code: def test_keras_imports():
      try:
          # Ensures packages from all backends are installed.
          # Builds Keras core package and returns package file path.
          whl_path = setup_package()
  
          # Creates and activates a virtual environment.
          create_virtualenv()
  
          # Ensures the backend's package is installed
          # and the other backends are uninstalled.
          manage_venv_installs(whl_path)
  
          # Runs test of basic flow in Keras Core.
          # Tests for backend-specific imports and `model.fit()`.
          run_keras_flow()
  
          # Removes virtual environment and associated files
      finally:
          cleanup()
  
file_path: keras/integration_tests/import_test.py
imports: import os
  import re
  import subprocess
  from keras import backend
label_desc: Use image node_id 8 for calling a global function with example usage: test_keras_imports() without return types