diff --git a/Git/exercises/ejercicio_1/src/__init__.py b/Git/exercises/ejercicio_1/src/__init__.py
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+def sum(arg):
+    total = 0
+    for val in arg:
+        total += val
+    return total
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diff --git a/Git/exercises/ejercicio_1/tests/test.py b/Git/exercises/ejercicio_1/tests/test.py
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+++ b/Git/exercises/ejercicio_1/tests/test.py
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+import unittest
+
+from src 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()
diff --git a/Git/exercises/ejercicio_1/tests/test2.py b/Git/exercises/ejercicio_1/tests/test2.py
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+++ b/Git/exercises/ejercicio_1/tests/test2.py
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+import unittest
+
+from src import sum
+
+
+class TestSum(unittest.TestCase):
+    def test_list_int(self):
+        """
+        Test that it can sum a list of integers
+        """
+        data = [1, 32, 3]
+        result = sum(data)
+        self.assertEqual(result, 36)
+
+
+if __name__ == "__main__":
+    unittest.main()