new_contents: """Tests for scripts/print_view_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_hierarchy
  
  class PrintViewHierarchyTest(unittest.TestCase):
    def testPrintViewHierarchy(self):
      """Tests the expected output of the |pv| 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_hierarchy.print_view_hierarchy(debugger, None, result, None)
      self.assertTrue(result.Succeeded())
      expected_output_regex =  r'<UIWindow: 0x\w{12}; frame = \(0 0; 414 736\); autoresize = W\+H; gestureRecognizers = <NSArray: 0x\w{12}>; layer = <UIWindowLayer: 0x\w{12}>>\n   \|'
      self.assertTrue(re.search(expected_output_regex, result.GetOutput(), re.M))
      debugger.DeleteTarget(target)
  
subject: Add a test for |pv| command.