diff --git a/src/helpers/storage.test.ts b/src/helpers/storage.test.ts
new file mode 100644
index 0000000..81bfb8d
--- /dev/null
+++ b/src/helpers/storage.test.ts
@@ -0,0 +1,62 @@
+process.env.DATABASE = ':memory:'
+import { beforeAll, expect, test } from '@jest/globals'
+import {
+  createMembership,
+  getAccessToken,
+  getMapping,
+  getMemberships,
+  initStorage,
+  save,
+} from './storage'
+import { IdMapping } from '../entity/IdMapping'
+import { Membership } from '../entity/Membership'
+
+const mapping = new IdMapping()
+mapping.rcId = 'rcId'
+mapping.matrixId = 'matrixId'
+mapping.type = 0
+mapping.accessToken = 'accessToken'
+
+const membership = new Membership()
+membership.rcRoomId = 'rcRoomId'
+membership.rcUserId = 'rcUserId'
+
+beforeAll(async () => {
+  await initStorage()
+})
+
+test('save mapping', async () => {
+  await expect(save(mapping)).resolves.toBe(undefined)
+})
+
+test('get mapping', async () => {
+  await expect(getMapping(mapping.rcId, mapping.type)).resolves.toStrictEqual(
+    mapping
+  )
+  await expect(getMapping('inexistent', 0)).resolves.toBe(null)
+})
+
+test('get access token', async () => {
+  await expect(getAccessToken(mapping.rcId)).resolves.toBe(mapping.accessToken)
+  await expect(getAccessToken('inexistent')).resolves.toBe(undefined)
+})
+
+test('create membership', async () => {
+  await expect(
+    createMembership(membership.rcRoomId, membership.rcUserId)
+  ).resolves.toBe(undefined)
+})
+
+test('get membership', async () => {
+  await expect(getMemberships(membership.rcRoomId)).resolves.toStrictEqual([
+    membership.rcUserId,
+  ])
+
+  await createMembership(membership.rcRoomId, 'secondMember')
+  await expect(getMemberships(membership.rcRoomId)).resolves.toStrictEqual([
+    membership.rcUserId,
+    'secondMember',
+  ])
+
+  await expect(getMemberships('inexistent')).resolves.toStrictEqual([])
+})
diff --git a/src/helpers/storage.ts b/src/helpers/storage.ts
index 961de7a..fcd9ff8 100644
--- a/src/helpers/storage.ts
+++ b/src/helpers/storage.ts
@@ -4,7 +4,7 @@ import { Membership } from '../entity/Membership'
 
 const AppDataSource = new DataSource({
   type: 'sqlite',
-  database: 'db.sqlite',
+  database: process.env.DATABASE || 'db.sqlite',
   entities: [IdMapping, Membership],
   synchronize: true,
   logging: false,