old_contents: import re
  import unittest
  
  from test_utils import import_utils
  import_utils.prepare_lldb_import_or_exit()
  
  import lldb
  
  import_utils.prepare_for_scripts_imports()
  
  from scripts import print_view_controller_hierarchy
  
  class PrintViewControllerHierarchyTest(unittest.TestCase):
    def testPrintViewControllerHierarchy(self):
      debugger = lldb.SBDebugger.Create()
      debugger.SetAsync(False)
      target = debugger.CreateTarget('')
      error = lldb.SBError()
      process = target.AttachToProcessWithName(debugger.GetListener(), 'TestApp',
                                               False, error)
      if not process:
        self.assertTrue(False, 'Could not attach to process "TestApp"')
      debugger.SetSelectedTarget(target)
      result = lldb.SBCommandReturnObject()
      print_view_controller_hierarchy.print_view_controller_hierarchy(debugger,
                                                                      None,
                                                                      result,
                                                                      None)
      self.assertTrue(result.Succeeded())
      expected_output_regex =  r'<ViewController 0x\w{12}>, state: appeared, view: <UIView 0x\w{12}>'
      self.assertTrue(re.match(expected_output_regex,
                      result.GetOutput().rstrip()))
      debugger.Terminate()
  
new_contents: """Tests for scripts/print_view_controller_hierarchy.py."""
  import re
  import unittest
  
  from test_utils import import_utils
  import_utils.prepare_lldb_import_or_exit()
  
  import lldb
  
  import_utils.prepare_for_scripts_imports()
  
  from scripts import print_view_controller_hierarchy
  
  class PrintViewControllerHierarchyTest(unittest.TestCase):
    def testPrintViewControllerHierarchy(self):
      """Tests the expected output of the |pvc| command."""
      debugger = lldb.SBDebugger.Create()
      debugger.SetAsync(False)
      target = debugger.CreateTarget('')
      error = lldb.SBError()
      process = target.AttachToProcessWithName(debugger.GetListener(), 'TestApp',
                                               False, error)
      if not process:
        self.assertTrue(False, 'Could not attach to process "TestApp"')
      debugger.SetSelectedTarget(target)
      result = lldb.SBCommandReturnObject()
      print_view_controller_hierarchy.print_view_controller_hierarchy(debugger,
                                                                      None,
                                                                      result,
                                                                      None)
      self.assertTrue(result.Succeeded())
      expected_output_regex =  r'<ViewController 0x\w{12}>, state: appeared, view: <UIView 0x\w{12}>'
      self.assertTrue(re.match(expected_output_regex,
                      result.GetOutput().rstrip()))
      debugger.Terminate()
  
subject: Add some basic comments to print_view_controller_hierarchy_test.py.