diff --git a/.env.example b/.env.example
index 3e1f322..1dc2bde 100644
--- a/.env.example
+++ b/.env.example
@@ -2,9 +2,9 @@ ACTUAL_BUDGET_ID=your-budget-id
 ACTUAL_SYNC_ID=your-sync-id
 ACTUAL_SERVER_URL=your-server-url
 ACTUAL_PASSWORD=your-password
-# Sparebank1
-SPAREBANK1_OAUTH_CLIENT_ID=your-client-id
-SPAREBANK1_OAUTH_CLIENT_SECRET=your-client-secret
-SPAREBANK1_OAUTH_STATE=your-state
-SPAREBANK1_OAUTH_REDIRECT_URI=your-redirect-uri
+# Bank
+BANK_OAUTH_CLIENT_ID=your-client-id
+BANK_OAUTH_CLIENT_SECRET=your-client-secret
+BANK_OAUTH_STATE=your-state
+BANK_OAUTH_REDIRECT_URI=your-redirect-uri
 BANK_ACCOUNT_IDS=your-account-id1,your-account-id2
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 846e966..a708518 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,7 +12,7 @@ lerna-debug.log*
 
 # Caches
 
-data/cache/*
+.cache
 
 # Diagnostic reports (https://nodejs.org/api/report.html)
 
diff --git a/config.ts b/config.ts
index 30a6589..a704e30 100644
--- a/config.ts
+++ b/config.ts
@@ -7,19 +7,13 @@ export const ACTUAL_BUDGET_ID = getOrThrow("ACTUAL_BUDGET_ID")
 export const ACTUAL_SYNC_ID = getOrThrow("ACTUAL_SYNC_ID")
 export const ACTUAL_SERVER_URL = getOrThrow("ACTUAL_SERVER_URL")
 export const ACTUAL_PASSWORD = getOrThrow("ACTUAL_PASSWORD")
-export const ACTUAL_DATA_DIR = "data/cache"
 export const ACTUAL_ACCOUNT_IDS = getArrayOrThrow("ACTUAL_ACCOUNT_IDS")
+export const ACTUAL_DATA_DIR = ".cache"
 
-export const SPAREBANK1_OAUTH_CLIENT_ID = getOrThrow(
-  "SPAREBANK1_OAUTH_CLIENT_ID",
-)
-export const SPAREBANK1_OAUTH_CLIENT_SECRET = getOrThrow(
-  "SPAREBANK1_OAUTH_CLIENT_SECRET",
-)
-export const SPAREBANK1_OAUTH_REDIRECT_URI = getOrThrow(
-  "SPAREBANK1_OAUTH_REDIRECT_URI",
-)
-export const SPAREBANK1_OAUTH_STATE = getOrThrow("SPAREBANK1_OAUTH_STATE")
+export const BANK_OAUTH_CLIENT_ID = getOrThrow("BANK_OAUTH_CLIENT_ID")
+export const BANK_OAUTH_CLIENT_SECRET = getOrThrow("BANK_OAUTH_CLIENT_SECRET")
+export const BANK_OAUTH_REDIRECT_URI = getOrThrow("BANK_OAUTH_REDIRECT_URI")
+export const BANK_OAUTH_STATE = getOrThrow("BANK_OAUTH_STATE")
 export const BANK_ACCOUNT_IDS = getArrayOrThrow("BANK_ACCOUNT_IDS")
 
 function getOrThrow(key: string): string {
diff --git a/package.json b/package.json
index ad86c6c..0c63f62 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "start": "node --import=tsx ./src/main.ts | pino-pretty",
-    "test": "echo \"Error: no test specified\" && exit 1",
+    "test": "node --test --experimental-strip-types ./tests/**",
     "format": "prettier --write \"./**/*.{js,mjs,ts,md,json}\""
   },
   "keywords": [],
diff --git a/src/actual.ts b/src/actual.ts
index cf232e4..fc17dd4 100644
--- a/src/actual.ts
+++ b/src/actual.ts
@@ -3,7 +3,6 @@ import {
   ACTUAL_DATA_DIR,
   ACTUAL_PASSWORD,
   ACTUAL_SERVER_URL,
-  ACTUAL_SYNC_ID,
 } from "../config.ts"
 import type { TransactionEntity } from "@actual-app/api/@types/loot-core/types/models"
 import { type UUID } from "node:crypto"
@@ -53,28 +52,3 @@ export class ActualImpl implements Actual {
     return await actual.shutdown()
   }
 }
-
-export async function init() {
-  return await actual.init({
-    // Budget data will be cached locally here, in subdirectories for each file.
-    dataDir: ACTUAL_DATA_DIR,
-    // This is the URL of your running server
-    serverURL: ACTUAL_SERVER_URL,
-    // This is the password you use to log into the server
-    password: ACTUAL_PASSWORD,
-  })
-}
-
-export async function downloadBudget() {
-  const something = await actual.downloadBudget(ACTUAL_SYNC_ID)
-  console.log("downloadBudget", something)
-  return something
-}
-
-export async function getAccounts() {
-  return await actual.getAccounts()
-}
-
-export async function shutdown() {
-  await actual.shutdown()
-}
diff --git a/src/main.ts b/src/main.ts
index c45a0f9..bea417c 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,14 +1,15 @@
 import { type Actual, ActualImpl } from "@/actual.ts"
 import { cronJobDaily } from "@/cron.ts"
 import { type Bank, Sparebank1Impl, type Transaction } from "@/sparebank1.ts"
-import { transactionIntoActualTransaction } from "@/mappings.ts"
+import { bankTransactionIntoActualTransaction } from "@/mappings.ts"
 import { ACTUAL_ACCOUNT_IDS, BANK_ACCOUNT_IDS } from "../config.ts"
 import logger from "pino"
 import type { UUID } from "node:crypto"
 
