { ArenaTagType } from "#enums/arena-tag-type";
+import type { OneOther } from "#test/@types/test-helpers";
+// biome-ignore lint/correctness/noUnusedImports: TSDoc
+import type { GameManager } from "#test/test-utils/game-manager";
+import { getOnelineDiffStr } from "#test/test-utils/string-utils";
+import { isGameManagerInstance, receivedStr } from "#test/test-utils/test-utils";
+import type { NonFunctionPropertiesRecursive } from "#types/type-helpers";
+import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
+
+// intersection required to preserve T for inferences
+export type toHaveArenaTagOptions<T extends ArenaTagType> = OneOther<ArenaTagTypeMap[T], "tagType" | "side"> & {
+  tagType: T;
+};
+
+/**
+ * Matcher to check if the {@linkcode Arena} has a given {@linkcode ArenaTag} active.
+ * @param received - The object to check. Should be the current {@linkcode GameManager}.
+ * @param expectedTag - The {@linkcode ArenaTagType} of the desired tag, or a partially-filled object
+ * containing the desired properties
+ * @param side - The {@linkcode ArenaTagSide | side of the field} the tag should affect, or
+ * {@linkcode ArenaTagSide.BOTH} to check both sides
+ * @returns The result of the matching
+ */
+export function toHaveArenaTag<T extends ArenaTagType>(
+  this: MatcherState,
+  received: unknown,
+  // simplified types used for brevity; full overloads are in `vitest.d.ts`
+  expectedTag: T | (Partial<NonFunctionPropertiesRecursive<ArenaTag>> & { tagType: T; side: ArenaTagSide }),
+  side?: ArenaTagSide,
+): SyncExpectationResult {
+  if (!isGameManagerInstance(received)) {
+    return {
+      pass: this.isNot,
+      message: () => `Expected to recieve a GameManager, but got ${receivedStr(received)}!`,
+    };
+  }
+
+  if (!received.scene?.arena) {
+    return {
+      pass: this.isNot,
+      message: () => `Expected GameManager.${received.scene ? "scene.arena" : "scene"} to be defined!`,
+    };
+  }
+
+  if (typeof expectedTag === "string") {
+    // Coerce lone `tagType`s into objects
+    // Bangs are ok as we enforce safety via overloads
+    expectedTag = { tagType: expectedTag, side: side! };
+  }
+
+  // We need to get all tags for the case of checking properties of a tag present on both sides of the arena
+  const tags = received.scene.arena.findTagsOnSide(t => t.tagType === expectedTag.tagType, expectedTag.side);
+  if (tags.length === 0) {
+    return {
+      pass: false,
+      message: () => `Expected the Arena to have a tag of type ${expectedTag.tagType}, but it didn't!`,
+      expected: expectedTag.tagType,
+      actual: received.scene.arena.tags.map(t => t.tagType),
+    };
+  }
+
+  // Pass if any of the matching tags meet our criteria
+  const pass = tags.some(tag =>
+    this.equals(tag, expectedTag, [...this.customTesters, this.utils.subsetEquality, this.utils.iterableEquality]),
+  );
+
+  const expectedStr = getOnelineDiffStr.call(this, expectedTag);
+  return {
+    pass,
+    message: () =>
+      pass
+        ? `Expected the Arena to NOT have a tag matching ${expectedStr}, but it did!`
+        : `Expected the Arena to have a tag matching ${expectedStr}, but it didn't!`,
+    expected: expectedTag,
+    actual: tags,
+  };
+}

