code: def export() -> None:
      node = onnx.helper.make_node(
          "StringConcat",
          inputs=["x", "y"],
          outputs=["result"],
      )
      x = np.array(["abc", "def"]).astype("object")
      y = np.array([".com", ".net"]).astype("object")
      result = np.array(["abc.com", "def.net"]).astype("object")
  
      expect(
          node,
          inputs=[x, y],
          outputs=[result],
          name="test_string_concat",
      )
  
      x = np.array(["cat", "dog", "snake"]).astype("object")
      y = np.array(["s"]).astype("object")
      result = np.array(["cats", "dogs", "snakes"]).astype("object")
  
      expect(
          node,
          inputs=[x, y],
          outputs=[result],
          name="test_string_concat_broadcasting",
      )
  
      x = np.array("cat").astype("object")
      y = np.array("s").astype("object")
      result = np.array("cats").astype("object")
  
      expect(
          node,
          inputs=[x, y],
          outputs=[result],
          name="test_string_concat_zero_dimensional",
      )
  
      x = np.array(["abc", ""]).astype("object")
      y = np.array(["", "abc"]).astype("object")
      result = np.array(["abc", "abc"]).astype("object")
  
      expect(
          node,
          inputs=[x, y],
          outputs=[result],
          name="test_string_concat_empty_string",
      )
  
      x = np.array(["的", "中"]).astype("object")
      y = np.array(["的", "中"]).astype("object")
      result = np.array(["的的", "中中"]).astype("object")
  
      expect(
          node,
          inputs=[x, y],
          outputs=[result],
          name="test_string_concat_utf8",
      )
  
imports: import numpy
  import onnx
  from onnx.backend.test.case.base import Base
  from onnx.backend.test.case.node import expect
label_desc: Use image node_id 1 for calling the StringConcat obj's underlying member method code with example usage: obj.export() without return types