chore: import upstream snapshot with attribution

haystack/testing/sample_components/concatenate.py

@@ -0,0 +1,29 @@
+# SPDX-FileCopyrightText: 2022-present deepset GmbH <info@deepset.ai>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+from haystack.core.component import component
+
+
+@component
+class Concatenate:
+    """
+    Concatenates two values
+    """
+
+    @component.output_types(value=list[str])
+    def run(self, first: list[str] | str, second: list[str] | str):
+        """
+        Concatenates two values
+        """
+        if isinstance(first, str) and isinstance(second, str):
+            res = [first, second]
+        elif isinstance(first, list) and isinstance(second, list):
+            res = first + second
+        elif isinstance(first, list) and isinstance(second, str):
+            res = first + [second]
+        elif isinstance(first, str) and isinstance(second, list):
+            res = [first] + second
+        else:
+            res = None
+        return {"value": res}