diff --git a/src/repositories/parking/__tests__/ParkingRepositorySharedTests.test.ts b/src/repositories/parking/__tests__/ParkingRepositorySharedTests.test.ts
index feabfa1..426ab9d 100644
--- a/src/repositories/parking/__tests__/ParkingRepositorySharedTests.test.ts
+++ b/src/repositories/parking/__tests__/ParkingRepositorySharedTests.test.ts
@@ -4,14 +4,9 @@ import { IParkingStructure } from "../../../entities/ParkingRepositoryEntities";
 import { ParkingGetterSetterRepository } from "../ParkingGetterSetterRepository";
 import { RedisParkingRepository } from "../RedisParkingRepository";
 import { HistoricalParkingAverageFilterArguments } from "../ParkingGetterRepository";
+import { RepositoryHolder } from "../../../../testHelpers/RepositoryHolder";
 
-interface RepositoryHolder {
-  name: string;
-  factory(): Promise<ParkingGetterSetterRepository>;
-  teardown(): Promise<void>;
-}
-
-class InMemoryParkingRepositoryHolder implements RepositoryHolder {
+class InMemoryParkingRepositoryHolder implements RepositoryHolder<ParkingGetterSetterRepository> {
   name = 'InMemoryParkingRepository';
   factory = async () => {
     return new InMemoryParkingRepository();
@@ -19,7 +14,7 @@ class InMemoryParkingRepositoryHolder implements RepositoryHolder {
   teardown = async () => {};
 }
 
-class RedisParkingRepositoryHolder implements RepositoryHolder {
+class RedisParkingRepositoryHolder implements RepositoryHolder<ParkingGetterSetterRepository> {
   repo: RedisParkingRepository | undefined;
 
   name = 'RedisParkingRepository';
diff --git a/src/repositories/shuttle/__tests__/ShuttleRepositorySharedTests.test.ts b/src/repositories/shuttle/__tests__/ShuttleRepositorySharedTests.test.ts
index 200384e..a6f2c27 100644
--- a/src/repositories/shuttle/__tests__/ShuttleRepositorySharedTests.test.ts
+++ b/src/repositories/shuttle/__tests__/ShuttleRepositorySharedTests.test.ts
@@ -11,14 +11,9 @@ import {
   generateMockShuttles,
   generateMockStops,
 } from "../../../../testHelpers/mockDataGenerators";
+import { RepositoryHolder } from "../../../../testHelpers/RepositoryHolder";
 
-interface RepositoryHolder {
-  name: string;
-  factory(): Promise<ShuttleGetterSetterRepository>;
-  teardown(): Promise<void>;
-}
-
-class UnoptimizedInMemoryShuttleRepositoryHolder implements RepositoryHolder {
+class UnoptimizedInMemoryShuttleRepositoryHolder implements RepositoryHolder<ShuttleGetterSetterRepository> {
   name = 'UnoptimizedInMemoryShuttleRepository';
   factory = async () => {
     return new UnoptimizedInMemoryShuttleRepository();
@@ -26,7 +21,7 @@ class UnoptimizedInMemoryShuttleRepositoryHolder implements RepositoryHolder {
   teardown = async () => {};
 }
 
-class RedisShuttleRepositoryHolder implements RepositoryHolder {
+class RedisShuttleRepositoryHolder implements RepositoryHolder<ShuttleGetterSetterRepository> {
   repo: RedisShuttleRepository | undefined;
 
   name = 'RedisShuttleRepository';
diff --git a/testHelpers/RepositoryHolder.ts b/testHelpers/RepositoryHolder.ts
new file mode 100644
index 0000000..4871993
--- /dev/null
+++ b/testHelpers/RepositoryHolder.ts
@@ -0,0 +1,5 @@
+export interface RepositoryHolder<T> {
+  name: string;
+  factory(): Promise<T>;
+  teardown(): Promise<void>;
+}