feat(medusa): Cache modules (#3187)

packages/cache-redis/src/services/__tests__/redis-cache.js

@@ -0,0 +1,29 @@
+import { RedisCacheService } from "../index"
+
+const redisClientMock = {
+  set: jest.fn(),
+  get: jest.fn(),
+}
+
+describe("RedisCacheService", () => {
+  let cacheService
+
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  it("Underlying client methods are called", async () => {
+    cacheService = new RedisCacheService(
+      {
+        cacheRedisConnection: redisClientMock,
+      },
+      {}
+    )
+
+    await cacheService.set("test-key", "value")
+    expect(redisClientMock.set).toBeCalled()
+
+    await cacheService.get("test-key")
+    expect(redisClientMock.get).toBeCalled()
+  })
+})