class_docstr: Test case of valid pipeline interface 
class_docstr_tok: ["Test","case","of","valid","pipeline","interface"]
docstr: target: test pipeline for image normal case
  method:  call pipeline with right pipeline name
  expected: return object
docstr_tok: ["target",":","test","pipeline","for","image","normal","case","method",":","call","pipeline","with","right","pipeline","name","expected",":","return","object"]
code: def test_pipeline(self, pipeline_name):
      """
      target: test pipeline for image normal case
      method:  call pipeline with right pipeline name
      expected: return object
      """
      embedding_pipeline = pipeline(pipeline_name)
      assert "_pipeline" in dir(embedding_pipeline)
  
imports: from towhee import pipeline
label_desc: Use image node_id 1 for calling the TestPipelineValid obj's underlying member method code with example usage: obj.test_pipeline(pipeline_name) without return types