diff --git a/test/@types/vitest.d.ts b/test/@types/vitest.d.ts
index 21b8e6b09aa..d67a8b295fd 100644
--- a/test/@types/vitest.d.ts
+++ b/test/@types/vitest.d.ts
@@ -117,7 +117,10 @@ declare module "vitest" {
     toHaveHp(expectedHp: number): void;
 
     /**
-     * Check whether a {@linkcode Pokemon} has fainted (as determined by {@linkcode Pokemon.isFainted}).
+     * 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`.
      */
     toHaveFainted(): void;
 
@@ -127,7 +130,8 @@ declare module "vitest" {
      * @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}
+     * 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.
      */
     toHaveUsedPP(expectedMove: MoveId, ppUsed: number | "all"): void;
diff --git a/test/moves/grudge.test.ts b/test/moves/grudge.test.ts
index 7fa72a6747d..d9e2f4f8320 100644
--- a/test/moves/grudge.test.ts
+++ b/test/moves/grudge.test.ts
@@ -35,14 +35,15 @@ describe("Moves - Grudge", () => {
   it("should reduce the PP of an attack that faints the user to 0", async () => {
     await game.classicMode.startBattle([SpeciesId.FEEBAS]);
 
+    const feebas = game.field.getPlayerPokemon();
+    const ratatta = game.field.getEnemyPokemon();
+
     game.move.use(MoveId.GUILLOTINE);
     await game.move.forceEnemyMove(MoveId.GRUDGE);
     await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
-    await game.toEndOfTurn();
+    await game.phaseInterceptor.to("FaintPhase");
 
     // Ratatta should have fainted and consumed all of Guillotine's PP
-    const feebas = game.field.getPlayerPokemon();
-    const ratatta = game.field.getEnemyPokemon();
     expect(ratatta).toHaveFainted();
     expect(feebas).toHaveUsedPP(MoveId.GUILLOTINE, "all");
   });
@@ -50,6 +51,9 @@ describe("Moves - Grudge", () => {
   it("should remain in effect until the user's next move", async () => {
     await game.classicMode.startBattle([SpeciesId.FEEBAS]);
 
+    const feebas = game.field.getPlayerPokemon();
+    const ratatta = game.field.getEnemyPokemon();
+
     game.move.use(MoveId.SPLASH);
     await game.move.forceEnemyMove(MoveId.GRUDGE);
     await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
@@ -60,8 +64,6 @@ describe("Moves - Grudge", () => {
     await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
     await game.toEndOfTurn();
 
-    const feebas = game.field.getPlayerPokemon();
-    const ratatta = game.field.getEnemyPokemon();
     expect(ratatta).toHaveFainted();
     expect(feebas).toHaveUsedPP(MoveId.GUILLOTINE, "all");
   });
@@ -71,13 +73,14 @@ describe("Moves - Grudge", () => {
     game.override.weather(WeatherType.SANDSTORM);
     await game.classicMode.startBattle([SpeciesId.FEEBAS]);
 
+    const feebas = game.field.getPlayerPokemon();
+    const ratatta = game.field.getEnemyPokemon();
+
     game.move.use(MoveId.FALSE_SWIPE);
     await game.move.forceEnemyMove(MoveId.GRUDGE);
     await game.setTurnOrder([BattlerIndex.ENEMY, BattlerIndex.PLAYER]);
     await game.toEndOfTurn();
 
-    const feebas = game.field.getPlayerPokemon();
-    const ratatta = game.field.getEnemyPokemon();
     expect(ratatta).toHaveFainted();
     expect(feebas).toHaveUsedPP(MoveId.FALSE_SWIPE, 1);
   });
diff --git a/test/moves/spite.test.ts b/test/moves/spite.test.ts
index 1b75df98df7..56c1be76198 100644
--- a/test/moves/spite.test.ts
+++ b/test/moves/spite.test.ts
@@ -40,7 +40,7 @@ describe("Moves - Spite", () => {
     const karp = game.field.getEnemyPokemon();
     game.move.changeMoveset(karp, [MoveId.SPLASH, MoveId.TACKLE]);
 
-    game.move.use(MoveId.SPLASH);
+    game.move.use(MoveId.SPITE);
     await game.move.selectEnemyMove(MoveId.TACKLE);
     await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
     await game.toNextTurn();
@@ -48,7 +48,7 @@ describe("Moves - Spite", () => {
     expect(karp).toHaveUsedPP(MoveId.TACKLE, 1);
 
     game.move.use(MoveId.SPITE);
-    await game.move.forceEnemyMove(MoveId.SPLASH);
+    await game.move.selectEnemyMove(MoveId.SPLASH);
     await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
     await game.toEndOfTurn();
 
@@ -61,7 +61,7 @@ describe("Moves - Spite", () => {
     const karp = game.field.getEnemyPokemon();
     game.move.changeMoveset(karp, [MoveId.SPLASH, MoveId.TACKLE]);
 
-    game.move.use(MoveId.SPLASH);
+    game.move.use(MoveId.SPITE);
     await game.move.selectEnemyMove(MoveId.TACKLE);
     await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
     await game.toEndOfTurn();
@@ -77,7 +77,7 @@ describe("Moves - Spite", () => {
     game.move.changeMoveset(karp, [MoveId.TACKLE]);
     karp.moveset[0].ppUsed = 0;
 
-    game.move.use(MoveId.SPLASH);
+    game.move.use(MoveId.SPITE);
     await game.move.selectEnemyMove(MoveId.TACKLE);
     await game.setTurnOrder([BattlerIndex.PLAYER, BattlerIndex.ENEMY]);
     await game.toEndOfTurn();
diff --git a/test/test-utils/matchers/to-have-fainted.ts b/test/test-utils/matchers/to-have-fainted.ts
index 005bdd9c4b4..73ca96a31b5 100644
--- a/test/test-utils/matchers/to-have-fainted.ts
+++ b/test/test-utils/matchers/to-have-fainted.ts
@@ -29,5 +29,7 @@ export function toHaveFainted(this: MatcherState, received: unknown): SyncExpect
       pass
         ? `Expected ${pkmName} to NOT have fainted, but it did!`
         : `Expected ${pkmName} to have fainted, but it didn't! (${hp}/${maxHp} HP)`,
+    expected: 0,
+    actual: hp,
   };
 }
diff --git a/test/test-utils/matchers/to-have-full-hp.ts b/test/test-utils/matchers/to-have-full-hp.ts
index 57f40e3a5c9..3d7c8f9458d 100644
--- a/test/test-utils/matchers/to-have-full-hp.ts
+++ b/test/test-utils/matchers/to-have-full-hp.ts
@@ -29,5 +29,7 @@ export function toHaveFullHp(this: MatcherState, received: unknown): SyncExpecta
       pass
         ? `Expected ${pkmName} to NOT have full hp, but it did!`
         : `Expected ${pkmName} to have full hp, but it didn't! (${hp}/${maxHp} HP)`,
+    expected: maxHp,
+    actual: hp,
   };
 }
diff --git a/test/test-utils/matchers/to-have-used-pp.ts b/test/test-utils/matchers/to-have-used-pp.ts
index 661208e2609..05efebd439f 100644
--- a/test/test-utils/matchers/to-have-used-pp.ts
+++ b/test/test-utils/matchers/to-have-used-pp.ts
@@ -49,6 +49,7 @@ export function toHaveUsedPP(
       pass: false,
       message: () =>
         `Expected MoveId.${moveStr} to appear in ${pkmName}'s moveset exactly once, but got ${movesetMoves.length} times!`,
+      expected: expectedMove,
       actual: received.getMoveset(),
     };
   }