test/test-utils/matchers/to-have-effective-stat.ts

@@ -6,7 +6,7 @@ import { getStatName } from "#test/test-utils/string-utils";
 import { isPokemonInstance, receivedStr } from "#test/test-utils/test-utils";
 import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 
-export interface ToHaveEffectiveStatMatcherOptions {
+export interface toHaveEffectiveStatOptions {
   /**
    * The target {@linkcode Pokemon}
    * @see {@linkcode Pokemon.getEffectiveStat}
@@ -30,7 +30,7 @@ export interface ToHaveEffectiveStatMatcherOptions {
  * @param received - The object to check. Should be a {@linkcode Pokemon}
  * @param stat - The {@linkcode EffectiveStat} to check
  * @param expectedValue - The expected value of the {@linkcode stat}
- * @param options - The {@linkcode ToHaveEffectiveStatMatcherOptions}
+ * @param options - The {@linkcode toHaveEffectiveStatOptions}
  * @returns Whether the matcher passed
  */
 export function toHaveEffectiveStat(
@@ -38,11 +38,11 @@ export function toHaveEffectiveStat(
   received: unknown,
   stat: EffectiveStat,
   expectedValue: number,
-  { enemy, move, isCritical = false }: ToHaveEffectiveStatMatcherOptions = {},
+  { enemy, move, isCritical = false }: toHaveEffectiveStatOptions = {},
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }

test/test-utils/matchers/to-have-fainted.ts

@@ -12,7 +12,7 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 export function toHaveFainted(this: MatcherState, received: unknown): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }

test/test-utils/matchers/to-have-full-hp.ts

@@ -12,7 +12,7 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 export function toHaveFullHp(this: MatcherState, received: unknown): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }

test/test-utils/matchers/to-have-hp.ts

@@ -13,7 +13,7 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 export function toHaveHp(this: MatcherState, received: unknown, expectedHp: number): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }

test/test-utils/matchers/to-have-positional-tag.ts

@@ -0,0 +1,108 @@
+// biome-ignore-start lint/correctness/noUnusedImports: TSDoc
+import type { GameManager } from "#test/test-utils/game-manager";
+// biome-ignore-end lint/correctness/noUnusedImports: TSDoc
+
+import type { SerializedPositionalTag, serializedPosTagMap } from "#data/positional-tags/load-positional-tag";
+import type { PositionalTagType } from "#enums/positional-tag-type";
+import type { OneOther } from "#test/@types/test-helpers";
+import { getOnelineDiffStr } from "#test/test-utils/string-utils";
+import { isGameManagerInstance, receivedStr } from "#test/test-utils/test-utils";
+import { toTitleCase } from "#utils/strings";
+import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
+
+export type toHavePositionalTagOptions<P extends PositionalTagType> = OneOther<serializedPosTagMap[P], "tagType"> & {
+  tagType: P;
+};
+
+/**
+ * Matcher to check if the {@linkcode Arena} has a certain number of {@linkcode PositionalTag}s active.
+ * @param received - The object to check. Should be the current {@linkcode GameManager}
+ * @param expectedTag - The {@linkcode PositionalTagType} of the desired tag, or a partially-filled {@linkcode PositionalTag}
+ * containing the desired properties
+ * @param count - The number of tags that should be active; defaults to `1` and must be within the range `[0, 4]`
+ * @returns The result of the matching
+ */
+export function toHavePositionalTag<P extends PositionalTagType>(
+  this: MatcherState,
+  received: unknown,
+  // simplified types used for brevity; full overloads are in `vitest.d.ts`
+  expectedTag: P | (Partial<SerializedPositionalTag> & { tagType: P }),
+  count = 1,
+): SyncExpectationResult {
+  if (!isGameManagerInstance(received)) {
+    return {
+      pass: this.isNot,
+      message: () => `Expected to recieve a GameManager, but got ${receivedStr(received)}!`,
+    };
+  }
+
+  if (!received.scene?.arena?.positionalTagManager) {
+    return {
+      pass: this.isNot,
+      message: () =>
+        `Expected GameManager.${received.scene?.arena ? "scene.arena.positionalTagManager" : received.scene ? "scene.arena" : "scene"} to be defined!`,
+    };
+  }
+
+  // TODO: Increase limit if triple battles are added
+  if (count < 0 || count > 4) {
+    return {
+      pass: this.isNot,
+      message: () => `Expected count to be between 0 and 4, but got ${count} instead!`,
+    };
+  }
+
+  const allTags = received.scene.arena.positionalTagManager.tags;
+  const tagType = typeof expectedTag === "string" ? expectedTag : expectedTag.tagType;
+  const matchingTags = allTags.filter(t => t.tagType === tagType);
+
+  // If checking exclusively tag type, check solely the number of matching tags on field
+  if (typeof expectedTag === "string") {
+    const pass = matchingTags.length === count;
+    const expectedStr = getPosTagStr(expectedTag);
+
+    return {
+      pass,
+      message: () =>
+        pass
+          ? `Expected the Arena to NOT have ${count} ${expectedStr} active, but it did!`
+          : `Expected the Arena to have ${count} ${expectedStr} active, but got ${matchingTags.length} instead!`,
+      expected: expectedTag,
+      actual: allTags,
+    };
+  }
+
+  // Check for equality with the provided object
+  if (matchingTags.length === 0) {
+    return {
+      pass: false,
+      message: () => `Expected the Arena to have a tag of type ${expectedTag.tagType}, but it didn't!`,
+      expected: expectedTag.tagType,
+      actual: received.scene.arena.tags.map(t => t.tagType),
+    };
+  }
+
+  // Pass if any of the matching tags meet our criteria
+  const pass = matchingTags.some(tag =>
+    this.equals(tag, expectedTag, [...this.customTesters, this.utils.subsetEquality, this.utils.iterableEquality]),
+  );
+
+  const expectedStr = getOnelineDiffStr.call(this, expectedTag);
+  return {
+    pass,
+    message: () =>
+      pass
+        ? `Expected the Arena to NOT have a tag matching ${expectedStr}, but it did!`
+        : `Expected the Arena to have a tag matching ${expectedStr}, but it didn't!`,
+    expected: expectedTag,
+    actual: matchingTags,
+  };
+}
+
+function getPosTagStr(pType: PositionalTagType, count = 1): string {
+  let ret = toTitleCase(pType) + "Tag";
+  if (count > 1) {
+    ret += "s";
+  }
+  return ret;
+}

