diff --git a/tests/router.py b/tests/router.py
new file mode 100644
index 0000000000000000000000000000000000000000..f9ef8254b092c461827ccecfd6b37e5e98f2ec6a
--- /dev/null
+++ b/tests/router.py
@@ -0,0 +1,17 @@
+
+import unittest
+
+from my_sum import sum
+
+
+class TestSum(unittest.TestCase):
+    def test_list_int(self):
+        """
+        Test that it can sum a list of integers
+        """
+        data = [1, 2, 3]
+        result = sum(data)
+        self.assertEqual(result, 6)
+
+if __name__ == '__main__':
+    unittest.main()