code: def test_find_pipeline_input_no_input():
      pipe = Pipeline()
      pipe.add_component("comp1", Double())
      pipe.add_component("comp2", Double())
      pipe.connect("comp1", "comp2")
      pipe.connect("comp2", "comp1")
  
      assert find_pipeline_inputs(pipe.graph) == {
          "comp1": [],
          "comp2": [],
      }
  
imports: from typing import Optional
  import pytest
  from haystack.core.pipeline import Pipeline
  from haystack.core.component.types import Variadic
  from haystack.core.errors import PipelineValidationError
  from haystack.core.component.sockets import InputSocket, OutputSocket
  from haystack.core.pipeline.descriptions import find_pipeline_inputs, find_pipeline_outputs
  from haystack.testing.sample_components import Double, AddFixedValue, Sum, Parity
label_desc: Use image node_id 1 for calling a global function with example usage: test_find_pipeline_input_no_input() without return types