test/test-utils/matchers/to-have-stat-stage.ts

@@ -23,14 +23,14 @@ export function toHaveStatStage(
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }
 
   if (expectedStage < -6 || expectedStage > 6) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected ${expectedStage} to be within the range [-6, 6]!`,
     };
   }

test/test-utils/matchers/to-have-status-effect.ts

@@ -28,7 +28,7 @@ export function toHaveStatusEffect(
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }
@@ -37,10 +37,8 @@ export function toHaveStatusEffect(
   const actualEffect = received.status?.effect ?? StatusEffect.NONE;
 
   // Check exclusively effect equality first, coercing non-matching status effects to numbers.
-  if (actualEffect !== (expectedStatus as Exclude<typeof expectedStatus, StatusEffect>)?.effect) {
-    // This is actually 100% safe as `expectedStatus?.effect` will evaluate to `undefined` if a StatusEffect was passed,
-    // which will never match actualEffect by definition
-    expectedStatus = (expectedStatus as Exclude<typeof expectedStatus, StatusEffect>).effect;
+  if (typeof expectedStatus === "object" && actualEffect !== expectedStatus.effect) {
+    expectedStatus = expectedStatus.effect;
   }
 
   if (typeof expectedStatus === "number") {

test/test-utils/matchers/to-have-taken-damage.ts

@@ -24,7 +24,7 @@ export function toHaveTakenDamage(
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }

test/test-utils/matchers/to-have-terrain.ts

@@ -20,15 +20,15 @@ export function toHaveTerrain(
 ): SyncExpectationResult {
   if (!isGameManagerInstance(received)) {
     return {
-      pass: false,
-      message: () => `Expected GameManager, but got ${receivedStr(received)}!`,
+      pass: this.isNot,
+      message: () => `Expected to receive a GameManager, but got ${receivedStr(received)}!`,
     };
   }
 
   if (!received.scene?.arena) {
     return {
-      pass: false,
-      message: () => `Expected GameManager.${received.scene ? "scene" : "scene.arena"} to be defined!`,
+      pass: this.isNot,
+      message: () => `Expected GameManager.${received.scene ? "scene.arena" : "scene"} to be defined!`,
     };
   }
 
