chore: import upstream snapshot with attribution

test/core/sample_components/test_sum.py

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2022-present deepset GmbH <info@deepset.ai>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+from haystack.testing.sample_components import Sum
+
+
+def test_sum_receives_no_values():
+    component = Sum()
+    results = component.run(values=[])
+    assert results == {"total": 0}
+
+
+def test_sum_receives_one_value():
+    component = Sum()
+    assert component.run(values=[10]) == {"total": 10}
+
+
+def test_sum_receives_few_values():
+    component = Sum()
+    assert component.run(values=[10, 2]) == {"total": 12}