code: def test_input_strings():
      component = Concatenate()
      res = component.run(first="This", second="That")
      assert res == {"value": ["This", "That"]}
  
imports: from haystack.testing.sample_components import Concatenate
  from haystack.core.serialization import component_to_dict, component_from_dict
label_desc: Use image node_id 2 for calling a global function with example usage: test_input_strings() without return types