diff --git a/src/test/utils/gameManager.ts b/src/test/utils/gameManager.ts
index 4550891dcf9..6c750c60a92 100644
--- a/src/test/utils/gameManager.ts
+++ b/src/test/utils/gameManager.ts
@@ -35,6 +35,7 @@ import { BattlerIndex } from "#app/battle.js";
 import TargetSelectUiHandler from "#app/ui/target-select-ui-handler.js";
 import BattleMessageUiHandler from "#app/ui/battle-message-ui-handler";
 import {MysteryEncounterPhase} from "#app/phases/mystery-encounter-phase";
+import { OverridesHelper } from "./overridesHelper";
 
 /**
  * Class to manage the game state and transitions between phases.
@@ -45,6 +46,7 @@ export default class GameManager {
   public phaseInterceptor: PhaseInterceptor;
   public textInterceptor: TextInterceptor;
   public inputsHandler: InputsHandler;
+  public readonly override: OverridesHelper;
 
   /**
    * Creates an instance of GameManager.
@@ -60,6 +62,7 @@ export default class GameManager {
     this.phaseInterceptor = new PhaseInterceptor(this.scene);
     this.textInterceptor = new TextInterceptor(this.scene);
     this.gameWrapper.setScene(this.scene);
+    this.override = new OverridesHelper();
   }
 
   /**
diff --git a/src/test/utils/overridesHelper.ts b/src/test/utils/overridesHelper.ts
new file mode 100644
index 00000000000..5500533470e
--- /dev/null
+++ b/src/test/utils/overridesHelper.ts
@@ -0,0 +1,45 @@
+import { Biome } from "#app/enums/biome";
+import * as Overrides from "#app/overrides";
+import { vi } from "vitest";
+
+/**
+ * Helper to handle overrides in tests
+ */
+export class OverridesHelper {
+  constructor() {}
+
+  /**
+   * Set the encounter chance for a mystery encounter.
+   * @param percentage the encounter chance in %
+   */
+  mysteryEncounterChance(percentage: number) {
+    const maxRate: number = 256; // 100%
+    const rate = maxRate * (percentage / 100);
+    vi.spyOn(Overrides, "MYSTERY_ENCOUNTER_RATE_OVERRIDE", "get").mockReturnValue(rate);
+    this.log(`Mystery encounter chance set to ${percentage}% (=${rate})!`);
+  }
+
+  /**
+   * Set the starting biome
+   * @warning The biome will not be overridden unless you call `workaround_reInitSceneWithOverrides()` (testUtils)
+   * @param biome the biome to set
+   */
+  startingBiome(biome: Biome) {
+    vi.spyOn(Overrides, "STARTING_BIOME_OVERRIDE", "get").mockReturnValue(biome);
+    this.log(`Starting biome set to ${Biome[biome]} (=${biome})!`);
+  }
+
+  /**
+   * Set the starting wave (index)
+   *
+   * @param wave the wave (index) to set. Classic: `1`-`200`
+   */
+  startingWave(wave: number) {
+    vi.spyOn(Overrides, "STARTING_WAVE_OVERRIDE", "get").mockReturnValue(wave);
+    this.log(`Starting wave set to ${wave}!`);
+  }
+
+  private log(...params: any[]) {
+    console.log("Overrides:", ...params);
+  }
+}