diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..91abb11
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "pip" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/verify-script.yml b/.github/workflows/verify-script.yml
new file mode 100644
index 0000000..4f2f7c6
--- /dev/null
+++ b/.github/workflows/verify-script.yml
@@ -0,0 +1,28 @@
+name: Verify Script
+
+on: [push,workflow_dispatch,pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ "3.10", "3.11" ]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+    - name: Analysing the code with pylint
+      run: |
+        pylint --errors-only $(find src/ -name "*.py" | xargs)
+    - name: Running tests
+      run: |
+        python -m unittest
diff --git a/README.md b/README.md
index 486ccd7..7ca088f 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # MoneyMoney Extension: Sum by Bank
 
-This is a Pyton script for the great [MoneyMoney software](https://moneymoney-app.com/) to generate a list with all balances by bank account.  
+![build status](https://github.com/ma4nn/moneymoney-sum-by-bank/actions/workflows/verify-script.yml/badge.svg)
+
+This is a Python script for the great [MoneyMoney software](https://moneymoney-app.com/) to generate a list with all balances by bank account.  
 This is useful e.g. to export the total values per bank to a summary Excel document or to monitor certain threshold values per bank.
 
 ## Installation
diff --git a/moneymoney_api.py b/moneymoney_api.py
index 615b977..cfb6019 100644
--- a/moneymoney_api.py
+++ b/moneymoney_api.py
@@ -13,7 +13,7 @@
 class Account(TypedDict):
     name: str
     bankCode: str
-    balance: list[float | str]
+    balance: list[list[float | str]]
     portfolio: bool
     group: bool
     attributes: dict[str, str]
diff --git a/test_moneymoney_sum_by_bank.py b/test_moneymoney_sum_by_bank.py
new file mode 100644
index 0000000..3935a46
--- /dev/null
+++ b/test_moneymoney_sum_by_bank.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""
+    Unit Tests
+"""
+
+import unittest
+import pandas as pd
+from pandas.testing import assert_frame_equal
+from moneymoney_api import Account
+from moneymoney_sum_by_bank import sum_by_account
+
+
+class TestSumByBank(unittest.TestCase):
+
+    def test_empty(self):
+        df = sum_by_account([])
+
+        assert df.empty is True
+
+    def test_single_account(self):
+        accounts: list[Account] = [
+            Account(name='Test Bank A', balance=[[1000.00, 'EUR']], portfolio=False, group=False, bankCode='TES1')
+        ]
+
+        df_expected = pd.DataFrame([{'bank': 'TES1', 'currency': 'EUR', 'balance': 1000.00}]).set_index(['bank', 'currency'])
+        df = sum_by_account(accounts)
+
+        assert_frame_equal(df_expected, df, check_exact=True)
+
+    def test_single_account_no_bank_code(self):
+        accounts: list[Account] = [
+            Account(name='Test Bank A', balance=[[1000.00, 'EUR']], portfolio=False, group=False, bankCode='', attributes={'bankIdentifier': 'TES1'})
+        ]
+
+        df_expected = pd.DataFrame([{'bank': 'TES1', 'currency': 'EUR', 'balance': 1000.00}]).set_index(['bank', 'currency'])
+        df = sum_by_account(accounts)
+
+        assert_frame_equal(df_expected, df, check_exact=True)
+
+    def test_multi_accounts_same_bank(self):
+        accounts: list[Account] = [
+            Account(name='Test Bank A', balance=[[1000.00, 'EUR']], portfolio=False, group=False, bankCode='TES1'),
+            Account(name='Test Bank A', balance=[[490.18, 'EUR']], portfolio=False, group=False, bankCode='TES1')
+        ]
+
+        df_expected = pd.DataFrame([{'bank': 'TES1', 'currency': 'EUR', 'balance': 1490.18}]).set_index(['bank', 'currency'])
+        df = sum_by_account(accounts)
+
+        assert_frame_equal(df_expected, df, check_exact=True)
+
+    def test_multi_accounts(self):
+        accounts: list[Account] = [
+            Account(name='Test Bank A', balance=[[1000.00, 'EUR']], portfolio=False, group=False, bankCode='TES1'),
+            Account(name='Test Bank A', balance=[[490.18, 'EUR']], portfolio=False, group=False, bankCode='TES1IGNORED'),
+            Account(name='Test Bank B', balance=[[0.99, 'EUR']], portfolio=False, group=False, bankCode='TES2'),
+            Account(name='Test Bank C', balance=[[0, 'EUR']], portfolio=False, group=False, bankCode='TES3'),
+            Account(name='Test Bank B', balance=[[0.9988, 'EUR']], portfolio=False, group=False, bankCode='TES2')
+        ]
+
+        df_expected = pd.DataFrame([{'bank': 'TES1', 'currency': 'EUR', 'balance': 1490.18}, {'bank': 'TES2', 'currency': 'EUR', 'balance': 1.9888}, {'bank': 'TES3', 'currency': 'EUR', 'balance': 0}]).set_index(['bank', 'currency'])
+        df = sum_by_account(accounts)
+
+        assert_frame_equal(df_expected, df, check_exact=True)