@@ -41,8 +41,8 @@ export function toHaveTerrain(
     pass,
     message: () =>
       pass
-        ? `Expected Arena to NOT have ${expectedStr} active, but it did!`
-        : `Expected Arena to have ${expectedStr} active, but got ${actualStr} instead!`,
+        ? `Expected the Arena to NOT have ${expectedStr} active, but it did!`
+        : `Expected the Arena to have ${expectedStr} active, but got ${actualStr} instead!`,
     expected: expectedTerrainType,
     actual,
   };

test/test-utils/matchers/to-have-types.ts

@@ -7,10 +7,16 @@ import { isPokemonInstance, receivedStr } from "../test-utils";
 
 export interface toHaveTypesOptions {
   /**
-   * Whether to enforce exact matches (`true`) or superset matches (`false`).
-   * @defaultValue `true`
+   * Value dictating the strength of the enforced typing match.
+   *
+   * Possible values (in ascending order of strength) are:
+   * - `"ordered"`: Enforce that the {@linkcode Pokemon}'s types are identical **and in the same order**
+   * - `"unordered"`: Enforce that the {@linkcode Pokemon}'s types are identical **without checking order**
+   * - `"superset"`: Enforce that the {@linkcode Pokemon}'s types are **a superset of** the expected types
+   * (all must be present, but extras can be there)
+   * @defaultValue `"unordered"`
    */
-  exact?: boolean;
+  mode?: "ordered" | "unordered" | "superset";
   /**
    * Optional arguments to pass to {@linkcode Pokemon.getTypes}.
    */
@@ -18,35 +24,46 @@ export interface toHaveTypesOptions {
 }
 
 /**
- * Matcher that checks if an array contains exactly the given items, disregarding order.
- * @param received - The object to check. Should be an array of one or more {@linkcode PokemonType}s.
- * @param options - The {@linkcode toHaveTypesOptions | options} for this matcher
+ * Matcher that checks if a {@linkcode Pokemon}'s typing is as expected.
+ * @param received - The object to check. Should be a {@linkcode Pokemon}
+ * @param expectedTypes - An array of one or more {@linkcode PokemonType}s to compare against.
+ * @param mode - The mode to perform the matching;
  * @returns The result of the matching
  */
 export function toHaveTypes(
   this: MatcherState,
   received: unknown,
-  expected: [PokemonType, ...PokemonType[]],
-  options: toHaveTypesOptions = {},
+  expectedTypes: [PokemonType, ...PokemonType[]],
+  { mode = "unordered", args = [] }: toHaveTypesOptions = {},
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to recieve a Pokémon, but got ${receivedStr(received)}!`,
     };
   }
 
-  const actualTypes = received.getTypes(...(options.args ?? [])).sort();
-  const expectedTypes = expected.slice().sort();
+  // Return early if no types were passed in
+  if (expectedTypes.length === 0) {
+    return {
+      pass: this.isNot,
+      message: () => "Expected to receive a non-empty array of PokemonTypes!",
+    };
+  }
+
+  // Avoid sorting the types if strict ordering is desired
+  const actualSorted = mode === "ordered" ? received.getTypes(...args) : received.getTypes(...args).toSorted();
+  const expectedSorted = mode === "ordered" ? expectedTypes : expectedTypes.toSorted();
 
   // Exact matches do not care about subset equality
-  const matchers = options.exact
-    ? [...this.customTesters, this.utils.iterableEquality]
-    : [...this.customTesters, this.utils.subsetEquality, this.utils.iterableEquality];
-  const pass = this.equals(actualTypes, expectedTypes, matchers);
+  const matchers =
+    mode === "superset"
+      ? [...this.customTesters, this.utils.iterableEquality]
+      : [...this.customTesters, this.utils.subsetEquality, this.utils.iterableEquality];
+  const pass = this.equals(actualSorted, expectedSorted, matchers);
 