 // TODO Transports api for pino https://github.com/pinojs/pino/blob/HEAD/docs/transports.md
+// TODO create .cache if missing
 
-async function daily(actual: Actual, bank: Bank): Promise<void> {
+export async function daily(actual: Actual, bank: Bank): Promise<void> {
   // Fetch transactions from the bank
   const transactions = await fetchTransactionsFromPastDay(bank)
   logger().info(`Fetched ${transactions.length} transactions`)
@@ -16,12 +17,14 @@ async function daily(actual: Actual, bank: Bank): Promise<void> {
   // TODO multiple accounts
   const accountId = ACTUAL_ACCOUNT_IDS[0] as UUID
   const actualTransactions = transactions.map((transaction) =>
-    transactionIntoActualTransaction(transaction, accountId),
+    bankTransactionIntoActualTransaction(transaction, accountId),
   )
 
   // TODO Import transactions into Actual
   //  If multiple accounts, loop over them
   //  Get account ID from mapper
+
+  // TODO TypeError: Cannot read properties of undefined (reading 'timestamp')
   await actual.importTransactions(accountId, actualTransactions)
 }
 
@@ -36,12 +39,15 @@ async function fetchTransactionsFromPastDay(
 async function main(): Promise<void> {
   logger().info("Starting application")
   const actual = await ActualImpl.init()
+  logger().info("Initialized Actual Budget API")
+
   cronJobDaily(async () => {
     logger().info("Running daily job")
     await daily(actual, new Sparebank1Impl())
     logger().info("Finished daily job")
   })
-  logger().info("Shutting down")
+
+  // logger().info("Shutting down")
   // await actual.shutdown()
 }
 
diff --git a/src/mappings.ts b/src/mappings.ts
index 2d7a88f..4656356 100644
--- a/src/mappings.ts
+++ b/src/mappings.ts
@@ -3,14 +3,17 @@ import type { TransactionEntity } from "@actual-app/api/@types/loot-core/types/m
 import type { UUID } from "node:crypto"
 
 // TODO more fields / correct fields?
-export function transactionIntoActualTransaction(
+export function bankTransactionIntoActualTransaction(
   transaction: Transaction,
   accountId: UUID,
 ): TransactionEntity {
   return {
     id: transaction.id,
+    // Transactions with the same id will be ignored
+    imported_id: transaction.id,
     account: accountId,
-    amount: transaction.amount,
+    // The value without decimals
+    amount: transaction.amount * 100,
     date: transaction.date,
     payee: transaction.description,
   }
diff --git a/tests/main.test.ts b/tests/main.test.ts
new file mode 100644
index 0000000..2da1d5f
--- /dev/null
+++ b/tests/main.test.ts
@@ -0,0 +1,12 @@
+import { describe, it } from "node:test"
+import { daily } from "@/main.ts"
+import { ActualImpl } from "@/actual.ts"
+import { BankStub } from "./stubs/bankStub.ts"
+import assert from "node:assert"
+
+describe("Main logic of the application", () => {
+  it("should import the transactions to Actual Budget", async () => {
+    await daily(await ActualImpl.init(), new BankStub())
+    assert.ok(true)
+  })
+})
diff --git a/tests/stubs/bankStub.ts b/tests/stubs/bankStub.ts
new file mode 100644
index 0000000..d782bd3
--- /dev/null
+++ b/tests/stubs/bankStub.ts
@@ -0,0 +1,49 @@
+import type { Bank, OAuthTokenResponse, Transaction } from "@/sparebank1.ts"
+
+const tokenResponse: OAuthTokenResponse = {
+  access_token: "my_access_token",
+  token_type: "Bearer",
+  expires_in: 3600,
+  refresh_token: "my_refresh_token",
+  refresh_token_expires_in: 3600,
+  refresh_token_absolute_expires_in: 3600,
+}
+
+export class BankStub implements Bank {
+  async accessToken(): Promise<OAuthTokenResponse> {
+    return tokenResponse
+  }
+
+  async refreshToken(_unused: string): Promise<OAuthTokenResponse> {
+    return tokenResponse
+  }
+
+  async transactionsPastDay(
+    _accountIds: ReadonlyArray<string> | string,
+    _accessToken: string,
+  ): Promise<ReadonlyArray<Transaction>> {
+    const someFields = {
+      date: new Date().toDateString(),
+      description: "Test transaction",
+      cleanedDescription: "Test transaction",
+      remoteAccountName: "Test account",
+    }
+    return [
+      {
+        id: "1",
+        amount: 100,
+        ...someFields,
+      },
+      {
+        id: "2",
+        amount: 200,
+        ...someFields,
+      },
+      {
+        id: "3",
+        amount: -50,
+        ...someFields,
+      },
+    ]
+  }
+}