-  const actualStr = stringifyEnumArray(PokemonType, actualTypes);
-  const expectedStr = stringifyEnumArray(PokemonType, expectedTypes);
+  const actualStr = stringifyEnumArray(PokemonType, actualSorted);
+  const expectedStr = stringifyEnumArray(PokemonType, expectedSorted);
   const pkmName = getPokemonNameWithAffix(received);
 
   return {
@@ -55,7 +72,7 @@ export function toHaveTypes(
       pass
         ? `Expected ${pkmName} to NOT have types ${expectedStr}, but it did!`
         : `Expected ${pkmName} to have types ${expectedStr}, but got ${actualStr} instead!`,
-    expected: expectedTypes,
-    actual: actualTypes,
+    expected: expectedSorted,
+    actual: actualSorted,
   };
 }

test/test-utils/matchers/to-have-used-move.ts

@@ -13,7 +13,7 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 /**
  * Matcher to check the contents of a {@linkcode Pokemon}'s move history.
  * @param received - The actual value received. Should be a {@linkcode Pokemon}
- * @param expectedValue - The {@linkcode MoveId} the Pokemon is expected to have used,
+ * @param expectedMove - The {@linkcode MoveId} the Pokemon is expected to have used,
  * or a partially filled {@linkcode TurnMove} containing the desired properties to check
  * @param index - The index of the move history entry to check, in order from most recent to least recent.
  * Default `0` (last used move)
@@ -22,12 +22,12 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 export function toHaveUsedMove(
   this: MatcherState,
   received: unknown,
-  expectedResult: MoveId | AtLeastOne<TurnMove>,
+  expectedMove: MoveId | AtLeastOne<TurnMove>,
   index = 0,
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }
@@ -37,34 +37,33 @@ export function toHaveUsedMove(
 
   if (move === undefined) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected ${pkmName} to have used ${index + 1} moves, but it didn't!`,
       actual: received.getLastXMoves(-1),
     };
   }
 
   // Coerce to a `TurnMove`
-  if (typeof expectedResult === "number") {
-    expectedResult = { move: expectedResult };
+  if (typeof expectedMove === "number") {
+    expectedMove = { move: expectedMove };
   }
 
   const moveIndexStr = index === 0 ? "last move" : `${getOrdinal(index)} most recent move`;
 
-  const pass = this.equals(move, expectedResult, [
+  const pass = this.equals(move, expectedMove, [
     ...this.customTesters,
     this.utils.subsetEquality,
     this.utils.iterableEquality,
   ]);
 
-  const expectedStr = getOnelineDiffStr.call(this, expectedResult);
+  const expectedStr = getOnelineDiffStr.call(this, expectedMove);
   return {
     pass,
     message: () =>
       pass
         ? `Expected ${pkmName}'s ${moveIndexStr} to NOT match ${expectedStr}, but it did!`
-        : // Replace newlines with spaces to preserve one-line ness
-          `Expected ${pkmName}'s ${moveIndexStr} to match ${expectedStr}, but it didn't!`,
-    expected: expectedResult,
+        : `Expected ${pkmName}'s ${moveIndexStr} to match ${expectedStr}, but it didn't!`,
+    expected: expectedMove,
     actual: move,
   };
 }

test/test-utils/matchers/to-have-used-pp.ts

@@ -13,7 +13,7 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 /**
  * Matcher to check the amount of PP consumed by a {@linkcode Pokemon}.
  * @param received - The actual value received. Should be a {@linkcode Pokemon}
- * @param expectedValue - The {@linkcode MoveId} that should have consumed PP
+ * @param moveId - The {@linkcode MoveId} that should have consumed PP
  * @param ppUsed - The numerical amount of PP that should have been consumed,
  * or `all` to indicate the move should be _out_ of PP
  * @returns Whether the matcher passed
@@ -23,12 +23,12 @@ import type { MatcherState, SyncExpectationResult } from "@vitest/expect";
 export function toHaveUsedPP(
   this: MatcherState,
   received: unknown,
-  expectedMove: MoveId,
+  moveId: MoveId,
   ppUsed: number | "all",
 ): SyncExpectationResult {
   if (!isPokemonInstance(received)) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () => `Expected to receive a Pokémon, but got ${receivedStr(received)}!`,
     };
   }
@@ -36,22 +36,22 @@ export function toHaveUsedPP(
   const override = received.isPlayer() ? Overrides.MOVESET_OVERRIDE : Overrides.OPP_MOVESET_OVERRIDE;
   if (coerceArray(override).length > 0) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () =>
         `Cannot test for PP consumption with ${received.isPlayer() ? "player" : "enemy"} moveset overrides active!`,
     };
   }
 
   const pkmName = getPokemonNameWithAffix(received);
-  const moveStr = getEnumStr(MoveId, expectedMove);
+  const moveStr = getEnumStr(MoveId, moveId);
 
-  const movesetMoves = received.getMoveset().filter(pm => pm.moveId === expectedMove);
+  const movesetMoves = received.getMoveset().filter(pm => pm.moveId === moveId);
   if (movesetMoves.length !== 1) {
     return {
-      pass: false,
+      pass: this.isNot,
       message: () =>
         `Expected MoveId.${moveStr} to appear in ${pkmName}'s moveset exactly once, but got ${movesetMoves.length} times!`,
-      expected: expectedMove,
+      expected: moveId,
       actual: received.getMoveset(),
     };
   }

test/test-utils/matchers/to-have-weather.ts

@@ -20,15 +20,15 @@ export function toHaveWeather(
 ): SyncExpectationResult {
   if (!isGameManagerInstance(received)) {
     return {
-      pass: false,
-      message: () => `Expected GameManager, but got ${receivedStr(received)}!`,
+      pass: this.isNot,
+      message: () => `Expected to receive a GameManager, but got ${receivedStr(received)}!`,
     };
   }
 
   if (!received.scene?.arena) {
     return {
-      pass: false,
-      message: () => `Expected GameManager.${received.scene ? "scene" : "scene.arena"} to be defined!`,
+      pass: this.isNot,
+      message: () => `Expected GameManager.${received.scene ? "scene.arena" : "scene"} to be defined!`,
     };
   }
 
@@ -41,8 +41,8 @@ export function toHaveWeather(
     pass,
     message: () =>
       pass
-        ? `Expected Arena to NOT have ${expectedStr} weather active, but it did!`
-        : `Expected Arena to have ${expectedStr} weather active, but got ${actualStr} instead!`,
+        ? `Expected the Arena to NOT have ${expectedStr} weather active, but it did!`
+        : `Expected the Arena to have ${expectedStr} weather active, but got ${actualStr} instead!`,
     expected: expectedWeatherType,
     actual,
   };

test/test-utils/string-utils.ts

@@ -34,10 +34,10 @@ interface getEnumStrOptions {
  * @returns The stringified representation of `val` as dictated by the options.
  * @example
  * ```ts
- * enum fakeEnum {
- *   ONE: 1,
- *   TWO: 2,
- *   THREE: 3,
+ * enum testEnum {
+ *   ONE = 1,
+ *   TWO = 2,
+ *   THREE = 3,
  * }
  * getEnumStr(fakeEnum, fakeEnum.ONE); // Output: "ONE (=1)"
  * getEnumStr(fakeEnum, fakeEnum.TWO, {casing: "Title", prefix: "fakeEnum.", suffix: "!!!"}); // Output: "fakeEnum.TWO!!! (=2)"
@@ -174,10 +174,14 @@ export function getStatName(s: Stat): string {
  * Convert an object into a oneline diff to be shown in an error message.
  * @param obj - The object to return the oneline diff of
  * @returns The updated diff
+ * @example
+ * ```ts
+ * const diff = getOnelineDiffStr.call(this, obj)
+ * ```
  */
 export function getOnelineDiffStr(this: MatcherState, obj: unknown): string {
   return this.utils
     .stringify(obj, undefined, { maxLength: 35, indent: 0, printBasicPrototype: false })
     .replace(/\n/g, " ") // Replace newlines with spaces
-    .replace(/,(\s*)}$/g, "$1}");
+    .replace(/,(\s*)}$/g, "$1}"); // Trim trailing commas
 }